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5 reasons air pollution is everyone’s problem.

From contaminating our environment to damaging our health, poor air quality is a major global challenge. No one is immune to the negative effects of air pollution, but many think this shared burden doesn’t affect their lives.

Clean air is everyone’s business and air pollution is preventable. The solutions to this pressing issue are also key to tackling the climate crisis, fostering inclusive societies and improving childhood development. By working together, we have a golden opportunity to transform our approach to one of the great hidden killers.

Here are five reasons clean air is everyone’s business from our latest report, as well as recommendations for funders and campaigners.

1. Reducing air pollution would limit global warming

Not only do air pollutants and greenhouse gases share the same sources, some pollutants directly contribute to global warming. Reducing these pollutants (called Short-Lived Climate Pollutants) would slow the rate of climate change and help limit warming to 1.5C.

2. Air pollution is bad for our health

Even though you can’t see it, the air you are breathing is probably polluted. Worldwide, 9 out of 10 of us breathe air that is damaging our health. Invisible particles penetrate every cell and organ in our bodies, causing acute and chronic diseases, including asthma, strokes, heart attacks and dementia. Outdoor air pollution causes around 4.2 million early deaths every year.

3. Dirty air is detrimental to childhoods

Our children, and all future generations, deserve to breathe air that is free from toxic pollution. 93% of children under 15 are denied their right to grow up in a clean and healthy environment. Many babies breathe polluted air from their first breath, a critical period when the foundations of growth and cognitive development are being established. Air pollution negatively impacts a child’s physical health, their right to an education and to play. These factors are detrimental to brain development, and contribute to mental health and behavioural issues.

4. The most marginalised are hit the hardest

The worst effects of air pollution are often felt by those least responsible. The poorest and most marginalised communities are most likely to live in congested neighbourhoods or work where they are exposed to toxic levels of pollution. The impact on their health prevents them from attending school or work, which further exacerbates poverty and inequity.

5. Our cities should be liveable and sustainable

Throughout the world, many cities prioritise the movement of cars over people. By 2050, 68% of the world’s population is projected to live in urban areas. However, only half of the world’s urban population has convenient access to public transport. How our cities are designed and, consequently, how we travel, determines the quality of air we breathe, as well as our health, safety and wellbeing as city dwellers.

What funders and campaigners can do

Action on air pollution can address some of our biggest problems at the same time and will pay for itself many times over. Clean air is a critical but unacknowledged secret weapon to achieving the Sustainable Development Goals and building a fairer, greener future. Here are six ways funders and campaigners can contribute to this effort:

• Develop internal knowledge and strengthen your team’s understanding of the benefits of clean air.
• Build and diversify demand for clean air by discussing how clean air benefits your work in your communications, advocacy and campaigning.
• Support the delivery of clean air by applying your issue-specific expertise to the problem.
• Use data and evidence on air pollution to understand the impact of air pollution on your work and vice-versa.
• Engage with the communities you serve to build alliances with the groups that are most affected.
• Help make the case for more efficient funding and projects that address several development goals together.

Read our new publication, Clean Air is Everyone’s Business , for more on the benefits of tackling air pollution, and get suggestions on incorporating clean air into funders’ and campaigners’ work.

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How air pollution is destroying our health

WHO data show that almost all of the global population (99%) breathe air that exceeds WHO  guideline limits  and contains high levels of  pollutants , with low- and middle-income countries (LMIC) suffering from the highest exposures.

Ambient (outdoor) air pollution in both cities and rural areas is causing fine particulate matter which results in strokes, heart diseases, lung cancer, and acute and chronic respiratory diseases.  

Additionally, around 2.6 billion people are exposed to dangerous levels of household air pollution from using polluting open fires or simple stoves for cooking fuelled by kerosene, biomass (wood, animal dung and crop waste) and coal.

First Global Conference on Air Pollution and Health

To rally the world towards major commitments to fight this problem, WHO and partners convened the first  Global Conference on Air Pollution and Health  in Geneva on 29 October – 1 November 2018. The conference raised awareness of this growing public health challenge and shared information and tools on the health risks of air pollution and its interventions.

This conference showcased some of WHO’s work on air pollution, including the findings of its Global Platform on Air Quality and Health. This platform, whose diverse membership includes researchers, civil society, UN agencies and other partner institutions, reviewed the data on air quality and health. For example, the platform worked on techniques to more accurately attribute air pollution coming from different sources of pollution. Ongoing work includes improving estimates of air quality by combining the data from various air quality monitoring networks, atmospheric modelling and satellite remote sensing.

Health impacts of air pollution

There are two main types of air pollution: ambient air pollution (outdoor pollution) and household air pollution (indoor air pollution). Ambient air pollution is a major environmental health problem affecting everyone in low-, middle-, and high-income countries as its source – combustion of fossil fuel – is ubiquitous. Household air pollution is mainly caused by the use of solid fuels (such as wood, crop wastes, charcoal, coal and dung) and kerosene in open fires and inefficient stoves. Most of these people are poor and live in low- and middle-income countries.

Exposure to smoke from cooking fires causes 3.2 million premature deaths each year, mostly in low- and middle-income countries, where polluting fuels and technologies are used every day, particularly at home for cooking, heating and lighting. Women and children, who tend to spend more time indoors, are affected the most. LMIC also suffer the greatest from exposure ambient air pollution with 3.68 million premature deaths each year, which is almost 8 times the mortality rates in high income countries (0.47 million).

The main pollutants are:

-  particulate matter, a mix of solid and liquid droplets, with larger particles (PM 10 ) arising from pollen, sea spray and wind-blown dust from erosion, agricultural spaces, roadways and mining operations, while finer particles (PM2.5) can be derived from primary sources (for example combustion of fuels in power generation facilities, industries or vehicles) and secondary sources (for example chemical reactions between gases)

-  nitrogen dioxide (NO 2 ), a gas from combustion of fuels in processes such as those used for furnaces, gas stoves, transportation, industry and power generation;

-  sulfur dioxide, another gas mainly from the combustion of fossil fuels for domestic heating, industries and power generation; and

-  ozone at ground level, caused by a chemical reaction of gases, such as NO 2 , in the presence of sunlight. The pollutant that is most commonly monitored by regulatory frameworks and for which a lot of evidence of adverse health impact is available is particulate matter followed by nitrogen dioxide.

Ambient (outdoor) air pollution

Household air pollution

How air pollution affects our body

Particles with a diameter of 10 microns or less (≤ PM 10 ) can penetrate and lodge deep inside the lungs, causing irritation, inflammation and damaging the lining of the respiratory tract. Smaller, more health-damaging particles with a diameter of 2.5 microns or less (≤ PM 2.5 – 60 of them make up the width of a human hair) can penetrate the lung barrier and enter the blood system, affecting all major organs of the body. These pollutants increase the risk of heart and respiratory diseases, as well as lung cancer and strokes.

Ozone is a major factor in causing asthma (or making it worse), and nitrogen dioxide and sulfur dioxide can also cause asthma, bronchial symptoms, lung inflammation and reduced lung function. In 2021 WHO updated the Global Air Quality Guidelines, which recommend the maximum safe level for PM 2.5 annual average concentration of 5 μg/m 3  or less. The guidelines provide evidence of the damage air pollution inflicts on human health, at even lower concentrations than previously understood. The updated guidelines provide recommendations on air quality guideline levels as well as interim targets for six key air pollutants. They also offer qualitative statements on good practices for the management of certain types of particulate matter (PM), for example, black carbon/elemental carbon, ultrafine particles, and particles originating from sand and dust storms, for which there is insufficient quantitative evidence to derive AQG levels.

Air pollution has a disastrous effect on children; there were more than 5 million deaths of children under the age of 5 years. More than 27% of those deaths – 1.7 million – were attributable to environmental factors, with air pollution foremost among them. Globally, lower respiratory infections are the second leading cause of death for children under 5 years. Every year, 442 000 children (as of 2022) younger than 5 years die prematurely from breathing polluted air. Evidence suggests that air pollution could also harm children before they are born (reduced birth weight) through their mothers' exposure. There is emerging evidence linking air pollution exposure to cancer, neurodevelopmental and metabolic diseases in children.

As well as affecting our health, pollutants in the air are also causing long-term environmental damage by driving climate change, itself a major threat to health and well-being. 

Already in 2018, the UN Intergovernmental Panel on Climate Change warned that coal-fired electricity must end by 2050 if we are to limit global warming rises to 1.5 °C. If not, we may see a major climate crisis in just 20 years.

Affordable strategies exist to reduce emissions from energy, transport, waste management, housing and industrial sectors. These interventions often carry other benefits like reduced traffic and noise, increased physical activity and better land use – all of which contribute to improving health and well-being. WHO also supports cities with the data, tools and capacity to select, implement and track clean and healthy policies at the city level. Better air quality will benefit all of us, everywhere.

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Environmental and Health Impacts of Air Pollution: A Review

Ioannis manisalidis.

1 Delphis S.A., Kifisia, Greece

2 Laboratory of Hygiene and Environmental Protection, Faculty of Medicine, Democritus University of Thrace, Alexandroupolis, Greece

Elisavet Stavropoulou

3 Centre Hospitalier Universitaire Vaudois (CHUV), Service de Médicine Interne, Lausanne, Switzerland

Agathangelos Stavropoulos

4 School of Social and Political Sciences, University of Glasgow, Glasgow, United Kingdom

Eugenia Bezirtzoglou

One of our era's greatest scourges is air pollution, on account not only of its impact on climate change but also its impact on public and individual health due to increasing morbidity and mortality. There are many pollutants that are major factors in disease in humans. Among them, Particulate Matter (PM), particles of variable but very small diameter, penetrate the respiratory system via inhalation, causing respiratory and cardiovascular diseases, reproductive and central nervous system dysfunctions, and cancer. Despite the fact that ozone in the stratosphere plays a protective role against ultraviolet irradiation, it is harmful when in high concentration at ground level, also affecting the respiratory and cardiovascular system. Furthermore, nitrogen oxide, sulfur dioxide, Volatile Organic Compounds (VOCs), dioxins, and polycyclic aromatic hydrocarbons (PAHs) are all considered air pollutants that are harmful to humans. Carbon monoxide can even provoke direct poisoning when breathed in at high levels. Heavy metals such as lead, when absorbed into the human body, can lead to direct poisoning or chronic intoxication, depending on exposure. Diseases occurring from the aforementioned substances include principally respiratory problems such as Chronic Obstructive Pulmonary Disease (COPD), asthma, bronchiolitis, and also lung cancer, cardiovascular events, central nervous system dysfunctions, and cutaneous diseases. Last but not least, climate change resulting from environmental pollution affects the geographical distribution of many infectious diseases, as do natural disasters. The only way to tackle this problem is through public awareness coupled with a multidisciplinary approach by scientific experts; national and international organizations must address the emergence of this threat and propose sustainable solutions.

Approach to the Problem

The interactions between humans and their physical surroundings have been extensively studied, as multiple human activities influence the environment. The environment is a coupling of the biotic (living organisms and microorganisms) and the abiotic (hydrosphere, lithosphere, and atmosphere).

Pollution is defined as the introduction into the environment of substances harmful to humans and other living organisms. Pollutants are harmful solids, liquids, or gases produced in higher than usual concentrations that reduce the quality of our environment.

Human activities have an adverse effect on the environment by polluting the water we drink, the air we breathe, and the soil in which plants grow. Although the industrial revolution was a great success in terms of technology, society, and the provision of multiple services, it also introduced the production of huge quantities of pollutants emitted into the air that are harmful to human health. Without any doubt, the global environmental pollution is considered an international public health issue with multiple facets. Social, economic, and legislative concerns and lifestyle habits are related to this major problem. Clearly, urbanization and industrialization are reaching unprecedented and upsetting proportions worldwide in our era. Anthropogenic air pollution is one of the biggest public health hazards worldwide, given that it accounts for about 9 million deaths per year ( 1 ).

Without a doubt, all of the aforementioned are closely associated with climate change, and in the event of danger, the consequences can be severe for mankind ( 2 ). Climate changes and the effects of global planetary warming seriously affect multiple ecosystems, causing problems such as food safety issues, ice and iceberg melting, animal extinction, and damage to plants ( 3 , 4 ).

Air pollution has various health effects. The health of susceptible and sensitive individuals can be impacted even on low air pollution days. Short-term exposure to air pollutants is closely related to COPD (Chronic Obstructive Pulmonary Disease), cough, shortness of breath, wheezing, asthma, respiratory disease, and high rates of hospitalization (a measurement of morbidity).

The long-term effects associated with air pollution are chronic asthma, pulmonary insufficiency, cardiovascular diseases, and cardiovascular mortality. According to a Swedish cohort study, diabetes seems to be induced after long-term air pollution exposure ( 5 ). Moreover, air pollution seems to have various malign health effects in early human life, such as respiratory, cardiovascular, mental, and perinatal disorders ( 3 ), leading to infant mortality or chronic disease in adult age ( 6 ).

National reports have mentioned the increased risk of morbidity and mortality ( 1 ). These studies were conducted in many places around the world and show a correlation between daily ranges of particulate matter (PM) concentration and daily mortality. Climate shifts and global planetary warming ( 3 ) could aggravate the situation. Besides, increased hospitalization (an index of morbidity) has been registered among the elderly and susceptible individuals for specific reasons. Fine and ultrafine particulate matter seems to be associated with more serious illnesses ( 6 ), as it can invade the deepest parts of the airways and more easily reach the bloodstream.

Air pollution mainly affects those living in large urban areas, where road emissions contribute the most to the degradation of air quality. There is also a danger of industrial accidents, where the spread of a toxic fog can be fatal to the populations of the surrounding areas. The dispersion of pollutants is determined by many parameters, most notably atmospheric stability and wind ( 6 ).

In developing countries ( 7 ), the problem is more serious due to overpopulation and uncontrolled urbanization along with the development of industrialization. This leads to poor air quality, especially in countries with social disparities and a lack of information on sustainable management of the environment. The use of fuels such as wood fuel or solid fuel for domestic needs due to low incomes exposes people to bad-quality, polluted air at home. It is of note that three billion people around the world are using the above sources of energy for their daily heating and cooking needs ( 8 ). In developing countries, the women of the household seem to carry the highest risk for disease development due to their longer duration exposure to the indoor air pollution ( 8 , 9 ). Due to its fast industrial development and overpopulation, China is one of the Asian countries confronting serious air pollution problems ( 10 , 11 ). The lung cancer mortality observed in China is associated with fine particles ( 12 ). As stated already, long-term exposure is associated with deleterious effects on the cardiovascular system ( 3 , 5 ). However, it is interesting to note that cardiovascular diseases have mostly been observed in developed and high-income countries rather than in the developing low-income countries exposed highly to air pollution ( 13 ). Extreme air pollution is recorded in India, where the air quality reaches hazardous levels. New Delhi is one of the more polluted cities in India. Flights in and out of New Delhi International Airport are often canceled due to the reduced visibility associated with air pollution. Pollution is occurring both in urban and rural areas in India due to the fast industrialization, urbanization, and rise in use of motorcycle transportation. Nevertheless, biomass combustion associated with heating and cooking needs and practices is a major source of household air pollution in India and in Nepal ( 14 , 15 ). There is spatial heterogeneity in India, as areas with diverse climatological conditions and population and education levels generate different indoor air qualities, with higher PM 2.5 observed in North Indian states (557–601 μg/m 3 ) compared to the Southern States (183–214 μg/m 3 ) ( 16 , 17 ). The cold climate of the North Indian areas may be the main reason for this, as longer periods at home and more heating are necessary compared to in the tropical climate of Southern India. Household air pollution in India is associated with major health effects, especially in women and young children, who stay indoors for longer periods. Chronic obstructive respiratory disease (CORD) and lung cancer are mostly observed in women, while acute lower respiratory disease is seen in young children under 5 years of age ( 18 ).

Accumulation of air pollution, especially sulfur dioxide and smoke, reaching 1,500 mg/m3, resulted in an increase in the number of deaths (4,000 deaths) in December 1952 in London and in 1963 in New York City (400 deaths) ( 19 ). An association of pollution with mortality was reported on the basis of monitoring of outdoor pollution in six US metropolitan cities ( 20 ). In every case, it seems that mortality was closely related to the levels of fine, inhalable, and sulfate particles more than with the levels of total particulate pollution, aerosol acidity, sulfur dioxide, or nitrogen dioxide ( 20 ).

Furthermore, extremely high levels of pollution are reported in Mexico City and Rio de Janeiro, followed by Milan, Ankara, Melbourne, Tokyo, and Moscow ( 19 ).

Based on the magnitude of the public health impact, it is certain that different kinds of interventions should be taken into account. Success and effectiveness in controlling air pollution, specifically at the local level, have been reported. Adequate technological means are applied considering the source and the nature of the emission as well as its impact on health and the environment. The importance of point sources and non-point sources of air pollution control is reported by Schwela and Köth-Jahr ( 21 ). Without a doubt, a detailed emission inventory must record all sources in a given area. Beyond considering the above sources and their nature, topography and meteorology should also be considered, as stated previously. Assessment of the control policies and methods is often extrapolated from the local to the regional and then to the global scale. Air pollution may be dispersed and transported from one region to another area located far away. Air pollution management means the reduction to acceptable levels or possible elimination of air pollutants whose presence in the air affects our health or the environmental ecosystem. Private and governmental entities and authorities implement actions to ensure the air quality ( 22 ). Air quality standards and guidelines were adopted for the different pollutants by the WHO and EPA as a tool for the management of air quality ( 1 , 23 ). These standards have to be compared to the emissions inventory standards by causal analysis and dispersion modeling in order to reveal the problematic areas ( 24 ). Inventories are generally based on a combination of direct measurements and emissions modeling ( 24 ).

As an example, we state here the control measures at the source through the use of catalytic converters in cars. These are devices that turn the pollutants and toxic gases produced from combustion engines into less-toxic pollutants by catalysis through redox reactions ( 25 ). In Greece, the use of private cars was restricted by tracking their license plates in order to reduce traffic congestion during rush hour ( 25 ).

Concerning industrial emissions, collectors and closed systems can keep the air pollution to the minimal standards imposed by legislation ( 26 ).

Current strategies to improve air quality require an estimation of the economic value of the benefits gained from proposed programs. These proposed programs by public authorities, and directives are issued with guidelines to be respected.

In Europe, air quality limit values AQLVs (Air Quality Limit Values) are issued for setting off planning claims ( 27 ). In the USA, the NAAQS (National Ambient Air Quality Standards) establish the national air quality limit values ( 27 ). While both standards and directives are based on different mechanisms, significant success has been achieved in the reduction of overall emissions and associated health and environmental effects ( 27 ). The European Directive identifies geographical areas of risk exposure as monitoring/assessment zones to record the emission sources and levels of air pollution ( 27 ), whereas the USA establishes global geographical air quality criteria according to the severity of their air quality problem and records all sources of the pollutants and their precursors ( 27 ).

In this vein, funds have been financing, directly or indirectly, projects related to air quality along with the technical infrastructure to maintain good air quality. These plans focus on an inventory of databases from air quality environmental planning awareness campaigns. Moreover, pollution measures of air emissions may be taken for vehicles, machines, and industries in urban areas.

Technological innovation can only be successful if it is able to meet the needs of society. In this sense, technology must reflect the decision-making practices and procedures of those involved in risk assessment and evaluation and act as a facilitator in providing information and assessments to enable decision makers to make the best decisions possible. Summarizing the aforementioned in order to design an effective air quality control strategy, several aspects must be considered: environmental factors and ambient air quality conditions, engineering factors and air pollutant characteristics, and finally, economic operating costs for technological improvement and administrative and legal costs. Considering the economic factor, competitiveness through neoliberal concepts is offering a solution to environmental problems ( 22 ).

The development of environmental governance, along with technological progress, has initiated the deployment of a dialogue. Environmental politics has created objections and points of opposition between different political parties, scientists, media, and governmental and non-governmental organizations ( 22 ). Radical environmental activism actions and movements have been created ( 22 ). The rise of the new information and communication technologies (ICTs) are many times examined as to whether and in which way they have influenced means of communication and social movements such as activism ( 28 ). Since the 1990s, the term “digital activism” has been used increasingly and in many different disciplines ( 29 ). Nowadays, multiple digital technologies can be used to produce a digital activism outcome on environmental issues. More specifically, devices with online capabilities such as computers or mobile phones are being used as a way to pursue change in political and social affairs ( 30 ).

In the present paper, we focus on the sources of environmental pollution in relation to public health and propose some solutions and interventions that may be of interest to environmental legislators and decision makers.

Sources of Exposure

It is known that the majority of environmental pollutants are emitted through large-scale human activities such as the use of industrial machinery, power-producing stations, combustion engines, and cars. Because these activities are performed at such a large scale, they are by far the major contributors to air pollution, with cars estimated to be responsible for approximately 80% of today's pollution ( 31 ). Some other human activities are also influencing our environment to a lesser extent, such as field cultivation techniques, gas stations, fuel tanks heaters, and cleaning procedures ( 32 ), as well as several natural sources, such as volcanic and soil eruptions and forest fires.

The classification of air pollutants is based mainly on the sources producing pollution. Therefore, it is worth mentioning the four main sources, following the classification system: Major sources, Area sources, Mobile sources, and Natural sources.

Major sources include the emission of pollutants from power stations, refineries, and petrochemicals, the chemical and fertilizer industries, metallurgical and other industrial plants, and, finally, municipal incineration.

Indoor area sources include domestic cleaning activities, dry cleaners, printing shops, and petrol stations.

Mobile sources include automobiles, cars, railways, airways, and other types of vehicles.

Finally, natural sources include, as stated previously, physical disasters ( 33 ) such as forest fire, volcanic erosion, dust storms, and agricultural burning.

However, many classification systems have been proposed. Another type of classification is a grouping according to the recipient of the pollution, as follows:

Air pollution is determined as the presence of pollutants in the air in large quantities for long periods. Air pollutants are dispersed particles, hydrocarbons, CO, CO 2 , NO, NO 2 , SO 3 , etc.

Water pollution is organic and inorganic charge and biological charge ( 10 ) at high levels that affect the water quality ( 34 , 35 ).

Soil pollution occurs through the release of chemicals or the disposal of wastes, such as heavy metals, hydrocarbons, and pesticides.

Air pollution can influence the quality of soil and water bodies by polluting precipitation, falling into water and soil environments ( 34 , 36 ). Notably, the chemistry of the soil can be amended due to acid precipitation by affecting plants, cultures, and water quality ( 37 ). Moreover, movement of heavy metals is favored by soil acidity, and metals are so then moving into the watery environment. It is known that heavy metals such as aluminum are noxious to wildlife and fishes. Soil quality seems to be of importance, as soils with low calcium carbonate levels are at increased jeopardy from acid rain. Over and above rain, snow and particulate matter drip into watery ' bodies ( 36 , 38 ).

Lastly, pollution is classified following type of origin:

Radioactive and nuclear pollution , releasing radioactive and nuclear pollutants into water, air, and soil during nuclear explosions and accidents, from nuclear weapons, and through handling or disposal of radioactive sewage.

Radioactive materials can contaminate surface water bodies and, being noxious to the environment, plants, animals, and humans. It is known that several radioactive substances such as radium and uranium concentrate in the bones and can cause cancers ( 38 , 39 ).

Noise pollution is produced by machines, vehicles, traffic noises, and musical installations that are harmful to our hearing.

The World Health Organization introduced the term DALYs. The DALYs for a disease or health condition is defined as the sum of the Years of Life Lost (YLL) due to premature mortality in the population and the Years Lost due to Disability (YLD) for people living with the health condition or its consequences ( 39 ). In Europe, air pollution is the main cause of disability-adjusted life years lost (DALYs), followed by noise pollution. The potential relationships of noise and air pollution with health have been studied ( 40 ). The study found that DALYs related to noise were more important than those related to air pollution, as the effects of environmental noise on cardiovascular disease were independent of air pollution ( 40 ). Environmental noise should be counted as an independent public health risk ( 40 ).

Environmental pollution occurs when changes in the physical, chemical, or biological constituents of the environment (air masses, temperature, climate, etc.) are produced.

Pollutants harm our environment either by increasing levels above normal or by introducing harmful toxic substances. Primary pollutants are directly produced from the above sources, and secondary pollutants are emitted as by-products of the primary ones. Pollutants can be biodegradable or non-biodegradable and of natural origin or anthropogenic, as stated previously. Moreover, their origin can be a unique source (point-source) or dispersed sources.

Pollutants have differences in physical and chemical properties, explaining the discrepancy in their capacity for producing toxic effects. As an example, we state here that aerosol compounds ( 41 – 43 ) have a greater toxicity than gaseous compounds due to their tiny size (solid or liquid) in the atmosphere; they have a greater penetration capacity. Gaseous compounds are eliminated more easily by our respiratory system ( 41 ). These particles are able to damage lungs and can even enter the bloodstream ( 41 ), leading to the premature deaths of millions of people yearly. Moreover, the aerosol acidity ([H+]) seems to considerably enhance the production of secondary organic aerosols (SOA), but this last aspect is not supported by other scientific teams ( 38 ).

Climate and Pollution

Air pollution and climate change are closely related. Climate is the other side of the same coin that reduces the quality of our Earth ( 44 ). Pollutants such as black carbon, methane, tropospheric ozone, and aerosols affect the amount of incoming sunlight. As a result, the temperature of the Earth is increasing, resulting in the melting of ice, icebergs, and glaciers.

In this vein, climatic changes will affect the incidence and prevalence of both residual and imported infections in Europe. Climate and weather affect the duration, timing, and intensity of outbreaks strongly and change the map of infectious diseases in the globe ( 45 ). Mosquito-transmitted parasitic or viral diseases are extremely climate-sensitive, as warming firstly shortens the pathogen incubation period and secondly shifts the geographic map of the vector. Similarly, water-warming following climate changes leads to a high incidence of waterborne infections. Recently, in Europe, eradicated diseases seem to be emerging due to the migration of population, for example, cholera, poliomyelitis, tick-borne encephalitis, and malaria ( 46 ).

The spread of epidemics is associated with natural climate disasters and storms, which seem to occur more frequently nowadays ( 47 ). Malnutrition and disequilibration of the immune system are also associated with the emerging infections affecting public health ( 48 ).

The Chikungunya virus “took the airplane” from the Indian Ocean to Europe, as outbreaks of the disease were registered in Italy ( 49 ) as well as autochthonous cases in France ( 50 ).

An increase in cryptosporidiosis in the United Kingdom and in the Czech Republic seems to have occurred following flooding ( 36 , 51 ).

As stated previously, aerosols compounds are tiny in size and considerably affect the climate. They are able to dissipate sunlight (the albedo phenomenon) by dispersing a quarter of the sun's rays back to space and have cooled the global temperature over the last 30 years ( 52 ).

Air Pollutants

The World Health Organization (WHO) reports on six major air pollutants, namely particle pollution, ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead. Air pollution can have a disastrous effect on all components of the environment, including groundwater, soil, and air. Additionally, it poses a serious threat to living organisms. In this vein, our interest is mainly to focus on these pollutants, as they are related to more extensive and severe problems in human health and environmental impact. Acid rain, global warming, the greenhouse effect, and climate changes have an important ecological impact on air pollution ( 53 ).

Particulate Matter (PM) and Health

Studies have shown a relationship between particulate matter (PM) and adverse health effects, focusing on either short-term (acute) or long-term (chronic) PM exposure.

Particulate matter (PM) is usually formed in the atmosphere as a result of chemical reactions between the different pollutants. The penetration of particles is closely dependent on their size ( 53 ). Particulate Matter (PM) was defined as a term for particles by the United States Environmental Protection Agency ( 54 ). Particulate matter (PM) pollution includes particles with diameters of 10 micrometers (μm) or smaller, called PM 10 , and extremely fine particles with diameters that are generally 2.5 micrometers (μm) and smaller.

Particulate matter contains tiny liquid or solid droplets that can be inhaled and cause serious health effects ( 55 ). Particles <10 μm in diameter (PM 10 ) after inhalation can invade the lungs and even reach the bloodstream. Fine particles, PM 2.5 , pose a greater risk to health ( 6 , 56 ) ( Table 1 ).

Penetrability according to particle size.

Multiple epidemiological studies have been performed on the health effects of PM. A positive relation was shown between both short-term and long-term exposures of PM 2.5 and acute nasopharyngitis ( 56 ). In addition, long-term exposure to PM for years was found to be related to cardiovascular diseases and infant mortality.

Those studies depend on PM 2.5 monitors and are restricted in terms of study area or city area due to a lack of spatially resolved daily PM 2.5 concentration data and, in this way, are not representative of the entire population. Following a recent epidemiological study by the Department of Environmental Health at Harvard School of Public Health (Boston, MA) ( 57 ), it was reported that, as PM 2.5 concentrations vary spatially, an exposure error (Berkson error) seems to be produced, and the relative magnitudes of the short- and long-term effects are not yet completely elucidated. The team developed a PM 2.5 exposure model based on remote sensing data for assessing short- and long-term human exposures ( 57 ). This model permits spatial resolution in short-term effects plus the assessment of long-term effects in the whole population.

Moreover, respiratory diseases and affection of the immune system are registered as long-term chronic effects ( 58 ). It is worth noting that people with asthma, pneumonia, diabetes, and respiratory and cardiovascular diseases are especially susceptible and vulnerable to the effects of PM. PM 2.5 , followed by PM 10 , are strongly associated with diverse respiratory system diseases ( 59 ), as their size permits them to pierce interior spaces ( 60 ). The particles produce toxic effects according to their chemical and physical properties. The components of PM 10 and PM 2.5 can be organic (polycyclic aromatic hydrocarbons, dioxins, benzene, 1-3 butadiene) or inorganic (carbon, chlorides, nitrates, sulfates, metals) in nature ( 55 ).

Particulate Matter (PM) is divided into four main categories according to type and size ( 61 ) ( Table 2 ).

Types and sizes of particulate Matter (PM).

Gas contaminants include PM in aerial masses.

Particulate contaminants include contaminants such as smog, soot, tobacco smoke, oil smoke, fly ash, and cement dust.

Biological Contaminants are microorganisms (bacteria, viruses, fungi, mold, and bacterial spores), cat allergens, house dust and allergens, and pollen.

Types of Dust include suspended atmospheric dust, settling dust, and heavy dust.

Finally, another fact is that the half-lives of PM 10 and PM 2.5 particles in the atmosphere is extended due to their tiny dimensions; this permits their long-lasting suspension in the atmosphere and even their transfer and spread to distant destinations where people and the environment may be exposed to the same magnitude of pollution ( 53 ). They are able to change the nutrient balance in watery ecosystems, damage forests and crops, and acidify water bodies.

As stated, PM 2.5 , due to their tiny size, are causing more serious health effects. These aforementioned fine particles are the main cause of the “haze” formation in different metropolitan areas ( 12 , 13 , 61 ).

Ozone Impact in the Atmosphere

Ozone (O 3 ) is a gas formed from oxygen under high voltage electric discharge ( 62 ). It is a strong oxidant, 52% stronger than chlorine. It arises in the stratosphere, but it could also arise following chain reactions of photochemical smog in the troposphere ( 63 ).

Ozone can travel to distant areas from its initial source, moving with air masses ( 64 ). It is surprising that ozone levels over cities are low in contrast to the increased amounts occuring in urban areas, which could become harmful for cultures, forests, and vegetation ( 65 ) as it is reducing carbon assimilation ( 66 ). Ozone reduces growth and yield ( 47 , 48 ) and affects the plant microflora due to its antimicrobial capacity ( 67 , 68 ). In this regard, ozone acts upon other natural ecosystems, with microflora ( 69 , 70 ) and animal species changing their species composition ( 71 ). Ozone increases DNA damage in epidermal keratinocytes and leads to impaired cellular function ( 72 ).

Ground-level ozone (GLO) is generated through a chemical reaction between oxides of nitrogen and VOCs emitted from natural sources and/or following anthropogenic activities.

Ozone uptake usually occurs by inhalation. Ozone affects the upper layers of the skin and the tear ducts ( 73 ). A study of short-term exposure of mice to high levels of ozone showed malondialdehyde formation in the upper skin (epidermis) but also depletion in vitamins C and E. It is likely that ozone levels are not interfering with the skin barrier function and integrity to predispose to skin disease ( 74 ).

Due to the low water-solubility of ozone, inhaled ozone has the capacity to penetrate deeply into the lungs ( 75 ).

Toxic effects induced by ozone are registered in urban areas all over the world, causing biochemical, morphologic, functional, and immunological disorders ( 76 ).

The European project (APHEA2) focuses on the acute effects of ambient ozone concentrations on mortality ( 77 ). Daily ozone concentrations compared to the daily number of deaths were reported from different European cities for a 3-year period. During the warm period of the year, an observed increase in ozone concentration was associated with an increase in the daily number of deaths (0.33%), in the number of respiratory deaths (1.13%), and in the number of cardiovascular deaths (0.45%). No effect was observed during wintertime.

Carbon Monoxide (CO)

Carbon monoxide is produced by fossil fuel when combustion is incomplete. The symptoms of poisoning due to inhaling carbon monoxide include headache, dizziness, weakness, nausea, vomiting, and, finally, loss of consciousness.

The affinity of carbon monoxide to hemoglobin is much greater than that of oxygen. In this vein, serious poisoning may occur in people exposed to high levels of carbon monoxide for a long period of time. Due to the loss of oxygen as a result of the competitive binding of carbon monoxide, hypoxia, ischemia, and cardiovascular disease are observed.

Carbon monoxide affects the greenhouses gases that are tightly connected to global warming and climate. This should lead to an increase in soil and water temperatures, and extreme weather conditions or storms may occur ( 68 ).

However, in laboratory and field experiments, it has been seen to produce increased plant growth ( 78 ).

Nitrogen Oxide (NO 2 )

Nitrogen oxide is a traffic-related pollutant, as it is emitted from automobile motor engines ( 79 , 80 ). It is an irritant of the respiratory system as it penetrates deep in the lung, inducing respiratory diseases, coughing, wheezing, dyspnea, bronchospasm, and even pulmonary edema when inhaled at high levels. It seems that concentrations over 0.2 ppm produce these adverse effects in humans, while concentrations higher than 2.0 ppm affect T-lymphocytes, particularly the CD8+ cells and NK cells that produce our immune response ( 81 ).It is reported that long-term exposure to high levels of nitrogen dioxide can be responsible for chronic lung disease. Long-term exposure to NO 2 can impair the sense of smell ( 81 ).

However, systems other than respiratory ones can be involved, as symptoms such as eye, throat, and nose irritation have been registered ( 81 ).

High levels of nitrogen dioxide are deleterious to crops and vegetation, as they have been observed to reduce crop yield and plant growth efficiency. Moreover, NO 2 can reduce visibility and discolor fabrics ( 81 ).

Sulfur Dioxide (SO 2 )

Sulfur dioxide is a harmful gas that is emitted mainly from fossil fuel consumption or industrial activities. The annual standard for SO 2 is 0.03 ppm ( 82 ). It affects human, animal, and plant life. Susceptible people as those with lung disease, old people, and children, who present a higher risk of damage. The major health problems associated with sulfur dioxide emissions in industrialized areas are respiratory irritation, bronchitis, mucus production, and bronchospasm, as it is a sensory irritant and penetrates deep into the lung converted into bisulfite and interacting with sensory receptors, causing bronchoconstriction. Moreover, skin redness, damage to the eyes (lacrimation and corneal opacity) and mucous membranes, and worsening of pre-existing cardiovascular disease have been observed ( 81 ).

Environmental adverse effects, such as acidification of soil and acid rain, seem to be associated with sulfur dioxide emissions ( 83 ).

Lead is a heavy metal used in different industrial plants and emitted from some petrol motor engines, batteries, radiators, waste incinerators, and waste waters ( 84 ).

Moreover, major sources of lead pollution in the air are metals, ore, and piston-engine aircraft. Lead poisoning is a threat to public health due to its deleterious effects upon humans, animals, and the environment, especially in the developing countries.

Exposure to lead can occur through inhalation, ingestion, and dermal absorption. Trans- placental transport of lead was also reported, as lead passes through the placenta unencumbered ( 85 ). The younger the fetus is, the more harmful the toxic effects. Lead toxicity affects the fetal nervous system; edema or swelling of the brain is observed ( 86 ). Lead, when inhaled, accumulates in the blood, soft tissue, liver, lung, bones, and cardiovascular, nervous, and reproductive systems. Moreover, loss of concentration and memory, as well as muscle and joint pain, were observed in adults ( 85 , 86 ).

Children and newborns ( 87 ) are extremely susceptible even to minimal doses of lead, as it is a neurotoxicant and causes learning disabilities, impairment of memory, hyperactivity, and even mental retardation.

Elevated amounts of lead in the environment are harmful to plants and crop growth. Neurological effects are observed in vertebrates and animals in association with high lead levels ( 88 ).

Polycyclic Aromatic Hydrocarbons(PAHs)

The distribution of PAHs is ubiquitous in the environment, as the atmosphere is the most important means of their dispersal. They are found in coal and in tar sediments. Moreover, they are generated through incomplete combustion of organic matter as in the cases of forest fires, incineration, and engines ( 89 ). PAH compounds, such as benzopyrene, acenaphthylene, anthracene, and fluoranthene are recognized as toxic, mutagenic, and carcinogenic substances. They are an important risk factor for lung cancer ( 89 ).

Volatile Organic Compounds(VOCs)

Volatile organic compounds (VOCs), such as toluene, benzene, ethylbenzene, and xylene ( 90 ), have been found to be associated with cancer in humans ( 91 ). The use of new products and materials has actually resulted in increased concentrations of VOCs. VOCs pollute indoor air ( 90 ) and may have adverse effects on human health ( 91 ). Short-term and long-term adverse effects on human health are observed. VOCs are responsible for indoor air smells. Short-term exposure is found to cause irritation of eyes, nose, throat, and mucosal membranes, while those of long duration exposure include toxic reactions ( 92 ). Predictable assessment of the toxic effects of complex VOC mixtures is difficult to estimate, as these pollutants can have synergic, antagonistic, or indifferent effects ( 91 , 93 ).

Dioxins originate from industrial processes but also come from natural processes, such as forest fires and volcanic eruptions. They accumulate in foods such as meat and dairy products, fish and shellfish, and especially in the fatty tissue of animals ( 94 ).

Short-period exhibition to high dioxin concentrations may result in dark spots and lesions on the skin ( 94 ). Long-term exposure to dioxins can cause developmental problems, impairment of the immune, endocrine and nervous systems, reproductive infertility, and cancer ( 94 ).

Without any doubt, fossil fuel consumption is responsible for a sizeable part of air contamination. This contamination may be anthropogenic, as in agricultural and industrial processes or transportation, while contamination from natural sources is also possible. Interestingly, it is of note that the air quality standards established through the European Air Quality Directive are somewhat looser than the WHO guidelines, which are stricter ( 95 ).

Effect of Air Pollution on Health

The most common air pollutants are ground-level ozone and Particulates Matter (PM). Air pollution is distinguished into two main types:

Outdoor pollution is the ambient air pollution.

Indoor pollution is the pollution generated by household combustion of fuels.

People exposed to high concentrations of air pollutants experience disease symptoms and states of greater and lesser seriousness. These effects are grouped into short- and long-term effects affecting health.

Susceptible populations that need to be aware of health protection measures include old people, children, and people with diabetes and predisposing heart or lung disease, especially asthma.

As extensively stated previously, according to a recent epidemiological study from Harvard School of Public Health, the relative magnitudes of the short- and long-term effects have not been completely clarified ( 57 ) due to the different epidemiological methodologies and to the exposure errors. New models are proposed for assessing short- and long-term human exposure data more successfully ( 57 ). Thus, in the present section, we report the more common short- and long-term health effects but also general concerns for both types of effects, as these effects are often dependent on environmental conditions, dose, and individual susceptibility.

Short-term effects are temporary and range from simple discomfort, such as irritation of the eyes, nose, skin, throat, wheezing, coughing and chest tightness, and breathing difficulties, to more serious states, such as asthma, pneumonia, bronchitis, and lung and heart problems. Short-term exposure to air pollution can also cause headaches, nausea, and dizziness.

These problems can be aggravated by extended long-term exposure to the pollutants, which is harmful to the neurological, reproductive, and respiratory systems and causes cancer and even, rarely, deaths.

The long-term effects are chronic, lasting for years or the whole life and can even lead to death. Furthermore, the toxicity of several air pollutants may also induce a variety of cancers in the long term ( 96 ).

As stated already, respiratory disorders are closely associated with the inhalation of air pollutants. These pollutants will invade through the airways and will accumulate at the cells. Damage to target cells should be related to the pollutant component involved and its source and dose. Health effects are also closely dependent on country, area, season, and time. An extended exposure duration to the pollutant should incline to long-term health effects in relation also to the above factors.

Particulate Matter (PMs), dust, benzene, and O 3 cause serious damage to the respiratory system ( 97 ). Moreover, there is a supplementary risk in case of existing respiratory disease such as asthma ( 98 ). Long-term effects are more frequent in people with a predisposing disease state. When the trachea is contaminated by pollutants, voice alterations may be remarked after acute exposure. Chronic obstructive pulmonary disease (COPD) may be induced following air pollution, increasing morbidity and mortality ( 99 ). Long-term effects from traffic, industrial air pollution, and combustion of fuels are the major factors for COPD risk ( 99 ).

Multiple cardiovascular effects have been observed after exposure to air pollutants ( 100 ). Changes occurred in blood cells after long-term exposure may affect cardiac functionality. Coronary arteriosclerosis was reported following long-term exposure to traffic emissions ( 101 ), while short-term exposure is related to hypertension, stroke, myocardial infracts, and heart insufficiency. Ventricle hypertrophy is reported to occur in humans after long-time exposure to nitrogen oxide (NO 2 ) ( 102 , 103 ).

Neurological effects have been observed in adults and children after extended-term exposure to air pollutants.

Psychological complications, autism, retinopathy, fetal growth, and low birth weight seem to be related to long-term air pollution ( 83 ). The etiologic agent of the neurodegenerative diseases (Alzheimer's and Parkinson's) is not yet known, although it is believed that extended exposure to air pollution seems to be a factor. Specifically, pesticides and metals are cited as etiological factors, together with diet. The mechanisms in the development of neurodegenerative disease include oxidative stress, protein aggregation, inflammation, and mitochondrial impairment in neurons ( 104 ) ( Figure 1 ).

Impact of air pollutants on the brain.

Brain inflammation was observed in dogs living in a highly polluted area in Mexico for a long period ( 105 ). In human adults, markers of systemic inflammation (IL-6 and fibrinogen) were found to be increased as an immediate response to PNC on the IL-6 level, possibly leading to the production of acute-phase proteins ( 106 ). The progression of atherosclerosis and oxidative stress seem to be the mechanisms involved in the neurological disturbances caused by long-term air pollution. Inflammation comes secondary to the oxidative stress and seems to be involved in the impairment of developmental maturation, affecting multiple organs ( 105 , 107 ). Similarly, other factors seem to be involved in the developmental maturation, which define the vulnerability to long-term air pollution. These include birthweight, maternal smoking, genetic background and socioeconomic environment, as well as education level.

However, diet, starting from breast-feeding, is another determinant factor. Diet is the main source of antioxidants, which play a key role in our protection against air pollutants ( 108 ). Antioxidants are free radical scavengers and limit the interaction of free radicals in the brain ( 108 ). Similarly, genetic background may result in a differential susceptibility toward the oxidative stress pathway ( 60 ). For example, antioxidant supplementation with vitamins C and E appears to modulate the effect of ozone in asthmatic children homozygous for the GSTM1 null allele ( 61 ). Inflammatory cytokines released in the periphery (e.g., respiratory epithelia) upregulate the innate immune Toll-like receptor 2. Such activation and the subsequent events leading to neurodegeneration have recently been observed in lung lavage in mice exposed to ambient Los Angeles (CA, USA) particulate matter ( 61 ). In children, neurodevelopmental morbidities were observed after lead exposure. These children developed aggressive and delinquent behavior, reduced intelligence, learning difficulties, and hyperactivity ( 109 ). No level of lead exposure seems to be “safe,” and the scientific community has asked the Centers for Disease Control and Prevention (CDC) to reduce the current screening guideline of 10 μg/dl ( 109 ).

It is important to state that impact on the immune system, causing dysfunction and neuroinflammation ( 104 ), is related to poor air quality. Yet, increases in serum levels of immunoglobulins (IgA, IgM) and the complement component C3 are observed ( 106 ). Another issue is that antigen presentation is affected by air pollutants, as there is an upregulation of costimulatory molecules such as CD80 and CD86 on macrophages ( 110 ).

As is known, skin is our shield against ultraviolet radiation (UVR) and other pollutants, as it is the most exterior layer of our body. Traffic-related pollutants, such as PAHs, VOCs, oxides, and PM, may cause pigmented spots on our skin ( 111 ). On the one hand, as already stated, when pollutants penetrate through the skin or are inhaled, damage to the organs is observed, as some of these pollutants are mutagenic and carcinogenic, and, specifically, they affect the liver and lung. On the other hand, air pollutants (and those in the troposphere) reduce the adverse effects of ultraviolet radiation UVR in polluted urban areas ( 111 ). Air pollutants absorbed by the human skin may contribute to skin aging, psoriasis, acne, urticaria, eczema, and atopic dermatitis ( 111 ), usually caused by exposure to oxides and photochemical smoke ( 111 ). Exposure to PM and cigarette smoking act as skin-aging agents, causing spots, dyschromia, and wrinkles. Lastly, pollutants have been associated with skin cancer ( 111 ).

Higher morbidity is reported to fetuses and children when exposed to the above dangers. Impairment in fetal growth, low birth weight, and autism have been reported ( 112 ).

Another exterior organ that may be affected is the eye. Contamination usually comes from suspended pollutants and may result in asymptomatic eye outcomes, irritation ( 112 ), retinopathy, or dry eye syndrome ( 113 , 114 ).

Environmental Impact of Air Pollution

Air pollution is harming not only human health but also the environment ( 115 ) in which we live. The most important environmental effects are as follows.

Acid rain is wet (rain, fog, snow) or dry (particulates and gas) precipitation containing toxic amounts of nitric and sulfuric acids. They are able to acidify the water and soil environments, damage trees and plantations, and even damage buildings and outdoor sculptures, constructions, and statues.

Haze is produced when fine particles are dispersed in the air and reduce the transparency of the atmosphere. It is caused by gas emissions in the air coming from industrial facilities, power plants, automobiles, and trucks.

Ozone , as discussed previously, occurs both at ground level and in the upper level (stratosphere) of the Earth's atmosphere. Stratospheric ozone is protecting us from the Sun's harmful ultraviolet (UV) rays. In contrast, ground-level ozone is harmful to human health and is a pollutant. Unfortunately, stratospheric ozone is gradually damaged by ozone-depleting substances (i.e., chemicals, pesticides, and aerosols). If this protecting stratospheric ozone layer is thinned, then UV radiation can reach our Earth, with harmful effects for human life (skin cancer) ( 116 ) and crops ( 117 ). In plants, ozone penetrates through the stomata, inducing them to close, which blocks CO 2 transfer and induces a reduction in photosynthesis ( 118 ).

Global climate change is an important issue that concerns mankind. As is known, the “greenhouse effect” keeps the Earth's temperature stable. Unhappily, anthropogenic activities have destroyed this protecting temperature effect by producing large amounts of greenhouse gases, and global warming is mounting, with harmful effects on human health, animals, forests, wildlife, agriculture, and the water environment. A report states that global warming is adding to the health risks of poor people ( 119 ).

People living in poorly constructed buildings in warm-climate countries are at high risk for heat-related health problems as temperatures mount ( 119 ).

Wildlife is burdened by toxic pollutants coming from the air, soil, or the water ecosystem and, in this way, animals can develop health problems when exposed to high levels of pollutants. Reproductive failure and birth effects have been reported.

Eutrophication is occurring when elevated concentrations of nutrients (especially nitrogen) stimulate the blooming of aquatic algae, which can cause a disequilibration in the diversity of fish and their deaths.

Without a doubt, there is a critical concentration of pollution that an ecosystem can tolerate without being destroyed, which is associated with the ecosystem's capacity to neutralize acidity. The Canada Acid Rain Program established this load at 20 kg/ha/yr ( 120 ).

Hence, air pollution has deleterious effects on both soil and water ( 121 ). Concerning PM as an air pollutant, its impact on crop yield and food productivity has been reported. Its impact on watery bodies is associated with the survival of living organisms and fishes and their productivity potential ( 121 ).

An impairment in photosynthetic rhythm and metabolism is observed in plants exposed to the effects of ozone ( 121 ).

Sulfur and nitrogen oxides are involved in the formation of acid rain and are harmful to plants and marine organisms.

Last but not least, as mentioned above, the toxicity associated with lead and other metals is the main threat to our ecosystems (air, water, and soil) and living creatures ( 121 ).

In 2018, during the first WHO Global Conference on Air Pollution and Health, the WHO's General Director, Dr. Tedros Adhanom Ghebreyesus, called air pollution a “silent public health emergency” and “the new tobacco” ( 122 ).

Undoubtedly, children are particularly vulnerable to air pollution, especially during their development. Air pollution has adverse effects on our lives in many different respects.

Diseases associated with air pollution have not only an important economic impact but also a societal impact due to absences from productive work and school.

Despite the difficulty of eradicating the problem of anthropogenic environmental pollution, a successful solution could be envisaged as a tight collaboration of authorities, bodies, and doctors to regularize the situation. Governments should spread sufficient information and educate people and should involve professionals in these issues so as to control the emergence of the problem successfully.

Technologies to reduce air pollution at the source must be established and should be used in all industries and power plants. The Kyoto Protocol of 1997 set as a major target the reduction of GHG emissions to below 5% by 2012 ( 123 ). This was followed by the Copenhagen summit, 2009 ( 124 ), and then the Durban summit of 2011 ( 125 ), where it was decided to keep to the same line of action. The Kyoto protocol and the subsequent ones were ratified by many countries. Among the pioneers who adopted this important protocol for the world's environmental and climate “health” was China ( 3 ). As is known, China is a fast-developing economy and its GDP (Gross Domestic Product) is expected to be very high by 2050, which is defined as the year of dissolution of the protocol for the decrease in gas emissions.

A more recent international agreement of crucial importance for climate change is the Paris Agreement of 2015, issued by the UNFCCC (United Nations Climate Change Committee). This latest agreement was ratified by a plethora of UN (United Nations) countries as well as the countries of the European Union ( 126 ). In this vein, parties should promote actions and measures to enhance numerous aspects around the subject. Boosting education, training, public awareness, and public participation are some of the relevant actions for maximizing the opportunities to achieve the targets and goals on the crucial matter of climate change and environmental pollution ( 126 ). Without any doubt, technological improvements makes our world easier and it seems difficult to reduce the harmful impact caused by gas emissions, we could limit its use by seeking reliable approaches.

Synopsizing, a global prevention policy should be designed in order to combat anthropogenic air pollution as a complement to the correct handling of the adverse health effects associated with air pollution. Sustainable development practices should be applied, together with information coming from research in order to handle the problem effectively.

At this point, international cooperation in terms of research, development, administration policy, monitoring, and politics is vital for effective pollution control. Legislation concerning air pollution must be aligned and updated, and policy makers should propose the design of a powerful tool of environmental and health protection. As a result, the main proposal of this essay is that we should focus on fostering local structures to promote experience and practice and extrapolate these to the international level through developing effective policies for sustainable management of ecosystems.

Author Contributions

All authors listed have made a substantial, direct and intellectual contribution to the work, and approved it for publication.

Conflict of Interest

IM is employed by the company Delphis S.A. The remaining authors declare that the present review paper was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Lisa Hupp/USFWS

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Air Pollution: Everything You Need to Know

How smog, soot, greenhouse gases, and other top air pollutants are affecting the planet—and your health.

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What is air pollution?

What causes air pollution, effects of air pollution, air pollution in the united states, air pollution and environmental justice, controlling air pollution, how to help reduce air pollution, how to protect your health.

Air pollution  refers to the release of pollutants into the air—pollutants that are detrimental to human health and the planet as a whole. According to the  World Health Organization (WHO) , each year, indoor and outdoor air pollution is responsible for nearly seven million deaths around the globe. Ninety-nine percent of human beings currently breathe air that exceeds the WHO’s guideline limits for pollutants, with those living in low- and middle-income countries suffering the most. In the United States, the  Clean Air Act , established in 1970, authorizes the U.S. Environmental Protection Agency (EPA) to safeguard public health by regulating the emissions of these harmful air pollutants.

“Most air pollution comes from energy use and production,” says  John Walke , director of the Clean Air team at NRDC. Driving a car on gasoline, heating a home with oil, running a power plant on  fracked gas : In each case, a fossil fuel is burned and harmful chemicals and gases are released into the air.

“We’ve made progress over the last 50 years in improving air quality in the United States, thanks to the Clean Air Act. But climate change will make it harder in the future to meet pollution standards, which are designed to  protect health ,” says Walke.

Air pollution is now the world’s fourth-largest risk factor for early death. According to the 2020  State of Global Air  report —which summarizes the latest scientific understanding of air pollution around the world—4.5 million deaths were linked to outdoor air pollution exposures in 2019, and another 2.2 million deaths were caused by indoor air pollution. The world’s most populous countries, China and India, continue to bear the highest burdens of disease.

“Despite improvements in reducing global average mortality rates from air pollution, this report also serves as a sobering reminder that the climate crisis threatens to worsen air pollution problems significantly,” explains  Vijay Limaye , senior scientist in NRDC’s Science Office. Smog, for instance, is intensified by increased heat, forming when the weather is warmer and there’s more ultraviolet radiation. In addition, climate change increases the production of allergenic air pollutants, including mold (thanks to damp conditions caused by extreme weather and increased flooding) and pollen (due to a longer pollen season). “Climate change–fueled droughts and dry conditions are also setting the stage for dangerous wildfires,” adds Limaye. “ Wildfire smoke can linger for days and pollute the air with particulate matter hundreds of miles downwind.”

The effects of air pollution on the human body vary, depending on the type of pollutant, the length and level of exposure, and other factors, including a person’s individual health risks and the cumulative impacts of multiple pollutants or stressors.

Smog and soot

These are the two most prevalent types of air pollution. Smog (sometimes referred to as ground-level ozone) occurs when emissions from combusting fossil fuels react with sunlight. Soot—a type of  particulate matter —is made up of tiny particles of chemicals, soil, smoke, dust, or allergens that are carried in the air. The sources of smog and soot are similar. “Both come from cars and trucks, factories, power plants, incinerators, engines, generally anything that combusts fossil fuels such as coal, gasoline, or natural gas,” Walke says.

Smog can irritate the eyes and throat and also damage the lungs, especially those of children, senior citizens, and people who work or exercise outdoors. It’s even worse for people who have asthma or allergies; these extra pollutants can intensify their symptoms and trigger asthma attacks. The tiniest airborne particles in soot are especially dangerous because they can penetrate the lungs and bloodstream and worsen bronchitis, lead to heart attacks, and even hasten death. In  2020, a report from Harvard’s T.H. Chan School of Public Health showed that COVID-19 mortality rates were higher in areas with more particulate matter pollution than in areas with even slightly less, showing a correlation between the virus’s deadliness and long-term exposure to air pollution. 

These findings also illuminate an important  environmental justice issue . Because highways and polluting facilities have historically been sited in or next to low-income neighborhoods and communities of color, the negative effects of this pollution have been  disproportionately experienced by the people who live in these communities.

Hazardous air pollutants

A number of air pollutants pose severe health risks and can sometimes be fatal, even in small amounts. Almost 200 of them are regulated by law; some of the most common are mercury,  lead , dioxins, and benzene. “These are also most often emitted during gas or coal combustion, incineration, or—in the case of benzene—found in gasoline,” Walke says. Benzene, classified as a carcinogen by the EPA, can cause eye, skin, and lung irritation in the short term and blood disorders in the long term. Dioxins, more typically found in food but also present in small amounts in the air, is another carcinogen that can affect the liver in the short term and harm the immune, nervous, and endocrine systems, as well as reproductive functions.  Mercury  attacks the central nervous system. In large amounts, lead can damage children’s brains and kidneys, and even minimal exposure can affect children’s IQ and ability to learn.

Another category of toxic compounds, polycyclic aromatic hydrocarbons (PAHs), are by-products of traffic exhaust and wildfire smoke. In large amounts, they have been linked to eye and lung irritation, blood and liver issues, and even cancer.  In one study , the children of mothers exposed to PAHs during pregnancy showed slower brain-processing speeds and more pronounced symptoms of ADHD.

Greenhouse gases

While these climate pollutants don’t have the direct or immediate impacts on the human body associated with other air pollutants, like smog or hazardous chemicals, they are still harmful to our health. By trapping the earth’s heat in the atmosphere, greenhouse gases lead to warmer temperatures, which in turn lead to the hallmarks of climate change: rising sea levels, more extreme weather, heat-related deaths, and the increased transmission of infectious diseases. In 2021, carbon dioxide accounted for roughly 79 percent of the country’s total greenhouse gas emissions, and methane made up more than 11 percent. “Carbon dioxide comes from combusting fossil fuels, and methane comes from natural and industrial sources, including large amounts that are released during oil and gas drilling,” Walke says. “We emit far larger amounts of carbon dioxide, but methane is significantly more potent, so it’s also very destructive.” 

Another class of greenhouse gases,  hydrofluorocarbons (HFCs) , are thousands of times more powerful than carbon dioxide in their ability to trap heat. In October 2016, more than 140 countries signed the Kigali Agreement to reduce the use of these chemicals—which are found in air conditioners and refrigerators—and develop greener alternatives over time. (The United States officially signed onto the  Kigali Agreement in 2022.)

Pollen and mold

Mold and allergens from trees, weeds, and grass are also carried in the air, are exacerbated by climate change, and can be hazardous to health. Though they aren’t regulated, they can be considered a form of air pollution. “When homes, schools, or businesses get water damage, mold can grow and produce allergenic airborne pollutants,” says Kim Knowlton, professor of environmental health sciences at Columbia University and a former NRDC scientist. “ Mold exposure can precipitate asthma attacks  or an allergic response, and some molds can even produce toxins that would be dangerous for anyone to inhale.”

Pollen allergies are worsening  because of climate change . “Lab and field studies are showing that pollen-producing plants—especially ragweed—grow larger and produce more pollen when you increase the amount of carbon dioxide that they grow in,” Knowlton says. “Climate change also extends the pollen production season, and some studies are beginning to suggest that ragweed pollen itself might be becoming a more potent allergen.” If so, more people will suffer runny noses, fevers, itchy eyes, and other symptoms. “And for people with allergies and asthma, pollen peaks can precipitate asthma attacks, which are far more serious and can be life-threatening.”

More than one in three U.S. residents—120 million people—live in counties with unhealthy levels of air pollution, according to the  2023  State of the Air  report by the American Lung Association (ALA). Since the annual report was first published, in 2000, its findings have shown how the Clean Air Act has been able to reduce harmful emissions from transportation, power plants, and manufacturing.

Recent findings, however, reflect how climate change–fueled wildfires and extreme heat are adding to the challenges of protecting public health. The latest report—which focuses on ozone, year-round particle pollution, and short-term particle pollution—also finds that people of color are 61 percent more likely than white people to live in a county with a failing grade in at least one of those categories, and three times more likely to live in a county that fails in all three.

In rankings for each of the three pollution categories covered by the ALA report, California cities occupy the top three slots (i.e., were highest in pollution), despite progress that the Golden State has made in reducing air pollution emissions in the past half century. At the other end of the spectrum, these cities consistently rank among the country’s best for air quality: Burlington, Vermont; Honolulu; and Wilmington, North Carolina. 

No one wants to live next door to an incinerator, oil refinery, port, toxic waste dump, or other polluting site. Yet millions of people around the world do, and this puts them at a much higher risk for respiratory disease, cardiovascular disease, neurological damage, cancer, and death. In the United States, people of color are 1.5 times more likely than whites to live in areas with poor air quality, according to the ALA.

Historically, racist zoning policies and discriminatory lending practices known as  redlining  have combined to keep polluting industries and car-choked highways away from white neighborhoods and have turned communities of color—especially low-income and working-class communities of color—into sacrifice zones, where residents are forced to breathe dirty air and suffer the many health problems associated with it. In addition to the increased health risks that come from living in such places, the polluted air can economically harm residents in the form of missed workdays and higher medical costs.

Environmental racism isn't limited to cities and industrial areas. Outdoor laborers, including the estimated three million migrant and seasonal farmworkers in the United States, are among the most vulnerable to air pollution—and they’re also among the least equipped, politically, to pressure employers and lawmakers to affirm their right to breathe clean air.

Recently,  cumulative impact mapping , which uses data on environmental conditions and demographics, has been able to show how some communities are overburdened with layers of issues, like high levels of poverty, unemployment, and pollution. Tools like the  Environmental Justice Screening Method  and the EPA’s  EJScreen  provide evidence of what many environmental justice communities have been explaining for decades: that we need land use and public health reforms to ensure that vulnerable areas are not overburdened and that the people who need resources the most are receiving them.

In the United States, the  Clean Air Act  has been a crucial tool for reducing air pollution since its passage in 1970, although fossil fuel interests aided by industry-friendly lawmakers have frequently attempted to  weaken its many protections. Ensuring that this bedrock environmental law remains intact and properly enforced will always be key to maintaining and improving our air quality.

But the best, most effective way to control air pollution is to speed up our transition to cleaner fuels and industrial processes. By switching over to renewable energy sources (such as wind and solar power), maximizing fuel efficiency in our vehicles, and replacing more and more of our gasoline-powered cars and trucks with electric versions, we'll be limiting air pollution at its source while also curbing the global warming that heightens so many of its worst health impacts.

And what about the economic costs of controlling air pollution? According to a report on the Clean Air Act commissioned by NRDC, the annual  benefits of cleaner air  are up to 32 times greater than the cost of clean air regulations. Those benefits include up to 370,000 avoided premature deaths, 189,000 fewer hospital admissions for cardiac and respiratory illnesses, and net economic benefits of up to $3.8 trillion for the U.S. economy every year.

“The less gasoline we burn, the better we’re doing to reduce air pollution and the harmful effects of climate change,” Walke explains. “Make good choices about transportation. When you can, ride a bike, walk, or take public transportation. For driving, choose a car that gets better miles per gallon of gas or  buy an electric car .” You can also investigate your power provider options—you may be able to request that your electricity be supplied by wind or solar. Buying your food locally cuts down on the fossil fuels burned in trucking or flying food in from across the world. And most important: “Support leaders who push for clean air and water and responsible steps on climate change,” Walke says.

• “When you see in the news or hear on the weather report that pollution levels are high, it may be useful to limit the time when children go outside or you go for a jog,” Walke says. Generally, ozone levels tend to be lower in the morning.
• If you exercise outside, stay as far as you can from heavily trafficked roads. Then shower and wash your clothes to remove fine particles.
• The air may look clear, but that doesn’t mean it’s pollution free. Utilize tools like the EPA’s air pollution monitor,  AirNow , to get the latest conditions. If the air quality is bad, stay inside with the windows closed.
• If you live or work in an area that’s prone to wildfires,  stay away from the harmful smoke  as much as you’re able. Consider keeping a small stock of masks to wear when conditions are poor. The most ideal masks for smoke particles will be labelled “NIOSH” (which stands for National Institute for Occupational Safety and Health) and have either “N95” or “P100” printed on it.
• If you’re using an air conditioner while outdoor pollution conditions are bad, use the recirculating setting to limit the amount of polluted air that gets inside. 

This story was originally published on November 1, 2016, and has been updated with new information and links.

This NRDC.org story is available for online republication by news media outlets or nonprofits under these conditions: The writer(s) must be credited with a byline; you must note prominently that the story was originally published by NRDC.org and link to the original; the story cannot be edited (beyond simple things such as grammar); you can’t resell the story in any form or grant republishing rights to other outlets; you can’t republish our material wholesale or automatically—you need to select stories individually; you can’t republish the photos or graphics on our site without specific permission; you should drop us a note to let us know when you’ve used one of our stories.

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Air Pollution

Our overview of indoor and outdoor air pollution.

By: Hannah Ritchie and Max Roser

This article was first published in October 2017 and last revised in February 2024.

Air pollution is one of the world's largest health and environmental problems. It develops in two contexts: indoor (household) air pollution and outdoor air pollution.

In this topic page, we look at the aggregate picture of air pollution – both indoor and outdoor. We also have dedicated topic pages that look in more depth at these subjects:

Indoor Air Pollution

Look in detail at the data and research on the health impacts of Indoor Air Pollution, attributed deaths, and its causes across the world

Outdoor Air Pollution

Look in detail at the data and research on exposure to Outdoor Air Pollution, its health impacts, and attributed deaths across the world

Look in detail at the data and research on energy consumption, its impacts around the world today, and how this has changed over time

See all interactive charts on Air Pollution ↓

Other research and writing on air pollution on Our World in Data:

• Air pollution: does it get worse before it gets better?
• Data Review: How many people die from air pollution?
• Energy poverty and indoor air pollution: a problem as old as humanity that we can end within our lifetime
• How many people do not have access to clean fuels for cooking?
• What are the safest and cleanest sources of energy?
• What the history of London’s air pollution can tell us about the future of today’s growing megacities
• When will countries phase out coal power?

Air pollution is one of the world's leading risk factors for death

Air pollution is responsible for millions of deaths each year.

Air pollution – the combination of outdoor and indoor particulate matter and ozone – is a risk factor for many of the leading causes of death, including heart disease, stroke, lower respiratory infections, lung cancer, diabetes, and chronic obstructive pulmonary disease (COPD).

The Institute for Health Metrics and Evaluation (IHME), in its Global Burden of Disease study, provides estimates of the number of deaths attributed to the range of risk factors for disease. 1

In the visualization, we see the number of deaths per year attributed to each risk factor. This chart shows the global total but can be explored for any country or region using the "change country" toggle.

Air pollution is one of the leading risk factors for death. In low-income countries, it is often very near the top of the list (or is the leading risk factor).

Air pollution contributes to one in ten deaths globally

In recent years, air pollution has contributed to one in ten deaths globally. 2

In the map shown here, we see the share of deaths attributed to air pollution across the world.

Air pollution is one of the leading risk factors for disease burden

Air pollution is one of the leading risk factors for death. But its impacts go even further; it is also one of the main contributors to the global disease burden.

Global disease burden takes into account not only years of life lost to early death but also the number of years lived in poor health.

In the visualization, we see risk factors ranked in order of DALYs – disability-adjusted life years – the metric used to assess disease burden. Again, air pollution is near the top of the list, making it one of the leading risk factors for poor health across the world.

Air pollution not only takes years from people's lives but also has a large effect on the quality of life while they're still living.

Who is most affected by air pollution?

Death rates from air pollution are highest in low-to-middle-income countries.

Air pollution is a health and environmental issue across all countries of the world but with large differences in severity.

In the interactive map, we show death rates from air pollution across the world, measured as the number of deaths per 100,000 people in a given country or region.

The burden of air pollution tends to be greater across both low and middle-income countries for two reasons: indoor pollution rates tend to be high in low-income countries due to a reliance on solid fuels for cooking, and outdoor air pollution tends to increase as countries industrialize and shift from low to middle incomes.

A map of the number of deaths from air pollution by country can be found here .

How are death rates from air pollution changing?

Death rates from air pollution are falling – mainly due to improvements in indoor pollution.

In the visualization, we show global death rates from air pollution over time – shown as the total air pollution – in addition to the individual contributions from outdoor and indoor pollution.

Globally, we see that in recent decades, the death rates from total air pollution have declined: since 1990, death rates have nearly halved. But, as we see from the breakdown, this decline has been primarily driven by improvements in indoor air pollution.

Death rates from indoor air pollution have seen an impressive decline, while improvements in outdoor pollution have been much more modest.

You can explore this data for any country or region using the "change country" toggle on the interactive chart.

Interactive charts on air pollution

Murray, C. J., Aravkin, A. Y., Zheng, P., Abbafati, C., Abbas, K. M., Abbasi-Kangevari, M., ... & Borzouei, S. (2020). Global burden of 87 risk factors in 204 countries and territories, 1990–2019: a systematic analysis for the Global Burden of Disease Study 2019 .  The Lancet ,  396 (10258), 1223-1249.

Here, we use the term 'contributes,' meaning it was one of the attributed risk factors for a given disease or cause of death. There can be multiple risk factors for a given disease that can amplify one another. This means that in some cases, air pollution was not the only risk factor but one of several.

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Staying Healthy

Air pollution: How to reduce harm to your health

Eat plenty of fruits and vegetables. Get regular exercise. Don't smoke. Control high blood pressure, diabetes, and cholesterol. These are age-old words of wisdom for a healthful life. But when was the last time your doctors told you to avoid exposure to pollution? Accumulating evidence about the impact of pollution on our health suggests that this should be another recommendation — though it wouldn't be easy to follow.

What is pollution?

A simple description of pollution is anything introduced into the environment by humans and that harms human health or ecosystems. As such, there are many kinds of pollution — in the air, water, and soil — which can take the form of gases, heavy metals, chemicals, bacteria, and even noise.

Let's focus here on air pollution. Outdoor air pollution includes the burning of fossil fuels (coal, gas, oil) and wildfires. These generate noxious gases, smog (created by ground-level ozone), and soot (fine particles) that are harmful to breathe. Among the contributors to indoor air pollution are fireplaces and home cookstoves that use gas, coal, or biomass fuels such as wood or crop waste that are sometimes used in low-income countries.

Air pollution is a complex and vicious cycle. Its toxic effects are worsened by increased temperatures . Higher temperatures in turn increase the risk of uncontrolled wildfires and the use of energy (think of air conditioners). Both can release greenhouse gases that further drive climate change, which in turn raises temperatures and feeds other extreme weather around the globe, an ever-worsening cycle that continues to repeat.

In the United States, air pollution has improved quite a bit since the passage of the Clean Air Act in 1970. However, some air pollutant levels have risen in the last few years, and air pollution continues to have serious ongoing health impacts, both nationally and globally.

How does air pollution affect your health?

Numerous studies over the years have repeatedly shown that increased outdoor air levels of fine particulate matter correspond to increased hospitalizations for heart disease, stroke , diabetes , pneumonia, chronic obstructive pulmonary disease exacerbation , and other serious health problems. Both long-term exposure and short-term exposure seem to matter.

A study published this year looked at global models of pollution levels and risk assessments of the world population over 14 years. It ties fossil fuel combustion alone to nearly nine million premature deaths worldwide in 2018 — that's one in five deaths — including more than 350,000 in the US. Most of these deaths are due to heart attacks and strokes.

Who is especially vulnerable to the potential effects of air pollution? Anyone who is elderly, young, or pregnant, and anyone with underlying diseases such as a heart or a lung condition. Additionally, people living in low-income communities , which are often situated near industrial plants or high-traffic areas, are disproportionately affected.

What can you do to reduce the harms of pollution?

Use the air quality index (AQI) as a guide to help you. The EPA developed the AQI to measure the air quality. You can track it specifically for where you live at AirNow . When the AQI is in the unhealthy zones, try to avoid outdoor activities, especially near traffic-congested areas. Stay indoors and close the windows while using air conditioners and fans when it's hot, if possible, to keep you from getting overheated . Or, when you go outside, wear a mask: cloth masks and surgical masks may help with larger particles, but only certain masks like N95s will filter fine particles. It also helps to change your clothes upon your return home.

Be thoughtful about transportation. Think about healthier alternatives to driving whenever you can. Buy local produce, if this is an option for you, to further cut down on global shipping and transportation that contribute to air pollution. And when driving, don't idle your car (note: automatic download), which is estimated to waste three billion gallons of fuel and generate 30 million tons of the major greenhouse gas carbon dioxide per year in the US.

Change out your gas stove. When it is time for a new stove, choose induction or electric stoves over gas stoves. Induction cooktops not only avert indoor pollution, but also use the least amount of energy.

Consider using air purifiers. Although they do not remove all pollutants, they can improve indoor air quality. Choose an air purifier that has a high clean air delivery rate (CADR) matched for the size of your room.

Replace filters. Changing your air conditioner and air purifier filters regularly will improve your air quality and reduce energy use.

Promote clean, renewable energy. Whether it's opting for a 100% renewable energy plan or voting for leaders that prioritize renewable energy, taking steps to decrease fossil fuel use has the double benefit of combatting climate change and air pollution, ultimately working toward a sustainable future with a healthier planet and a healthier you.

Follow me on Twitter @wynnearmand

About the Author

Wynne Armand, MD , Contributor

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Why ocean pollution is a clear danger to human health

Professor of Natural Prosperity, Sustainable Development and Knowledge Systems, UCL

Professor and Director, Global Public Health Program and Global Pollution Observatory, Schiller Institute for Integrated Science and Society, Boston College

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Jacqueline McGlade receives funding from UKRI Global Challenges Research Fund (EPSRC)

Philip Landrigan receives funding from Center Scientifique de Monaco and the Prince Albert II de Monaco Fondation

University College London provides funding as a founding partner of The Conversation UK.

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Ocean pollution is widespread, worsening, and poses a clear and present danger to human health and wellbeing. But the extent of this danger has not been widely comprehended – until now. Our recent study provides the first comprehensive assessment of the impacts of ocean pollution on human health.

Ocean pollution is a complex mixture of toxic metals, plastics, manufactured chemicals, petroleum, urban and industrial wastes, pesticides, fertilisers, pharmaceutical chemicals, agricultural runoff, and sewage. More than 80% arises from land-based sources and it reaches the oceans through rivers, runoff, deposition from the atmosphere – where airborne pollutants are washed into the ocean by rain and snow – and direct dumping, such as pollution from waste water treatment plants and discarded waste. Ocean pollution is heaviest near the coasts and most highly concentrated along the coastlines of low-income and middle-income countries.

Ocean pollution can also be found far beyond national jurisdictions in the open oceans, the deepest oceanic trenches, and on the shores of remote islands. Ocean pollution knows no borders.

The most hazardous ocean pollution

Plastic waste is the most visible component of ocean pollution. More than ten million tonnes of plastic enter the seas every year. The majority of this breaks down into microplastic particles and accumulates in coastal and deep-sea sediments.

Some large pieces float in the water for decades ending up as massive concentrations where currents converge and circulate. The Pacific Ocean’s so called “garbage patch” is a well-known example.

Read more: It might be the world's biggest ocean, but the mighty Pacific is in peril

Microplastics contain multiple toxic chemicals that are added to plastics to make them flexible, colourful, waterproof or flame-resistant. These include carcinogens, neurotoxins, and endocrine disruptors – chemicals that interfere with hormones, and can cause cancer, birth defects, and reduced fertility.

These chemical-laden particles enter the food chain and accumulate in fish and shellfish. When humans eat seafood contaminated with these materials, we ingest millions of microplastic particles and the many chemicals they carry. Though there is still debate on the harm to humans from microplastics, exposure to these chemicals increases the risk of all the diseases that they cause. Virtually all of us have microplastics in our bodies today.

Mercury is widespread in the oceans, and the major culprit is coal burning in homes and industry . All coal contains mercury, and when it burns, mercury vaporises, enters the atmosphere, and eventually washes into the sea. Gold mining is another source , as mercury is used to dissolve gold from the ore.

Mercury can accumulate to high levels in predatory fish such as tuna and swordfish, which are in turn eaten by us. Contaminated fish can be especially dangerous if eaten by expectant mothers. Exposure of mercury to infants in the womb can damage developing brains, reducing IQ and increasing risks for autism, ADHD, and other learning disorders. Adult mercury exposure increases risks for heart disease and dementia .

Petroleum pollutants from oil spills threaten the marine microorganisms that produce much of the Earth’s oxygen by reducing their capacity for photosynthesis. These beneficial microorganisms use solar energy to convert atmospheric CO₂ into oxygen and are also affected by organic pollutants and other chemicals . When there is a major oil spill, the impact can be huge.

Coastal pollution from industrial waste, agricultural runoff, pesticides, and sewage increases the frequency of harmful algal blooms, known as red tides, brown tides, and green tides. These blooms produce powerful toxins like ciguatera and domoic acid that accumulate in fish and shellfish. When ingested, these toxins can cause dementia, amnesia, paralysis, and even rapid death. When inhaled, they can cause asthma.

Dangerous microorganisms result from a combination of coastal pollution and warming seas, which encourages their spread. Harmful bacteria such as the vibrio species – found in warmer waters and responsible for vibriosis , a potentially fatal illness – are now appearing further north and causing life-threatening infections. There’s a high risk that cholera, caused by vibrio cholerae , could spread to new, previously unaffected areas.

And the health impacts of ocean pollution fall disproportionately on indigenous peoples, coastal communities and vulnerable populations in the Global South , underlining the planetary scale of this environmental injustice.

Political will and scientific evidence

While the findings in this report are alarming, the good news is that ocean pollution, as with all forms of pollution, can be controlled and prevented. Bans on single-use plastics and better waste sorting can curb pollution at its source, especially plastic waste, both on land and at sea.

Wise governments have curbed other forms of pollution by deploying control strategies based on law, policy, technology, and targeted enforcement. The US, for example, has reduced air pollution by 70% since the passage of the Clean Air Act in 1970. They have saved thousands of lives. They have proven highly cost-effective .

Countries around the world are now applying these same tools to control ocean pollution. Boston Harbour in Massachusetts and Victoria Harbour in Hong Kong have been cleaned. Estuaries from Chesapeake Bay in the US to the Seto Inland Sea in Japan have been rejuvenated. Some coral reefs have been restored, such as those in American Samoa , where vigilance, protection and quick response have happened in relation to various pollution threats.

These successes have boosted economies, increased tourism, restored fisheries, and improved health. They demonstrate that broad control of ocean pollution is feasible and their benefits will last for centuries. Our study offers some clear recommendations for preventing and controlling ocean pollution, including transitioning to cleaner energy, developing affordable alternatives to fossil fuel-based plastics, reducing human, agricultural and industrial discharges, and expanding Marine Protected Areas .

Protecting the planet is a global concern and our collective responsibility. Leaders who recognise the gravity of ocean pollution, acknowledge its growing dangers, engage civil society, and take bold, evidence-based action to stop pollution at source will be essential for preventing ocean pollution and safeguarding our own health.

• Microplastics
• Ocean pollution
• Human health

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Your environment. your health., air pollution and your health, introduction.

Air Pollution

Air pollution is a familiar environmental health hazard. We know what we’re looking at when brown haze settles over a city, exhaust billows across a busy highway, or a plume rises from a smokestack. Some air pollution is not seen, but its pungent smell alerts you.

It is a major threat to global health and prosperity. Air pollution, in all forms, is responsible for more than 6.5 million deaths each year globally , a number that has increased over the past two decades.

What Is Air Pollution?

Air pollution is a mix of hazardous substances from both human-made and natural sources.

Vehicle emissions, fuel oils and natural gas to heat homes, by-products of manufacturing and power generation, particularly coal-fueled power plants, and fumes from chemical production are the primary sources of human-made air pollution.

Nature releases hazardous substances into the air, such as smoke from wildfires, which are often caused by people; ash and gases from volcanic eruptions; and gases, like methane, which are emitted from decomposing organic matter in soils.

Traffic-Related Air Pollution (TRAP), a mixture of gasses and particles, has most of the elements of human-made air pollution: ground-level ozone, various forms of carbon, nitrogen oxides, sulfur oxides, volatile organic compounds, polycyclic aromatic hydrocarbons, and fine particulate matter.

Ozone , an atmospheric gas, is often called smog when at ground level. It is created when pollutants emitted by cars, power plants, industrial boilers, refineries, and other sources chemically react in the presence of sunlight.

Noxious gases , which include carbon dioxide, carbon monoxide, nitrogen oxides (NOx), and sulfur oxides (SOx), are components of motor vehicle emissions and byproducts of industrial processes.

Particulate matter (PM) is composed of chemicals such as sulfates, nitrates, carbon, or mineral dusts. Vehicle and industrial emissions from fossil fuel combustion, cigarette smoke, and burning organic matter, such as wildfires, all contain PM.

A subset of PM, fine particulate matter (PM 2.5) is 30 times thinner than a human hair. It can be inhaled deeply into lung tissue and contribute to serious health problems. PM 2.5 accounts for most health effects due to air pollution in the U.S.

Volatile organic compounds (VOC) vaporize at or near room temperature—hence, the designation volatile. They are called organic because they contain carbon. VOCs are given off by paints, cleaning supplies, pesticides, some furnishings, and even craft materials like glue. Gasoline and natural gas are major sources of VOCs, which are released during combustion.

Polycyclic aromatic hydrocarbons (PAH) are organic compounds containing carbon and hydrogen. Of more than 100 PAHs known to be widespread in the environment, 15 are listed in the Report on Carcinogens . In addition to combustion, many industrial processes, such as iron, steel, and rubber product manufacturing, as well as power generation, also produce PAHs as a by-product. PAHs are also found in particulate matter.

Air Pollution and Climate Change

Air pollution and climate change affect each other through complex interactions in the atmosphere. Air pollution is intricately linked with climate change because both problems come largely from the same sources, such as emissions from burning fossil fuels. Both are threats to people’s health and the environment worldwide. Read more: Health Impacts of Air Quality .

What is NIEHS Doing?

Over its 50-plus year history, NIEHS has been a leader in air pollution research. The institute continues to fund and conduct research into how air pollution affects health and the population groups who are most affected.

How does air pollution affect our health?

When the National Ambient Air Quality Standards were established in 1970, air pollution was regarded primarily as a threat to respiratory health. In 1993, NIEHS researchers published the landmark Six Cities Study , which established an association between fine particulate matter and mortality.

Air pollution exposure is associated with oxidative stress and inflammation in human cells, which may lay a foundation for chronic diseases and cancer. In 2013, the International Agency for Research on Cancer of the World Health Organization (WHO) classified air pollution as a human carcinogen .

Many studies have established that short-term exposure to higher levels of outdoor air pollution is associated with reduced lung function, asthma, cardiac problems, emergency department visits, and hospital admissions . Mortality rates related to air pollution are also a concern. Exposure to the air pollutant PM2.5 is associated with an increased risk of death .

A team of researchers, partially funded by NIEHS, found that deaths decreased after air pollution regulations were implemented and coal-powered plants were retired. The study data covered 21 years. More specifically, they found exposure to PM2.5 from coal was associated with a mortality risk that was twice as high as the risk from exposure to PM2.5 from all sources. PM2.5 from coal is high in sulfur dioxide, black carbon, and metals.

Public health concerns related to high air pollution exposures include cancer, cardiovascular disease, respiratory diseases, diabetes mellitus, obesity, and reproductive, neurological, and immune system disorders.

Research on air pollution and health effects continually advances.

• A large study of more than 57,000 women found living near major roadways may increase a woman’s risk for breast cancer .
• Occupational exposure to benzene, an industrial chemical and component of gasoline, can cause leukemia and is associated with non-Hodgkin’s Lymphoma .
• A long-term study, 2000-2016, found an association between lung cancer incidence and increased reliance on coal for energy generation.
• Using a national dataset of older adults, researchers found that 10-year long exposures to PM2.5 and NO2 increased the risks of colorectal and prostate cancers .

Cardiovascular Disease

• Fine particulate matter can impair blood vessel function and speed up calcification in arteries .
• NIEHS researchers established links between short-term daily exposure by post-menopausal women to nitrogen oxides and increased risk of hemorrhagic stroke .
• For some older Americans, exposure to TRAP can result in lowered levels of high-density lipoprotein , sometimes called good cholesterol, increasing their risk for cardiovascular disease.
• According to a National Toxicology Program (NTP) report , TRAP exposure also increases a pregnant woman’s risk for dangerous changes in blood pressure, known as hypertensive disorders, which are a leading cause of pre-term birth, low birth weight, and maternal and fetal illness and death.

Respiratory Disease

• Air pollution can affect lung development and is implicated in the development of emphysema , asthma, and other respiratory diseases, such as chronic obstructive pulmonary disease (COPD).
• Increases in asthma prevalence and severity are linked to urbanization and outdoor air pollution. Children living in low-income urban areas tend to have more asthma cases than others. Research published in 2023 tied two air pollutants, ozone and PM2.5, to asthma-related changes in children’s airways.
• In a study of 50,000 women across the country, long-term exposure to PM2.5, PM10, and nitrogen dioxide were linked to chronic bronchitis .
• In 2020, a major public health challenge was confluence of the COVID-19 pandemic and wildfires across the western U.S. Building on a well-established connection between air pollution and respiratory-tract infections, a study linked exposure to wildfire smoke with more severe cases of COVID-19 and deaths .

Whom does air pollution affect the most?

Air pollution affects everyone’s health, but certain groups may be harmed more. Almost 9 out of 10 people who live in urban areas worldwide are affected by air pollution.

NIEHS-funded research indicates there are racial or ethnic and socioeconomic disparities in air pollution emissions. Air pollution emissions have decreased over past decades but the changes vary by demographics . This research found that people with annual incomes above $70,000 generally experience greater declines in industry, energy, transportation, residential, and commercial-related emissions than do people with lower incomes.

The NIEHS-funded Children’s Health Study at the University of Southern California is one of the largest studies of the long-term effects of air pollution on children’s respiratory health. Among its findings:

• Higher air pollution levels increase short-term respiratory infections, which lead to more school absences.
• Children who play several outdoor sports and live in high ozone communities are more likely to develop asthma.
• Children living near busy roads have an increased chance of developing asthma.
• Children who were exposed to high levels of air pollutants were more likely to develop bronchitis symptoms in adulthood .
• Living in communities with higher pollution levels can cause lung damage .

Other studies on women and children

• Breathing PM 2.5, even at relatively low levels, may alter the size of a child's developing brain , which may ultimately increase the risk for cognitive and emotional problems later in adolescence.
• In a large-scale study that looked at more than 1 million birth records, prenatal PM2.5 exposure was associated with an increased risk of cerebral palsy . While this finding adds to knowledge about environmental risk factors for cerebral palsy development and how to reduce the chance of it developing, further studies are needed. Prenatal exposure to PAHs was associated with brain development effects, slower processing speed, attention-deficit and hyperactivity disorder (ADHD) symptoms, and other neurobehavioral problems in urban youth .
• Prenatal exposure to air pollution may play a role in the development of ADHD-related behavior problems in childhood.
• Prenatal exposure to particulate matter was associated with low birth weight .
• Women exposed to high levels of fine particulate matter during pregnancy, particularly in the third trimester, may have up to twice the risk of having a child with autism .
• Second and third trimester exposure to PM2.5 might increase the chance of those children having high blood pressure in early life .
• A large study of more than 300,000 women found long-term exposure to air pollution, especially ozone and PM2.5, during and after pregnancy increases the risk of postpartum depression .
• The study with data on more than 5 million babies assessed associations between prenatal exposure to wildfire smoke and the risk of preterm birth. The researchers found that exposure to high levels of wildfire particulate matter during any period of pregnancy was associated with a greater chance of preterm birth .

Older adults

• Alzheimer’s disease and related dementias are a public health challenge for aging populations. NIEHS-funded researchers at the University of Washington identified a link between air pollution and dementias. This well-conducted study adds considerable evidence that ambient air fine particles increase risk of dementias . Conversely, a multi-year study published in 2022 shows improved air quality is associated with lower risk of dementia in older women. The researchers also stated this decline in dementia risk was equivalent to taking nearly 2 1/2 years off the age of the women studied.
• A large, nationally representative study looked at PM2.5 from many sources and incident dementia. Emissions from agriculture, traffic, coal combustion, and wildfires, in particular, were associated with increased rates of dementia .
• Air pollution was linked to a greater chance of developing several neurological disorders , including Parkinson's disease, Alzheimer's disease, and other dementias. Hospital admissions data from 63 million older adults in the U.S., obtained over 17 years (2000-2016), was analyzed along with estimated PM2.5 concentrations by zip code to conduct the study. Another study with data from 10-year long exposures also found a relationship between CO and PM2.5 and an increased chance of developing Parkinson’s disease .
• Osteoporosis affects women more than men. A large study associated high levels of air pollutants with bone damage , particularly in the lumbar spine, among postmenopausal women. This study expands previous findings linking air pollution and bone damage.
• Nutrients may counter some harmful effects from air pollution. A 2020 study found omega-3 fatty acids , obtained by eating certain fish, may protect against PM2.5-associated brain shrinkage in older women.

Rural dwellers

• NIEHS supported a translational research project,  Addressing Air Pollution and Asthma (1MB) , that may lead to improved health for children suffering from asthma. They found that certain agricultural practices contribute to poor air quality and asthma among children. The team combined high-efficiency particulate air (HEPA) cleaners and a home-based education program to reduce children’s exposure to pollutants in the home.
• Exposure to smoke from agricultural burns for as little as two weeks per year may worsen children's respiratory health outcomes, according to research supported by NIEHS. The study was conducted in response to community concerns about children's heath in Imperial Valley, a rural, agricultural area in southern California. Such agricultural burning is done to clear post-harvest crop remnants. This form of clearing is inexpensive, and farmers in the area do not have other economical methods for disposing of waste.
• In the rural U.S., large-scale animal feeding operations might compromise regional air quality through emission of pollutants, such as ammonia gas. A study found acute lung function problems in children with asthma in such areas.

NIEHS and community involvement

NIEHS supports community participation in the research process and encourages collaborative approaches that build capacity in communities to address environmental health concerns. Community-engaged research and citizen science are two types of collaborative research approaches.

For example, NIEHS grant recipients developed community-level tactics and public policies for reducing exposure to TRAP:

• Using high-efficiency particulate air (HEPA) filtration.
• Building land-use buffers and vegetation barriers.
• Improving urban design with gardens, parks, and street-side trees.
• Creating active-travel options, such as bicycling and walking paths.

Why improving air quality matters

• Air pollution and birth outcomes are linked as global public health concerns. Researchers analyzed indoor and outdoor air pollution data from all inhabited continents along with key pregnancy outcomes. Their findings indicate efforts to reduce PM2.5 exposure could lead to significant reductions in the number of low-birth weight and pre-term birth infants worldwide . Air pollution reduction would be especially beneficial for children born in low- and middle-income countries.
• Among children in Southern California, decreases in ambient nitrogen dioxide and PM 2.5 were associated with fewer cases of asthma .
• Bronchitis symptoms declined as pollution levels dropped in the Los Angeles region.
• Improving air quality may improve cognitive function and reduce dementia risk, according to studies supported in part by NIH and the Alzheimer's Association.
• When fossil-fuel power plants close, nearby air pollution is reduced. A study found the incidence of preterm births went down within 5 kilometers of retired coal and oil-powered plant locations.

Further Reading

Stories from the environmental factor (niehs newsletter).

• Wildfire Smoke: Effects on Male Fertility, Offspring Studied by Expert (August 2024)
• Air Pollution May Trigger DNA Modifications Tied to Alzheimer’s Disease (April 2024)
• Scientific Journeys: Using AI to Track a Major Source of Pollution (March 2024)
• Burn Pits’ Complex Emissions Simulated in NIEHS Grantee’s Laboratory (December 2023)
• Indoor Wood-burning May Be Linked to Lung Cancer in U.S. Women (September 2023)
• Everyday Air Pollution Can Harm Brain Development in Adolescents (September 2023)
• Wildfire Smoke, Other Air Pollution Can Harm Brain Health, Expert Says (August 2023)
• Burning Plastic Can Affect Air Quality, Public Health (August 2022)
• Interventions Needed to Slow Climate-driven Air Pollution, Researchers Note (March 2022)
• Air Pollution and Forever Chemicals Continue to Pose Health Risks (March 2022)
• Air Pollution Affects Children’s Brain Structure (February 2022)
• Increasing Evidence Links Air Pollution With Breast Cancer (November 2021)
• Fine Particulate Air Pollution Associated With Higher Dementia Risk (September 2021)

Printable Fact Sheets

Fact sheets.

Breast Cancer: Why the Environment Matters

Climate Change and Human Health

Lung Health and Your Environment

Partnerships for Environmental Public Health (PEPH)

• When Wildfires Hit Close to Home is about NIEHS-funded research on the complexity of urban wildfires and how they may affect human health.
• Wildfire Smoke and Children's Health

Additional Resources

• Air Pollution Linked to Dementia Cases (September 2023) – In this edition of NIH Research Matters, read about findings from the Health and Retirement Study, funded by the National Institute on Aging, that showed higher air pollution exposure was linked to an increased risk of dementia. After consideration of all sources, fine particulate matter, or PM2.5, from agriculture and wildfires were specifically associated with an increased risk of dementia. Reducing such exposures might help lower the incidence of dementia. The study was published in JAMA Internal Medicine.
• AirNow , a tool developed in partnership by several government agencies, allows you to monitor air quality in real time anywhere in the U.S. Simply enter your zip code as indicated on the website.
• EPA's Air Sensor Toolbox provides information on the operation and use of air-sensor monitoring systems for technology developers, air-quality managers, citizen scientists, and the public.
• NIH Climate Change and Health Initiative – This solutions-focused research initiative aims to reduce the health consequences associated with extreme weather events and evolving climate conditions. NIH has a strong history of creating innovative tools, technologies, and data-driven solutions to address global environmental problems.
• Smoke-ready Toolbox for Wildfires is a compendium of resources from the EPA to help educate you about the risks of smoke exposure and actions that protect your health.

Related Health Topics

• Exposure Science
• Gene and Environment Interaction
• Lung Diseases

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Five reasons you should care about air pollution

Air pollution is all around us. Indoors, outdoors, in cities and in the countryside. It affects us all, whether we realize it or not. For the longest time, we have taken the air we breathe for granted. There was air, there were smells, there was cold wind, there was hot air.

But recent research has started to shed light on some rather worrisome aspects of what the air around us really contains, and how it affects our bodies. And the more we learn, the more we come to realize that this essential source of life for the planet needs some serious taking care of. Without air there can be no life but breathing polluted air condemns us to a life of disease and early death.

Now that we know how air pollution harms us, there is no excuse not to act. Below are five great reasons to reduce and eliminate air pollution from our lives.

Polluted air is creating a health emergency

There is no doubt today that air pollution is a global public health emergency. It threatens everyone from unborn babies to children walking to school, to women cooking over open fires.

On the street and inside the house, the sources of air pollution can be very different, yet their effects are equally deadly: asthma, other respiratory illnesses and heart disease are among the adverse health effects known to be caused by polluted air.

According to the World Health Organization, every year around 7 million premature deaths are attributable to air pollution—a staggering 800 people every hour or 13 every minute. Overall, air pollution is responsible for more deaths than many other risk factors, including malnutrition, alcohol use and physical inactivity.

Children are most at risk

Globally, 93 per cent of all children breathe air that contains higher concentrations of pollutants than the World Health Organization (WHO) considers safe to human health. As a result, 600,000 children die prematurely each year because of air pollution. As if that were not enough, exposure to dirty air also harms brain development, leading to cognitive and motor impairments, while at the same time putting children at greater risk for chronic disease later in life.

Household air pollution is particularly harmful to women and children due to their traditional home-based roles in many cultures. About 60 per cent of household air pollution-related deaths globally are among women and children, and more than half of all pneumonia deaths in children under five can be attributed to indoor air pollution.

Pollution and poverty go hand in hand

Air pollution goes to the heart of social justice and global inequality, disproportionately affecting poor people.

In homes, air pollution comes mostly from fuels and high-emitting heating and cooking systems. Clean cooking and heating fuels and technologies are out of reach for low-income families, so polluting alternatives are the norm. About 3 billion people depend on burning solid fuels or kerosene to meet household energy needs and 3.8 million of them will die each year from exposure to these pollutants. A lack of awareness of the risks associated with breathing polluted air also contributes to the problem, as well as the cost and difficulty to access healthcare.

Crowded cities and trafficked suburbs are hotspots for outdoor air pollution. According to the World Health Organization, 97 per cent of cities in low- and middle-income countries with more than 100,000 inhabitants do not meet the minimum air quality levels. Around 4 million of the approximately 7 million people who die from air pollution-related diseases every year live in the Asia-Pacific region.

In high-income countries, 29 per cent of cities fall short of meeting the organization’s guidelines. But in those countries, too, poorer communities are often those most exposed—power plants, factories, incinerators and busy roads are often located in or near poor suburban communities.

The cheaper the fuels, the higher the costs

When people get sick, the entire community suffers. Ill people require medical care and medicine, children skip school and working adults miss days of work, either as a result of their own poor health, or to care for a loved one. According to the World Bank, air pollution costs the global economy more than US$5 trillion every year in welfare costs and $225 billion in lost income.

A 2016 study by the Organisation for Economic Cooperation and Development predicts that, if the situation remains unchanged, by 2060 the annual global welfare costs of premature deaths from outdoor air pollution would be US$18-25 trillion, with the costs of pain and suffering from illness estimated at around US$2.2 trillion.

There are other less direct costs, which nonetheless affect us globally. Ground-level ozone is expected to reduce staple crop yields by 26 per cent by 2030, creating food security and nutrition challenges. Air pollution also degrades materials and coatings, decreasing their useful life and generating costs for cleaning, repair and replacement.

UN Environment’s sixth Global Environment Outlook estimates that climate mitigation actions for achieving the Paris Agreement targets would cost about US$22 trillion. Meanwhile, by reducing air pollution, we could save US$54 trillion in combined health benefits. The math is clear: acting now against air pollution translates into saving US$32 trillion.

The right to clean air is a human right

The right to a healthy environment enjoys constitutional status—the strongest form of legal protection available—in more than 100 countries. At least 155 states are legally obligated, through treaties, constitutions and legislation, to respect, protect and fulfil the right to a healthy environment.

The right to clean air is also embedded in the Universal Declaration of Human Rights and the International Covenant on Economic, Social and Cultural Rights, and fully enshrined in the Sustainable Development Goals—the global blueprint for peace and prosperity.

Ready to take action?

Find out what you can do to involve your business, school and families. And call on your government to enforce the World Health Organization guidelines for ambient and indoor air quality.

Remember, clean air is your right!

Air pollution is the theme for  World Environment Day  on 5 June 2019. The quality of the air we breathe depends on the lifestyle choices we make every day. Learn more about how air pollution affects you, and what is being done to clean the air. What are you doing to reduce your emissions footprint and  #BeatAirPollution ?

The 2019 World Environment Day is hosted by China.

For further information please contact Hao Chen

• Air quality

Further Resources

• How air pollution is destroying our health
• State of Global Air 2019
• More than 90% of the world’s children breathe toxic air every day
• 3.8 million deaths are attributed to household air pollution annually
• Air Pollution Deaths Cost Global Economy US$225 Billion
• The Economic Consequences of Outdoor Air Pollution

Related Content

Related Sustainable Development Goals

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Essay on Air Pollution for Students and Children

500+ words essay on air pollution.

Essay on Air Pollution – Earlier the air we breathe in use to be pure and fresh. But, due to increasing industrialization and concentration of poisonous gases in the environment the air is getting more and more toxic day by day. Also, these gases are the cause of many respiratory and other diseases . Moreover, the rapidly increasing human activities like the burning of fossil fuels, deforestation is the major cause of air pollution.

How Air Gets Polluted?

The fossil fuel , firewood, and other things that we burn produce oxides of carbons which got released into the atmosphere. Earlier there happens to be a large number of trees which can easily filter the air we breathe in. But with the increase in demand for land, the people started cutting down of trees which caused deforestation. That ultimately reduced the filtering capacity of the tree.

Moreover, during the last few decades, the numbers of fossil fuel burning vehicle increased rapidly which increased the number of pollutants in the air .

Causes Of Air Pollution

Its causes include burning of fossil fuel and firewood, smoke released from factories , volcanic eruptions, forest fires, bombardment, asteroids, CFCs (Chlorofluorocarbons), carbon oxides and many more.

Besides, there are some other air pollutants like industrial waste, agricultural waste, power plants, thermal nuclear plants, etc.

Greenhouse Effect

The greenhouse effect is also the cause of air pollution because air pollution produces the gases that greenhouse involves. Besides, it increases the temperature of earth surface so much that the polar caps are melting and most of the UV rays are easily penetrating the surface of the earth.

Get the huge list of more than 500 Essay Topics and Ideas

Effects Of Air Pollution On Health

Moreover, it increases the rate of aging of lungs, decreases lungs function, damage cells in the respiratory system.

Ways To Reduce Air Pollution

Although the level of air pollution has reached a critical point. But, there are still ways by which we can reduce the number of air pollutants from the air.

Reforestation- The quality of air can be improved by planting more and more trees as they clean and filter the air.

Policy for industries- Strict policy for industries related to the filter of gases should be introduced in the countries. So, we can minimize the toxins released from factories.

Use of eco-friendly fuel-  We have to adopt the usage of Eco-friendly fuels such as LPG (Liquefied Petroleum Gas), CNG (Compressed Natural Gas), bio-gas, and other eco-friendly fuels. So, we can reduce the amount of harmful toxic gases.

To sum it up, we can say that the air we breathe is getting more and more polluted day by day. The biggest contribution to the increase in air pollution is of fossil fuels which produce nitric and sulphuric oxides. But, humans have taken this problem seriously and are devotedly working to eradicate the problem that they have created.

Above all, many initiatives like plant trees, use of eco-friendly fuel are promoted worldwide.

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Negative Effects of Pollution

Effects of Car Pollutants on the Environment

The whole world needs to know about pollution and take steps to reduce it, because the negative effects of pollution are serious and potentially fatal. All types of pollution are detrimental to human health and wildlife and contribute to climate change, which puts the entire planet in danger. Knowledge is power, so learning about the effects of pollution is crucial to make changes for the better.

TL;DR (Too Long; Didn't Read)

Air, soil and water pollution contribute to climate change and have a negative impact on human health. Pollutants also endanger many plant and animal species.

Effects of Air Pollution

Greenhouse gases, like fossil fuels released by vehicles and factories, and methane, released by livestock, contribute to air pollution and add to climate change by raising the earth's temperature. In a vicious circle, climate change then makes a certain type of air pollution worse. A reaction between combusting fossil fuel emissions and sunlight creates smog, a yellowish or blackish fog also known as "ground level ozone." Climate change also creates more allergenic air pollutants, such as mold caused by damp conditions and pollen caused by a longer pollen season and increased pollen production.

Air pollution can have a serious heath impact on humans. If you are exposed to very high levels of air pollutants, you may experience irritation of the eyes, nose and throat, wheezing, coughing and breathing problems and have a greater risk of heart attacks. Air pollution can also exacerbate existing lung and heart conditions, like asthma. Smog can irritate the eyes and throat and also damage the lungs. Children, senior citizens and people who work or exercise outside are at a greater risk. Those most at risk are people with asthma or allergies because pollutants can make their symptoms worse and trigger asthma attacks.

Across the world, climate change leads to more drought, heat waves, rising sea levels, storms, warming oceans and rising sea levels, which affect animal species by destroying their natural habitats.

Effects of Soil Pollution

Pollutants in soil, most often from industrial sources, deforestation and improper waste disposal, put animals and plants in danger. Soil polluted by chemicals eventually becomes infertile and unable to support crops and other plant life. This hinders food production and can lead to malnourishment in local communities. If soil pollutants produce contaminated food, anyone who eats it may become ill. Toxic soil may also cause illness through skin contact or inhalation.

Effects of Water Pollution

Pollutants in water resulting from trash, oil spills, sewage spills and run-off from agricultural fields, construction sites and factories affect native plant and animal species. Drinking contaminated water caused by sewage overflow may cause sickness and digestive problems in humans. Pollutants such as mercury in fish and seafood can lead to serious health problems, especially in children and pregnant women.

When water is poisoned, many animals die. Six months after the 2010 BP oil spill, which affected 16,000 miles of U.S. coastline, over 8,000 animals were reported dead. Animals are also often injured or killed by solid waste discarded in water.

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• Massachusetts Department of Environmental Protection: Health & Environmental Effects of Air Pollution
• United States Environmental Protection Agency: Overview of Greenhouse Gases
• NRDC: Air Pollution: Everything You Need to Know
• WWF: Effects of Climate Change
• DoSomething.org: 11 Facts About the BP Oil Spill

About the Author

Claire is a writer and editor with 18 years' experience. She writes about science and health for a range of digital publications, including Reader's Digest, HealthCentral, Vice and Zocdoc.

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How Bad Are Plastics, Really?

They’re harmful to health, environment, and human rights—and now poised to dominate this century as an unchecked cause of climate change.

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T his is hardly the time to talk about plastics is what I think when Dad, hovering over the waste bin at a post-funeral potluck, waves me over, his gesture discreet but emphatic. He has retrieved from the trash a crystalline plastic cup, with fluted, rigid sides. “Polystyrene,” he grins, inverting the cup to reveal its resin code (a 6 stamped inside the recycling symbol). “But not my kind .”

Dad, back in the 1960s, had manufactured a more resilient variety of polystyrene for Union Carbide, one of the 20th century’s major plastics manufacturers, since acquired by Dow Chemical Company. Now, in the parish hall, I recognize he is seconds from crushing the cup. As if on cue, he closes his grip. Being a certain type of polystyrene—and this is his point—the cup splinters into a strange bloom of shards arrayed about the cup’s circular bottom.

No butadiene , I think. “No butadiene,” he says, which, on the production lines he ran, had been added to rubberize the resin, one among 10,000 helpmates that make plastics as we know them possible. Dad shuffles off to find the recycling bin, though he knows the cup has little chance for recovery and likely a long afterlife ahead. This is especially true for polystyrenes, of which there are multiple varieties; plastics, as the anthropologist Tridibesh Dey notes , are a chemically complex lot, designed for performance rather than reclamation.

Dad once believed that plastics could be reused indefinitely. I imagine that, maybe, he thought plastics, like their makers, deserved the chance to begin again. When Union Carbide downsized in the 1970s, Dad took severance and stayed home with my siblings until he could figure out what a life beyond plastics might look like. The answer, it turned out, was public administration: For a time, he ran my hometown’s recycling program. Recycling, though, never lived up to Dad’s ideal. Of all the plastics made over his lifetime, less than 10 percent has been effectively repurposed.

This failure, like so many other aspects of our relationship with plastics, is often framed in terms of individual shortcomings ; plastics’ producers, or the geopolitics that have made plastics so widespread, are rarely called out. But to read plastics’ history is to discover another story: Demand for plastic has been as manufactured as plastics themselves. Society is awash in throwaway plastics not because of the logic of desire but because of the logic of history and of integrated industrial systems.

For decades, the industry has created the illusion that its problems are well under control, all while intensifying production and promotion. More plastics have been made over the past two decades than during the second half of the 20th century. Today, recycling is a flailing, failing system—and yet it is still touted as plastics’ panacea. No end-of-the-pipe fix can manage mass plastics’ volume , complex toxicity , or legacy of pollution , and the industry’s long-standing infractions against human health and rights .

All of this has been true for years, but if there is a time to talk about plastics, now might be it. Plastics are poised to dominate the 21st century as one of the yet-unchecked drivers of climate change.

W hen Dad’s former employer started making plastics in the late 1920s, no market was itching to buy them. But the company, in a sense, had to make plastics.

Its new commercial antifreeze, Prestone, was synthesized from natural gas and created a by-product, ethylene dichloride, a chemical that had no practical purpose and so was stockpiled on-site. Quickly, it amassed in unmanageable, “embarrassing” quantities, as one Carbide newsletter later put it. Its best use, the company decided, was in making vinyl chloride monomer, recognized as a carcinogen since the ’70s, but back then a building block for a rascally class of plastics no one had commercialized yet—vinyls.

This isn’t an isolated example, but rather an illustration of how product development often unfolds for chemicals and plastics. For Carbide and other 20th-century petrochemical firms, each product required a series of multistep reactions, and each step yielded offshoots. Develop these, and the product lines further branch, eventually creating a practically fractal cascade of interrelated products. Everything that enters the system, explains Ken Geiser, an industrial-chemicals-policy scholar, in his book Materials Matter , must eventually go somewhere; matter being matter, it is neither created nor destroyed. And so it must be converted: made into fuel, discarded as pollution, or monetized. After many iterations, Carbide arrived at Vinylite, finally made workable by blending two types of vinyls: polyvinyl chloride (PVC) and polyvinyl acetate.

According to an internal marketing report, Carbide spent years trying to “synthesize” new customers and invent new uses for Vinylite, while a credit department eased the financial burden of adopting it. The company even sent technical teams around the country to teach manufacturers how to use the resin, all with limited success. Celluloid, before Bakelite, and polystyrene afterward, had similar troubles gaining purchase.

Then World War II erupted. War contracts expedited the development of emerging resins. For example, the U.S. Navy helped DuPont and Union Carbide secure a license from Britain’s Imperial Chemical Industries to begin manufacturing polyethylene for insulating wire and cable (enabling radar). The Manhattan Project spurred DuPont to industrialize its new fluorinated plastic, what would become Teflon, previously produced in batches measured by the gram rather than the ton. The war also matured existing resins: 32 times more polystyrene was being produced at the war’s end than at its outset.

But polystyrene also shared base ingredients with another material crucial to modern, mechanized warfare—styrene-butadiene rubber, or SBR. Rubber made up tank treads. Bomber tires. The soles of the boots that soldiers wore.

Germany’s colossal IG Farben had already been synthesizing Buna S rubber, its coal-derived version of SBR, when disruption of the natural-rubber trade forced the U.S. to catch up. One American alternative, GR-S, or Government Rubber-Styrene, was developed in a crash course of research and development, wrote the historian Peter J. T. Morris , that rivaled the race for the atom bomb. To keep pace with wartime rubber demand, styrene was produced at levels that seemed “ almost unbelievable ,” reads a Dow advertisement from the 1940s, especially considering how hard it had been to make previously.

Styrene, too, came with risks. Like vinyl chloride monomer, it has the potential to cause cancer . The same was true with synthetic rubber’s other main ingredient: butadiene, yet another monomer later found to be carcinogenic , and a chemical emblematic of how once-discrete industries—petroleum and chemicals—fused into the petrochemical sector.

The U.S. found itself caught between two ways of making butadiene. One involved making the chemical from grain alcohol, the other from petroleum. Oil interests vied with the farm bloc over government contracts to feed the new rubber machine. Grain held its own during the war, but afterward, the federally backed petroleum boom routed any possibility of a carbohydrate-dominated chemical-and-plastics industry. Grain harvests were deemed too irregular, too beholden to the seasons, to floods and droughts, and thus to price fluctuations.

By the 1950s, the government had sold its wartime rubber factories to private interests. Styrene, as Dow advertised, received its “honorable discharge” so it could “serve a world at peace.” Multiple firms, including Union Carbide, could now make styrene and butadiene in quantities that exceeded what a peacetime rubber industry could consume. The outlet for excess styrene: more polystyrene, some portion of which would later be modified into high-impact grades. Dad’s kind of polystyrene .

P lastics’ postwar “domestication occurred unevenly, by fits and starts,” the cultural historian Jeffrey Meikle writes in his book American Plastic . To whip up demand, the industry as a whole invested heavily in advertising, in fact becoming one of advertising’s biggest clients. At first, it set its sights on women, to teach them plastics’ advantages and how to pronounce what the Society of the Plastics Industry (SPI) admits were their “jaw-breaker” names. (“Polly and Vinny Who?” reads one 1953 pamphlet the SPI co-published with the women’s magazine McCall’s . Why it’s: “ Vine -ills and Polly- sty -rene.”) When the industry couldn’t invent new markets with, for example, the Tupperware party , it pushed into established ones by underbidding leather, cotton, glass, and metals. Still, sales were such that, by the mid-1950s, as the plastics scholar Max Liboiron has explained , the industry looked for growth by moving plastics not into homes but through them. The rosy future of plastics was in disposables—or as Modern Packaging Magazine ’s editor, Lloyd Stouffer, put it, “ in the trash can ”—and polystyrene was one of the go-to resins.

Soon Scott placed a series of ads in Life magazine featuring what the company called the first throwaway “‘glass’ nice enough for entertaining.” The cup, made from “pure porcelain-smooth polystyrene” was, the copy promised, “absolutely, positively, guaranteed disposable.” By the 1960s, the era my dad made plastics, the military was buying polystyrene again, this time to manufacture the incendiary napalm-B , but packaging and single-use applications were becoming plastics’ largest markets. Production rates were headed “up and up with a vengeance,” wrote an analyst whose sentiments were entered into the 1971 congressional record. At the grocery store, plastics picked off paper item by item: the egg carton, the bread bag, the meat tray, and, eventually though not easily, the grocery sack, says the science writer Susan Freinkel in her book Plastic: A Toxic Love Story .

“Consumers,” Meikle explains, “could choose only from among goods presented in the marketplace.” And by the closing decades of the 20th century, what was on offer was plastic.

I n my office , polystyrene cups of many shapes, sizes, grades, and hues line my bookshelf. All were gifts from Dad, who has the admittedly obscure habit of bringing them over. To toss them feels unbearable, and recycling, uncertain .

It can be hard to visualize the web that connects commonplace cups to the interlocking global crises of toxics, environmental injustice, and climate change, and even harder to locate where to intervene. True, some plastics make goods and vehicles more lightweight and thereby efficient. And plastic components help make up technologies that capture and distribute renewable energy . But by comparison, more than 40 percent of plastics now goes into containers, cups, packaging, and other short-term-use products. Despite encouragements to refuse disposables when possible and to #bringyourown, most people in most cases have little say over the volume of plastic packaging in their lives. In some places, a sizable proportion of discardable plastics (for example, sachets ) has become largely unavoidable, especially in rural and remote regions where alternatives can be either inaccessible or unaffordable.

Moreover, plastics’ ubiquity isn’t always that visible. Google can lining and drain cleaner and watch for yourself how, once a soda or beer can is submerged in drain cleaner, the cleaner digests the metal layer, leaving a clear, plastic sleeve behind. Or better yet: Soak your next takeout paper coffee cup in a bowl of water . The paper will slough off, revealing the thin layer of polyethylene within.

B y the early 1970s , 15 states were already considering how to limit the rapid proliferation of plastic containers. The industry shifted from promotion to self-defense . Industry groups stymied New York City’s attempt at a two-cent bottle tax, and in the following decade beat back restrictions in nearby Suffolk County on polystyrene cups and other tossable plastics. Industry trade groups have even lobbied for states to preempt bans on plastic bags . And whenever public-opinion polls suggested slippage, or if the threat of public regulations loomed, industry and its trade associations upped their ad buys .

At no other juncture in its history, though, has plastics faced the scrutiny it does now. This past March, two Democratic members of Congress introduced legislation to address plastic pollution. At least two-thirds of United Nations member states (including, recently, the United States ) support negotiations toward a binding treaty to address plastics’ global implications. And this month, the National Academies of Sciences, Engineering, and Medicine called on U.S. producers to reduce the volume of plastics entering commerce and, by extension, the environment. Even my dad has been involved in a push to introduce a municipal ban on disposable polystyrene.

All of these efforts call into question plastics’ unfettered production, but there’s another reason, too, to address plastics now—the industry’s carbon-intensive production is driving climate change .

P lastics has been an adaptable industry, at first forming products from raw materials such as gutta-percha and wood pulp, and then from other industries’ discards, including cotton linters, agricultural waste, and the remnant gases emitted from city gas plants or steel’s coal-to-coke ovens. Plastics are now made in a highly integrated network of refineries, crackers, and petrochemical plants—complexes that have been retrofitted or relocated to better tap new or different oil and gas deposits. Today, 98 to 99 percent—that is to say, most plastics—are manufactured from fossil fuels.

Historically, fossil-carbon feedstocks have been something of a distorted market, given the number and variety of government subsidies: assistance with technology transfer , tax breaks , grants, soft loans, price controls , and, as described here, wartime contracts—which has shaped plastics’ pricing and production in turn. The plastics industry hasn’t had to account for the true costs of its operations , either, including the price of what it has burned, drummed, dumped, lagooned, landfilled, injected, spilled, incinerated, sent up the stack, or drained out the outfall pipe.

But the nature of petrochemicals issued its own economic imperative. Plastics had to be a high-volume product to recoup the substantial capital investments necessary to build and then operate such complex facilities, among the largest, most expensive, and most energy-intensive in the process and manufacturing sectors. Yet again, the same problem: more plastics that need more uses and more markets.

The U.S. “ fracking boom ,” or what’s been called the “shale revolution,” has fueled plastics’ most recent expansion. Fracking has made the U.S. the world’s largest producer of oil and gas, resulting in “a glut,” Kathy Hipple , a senior research fellow at the Ohio River Valley Institute, told me. This oversupply of feedstock drove another round of investments in plastics plants, which in turn, Hipple explained, has forced an excess of plastic packaging onto the market—more than demand can absorb. These plastics, now primarily polyethylenes and polypropylenes made from natural-gas liquids, have reduced polystyrene to a minor player in the packaging and disposables market—about 2 percent . Tongue in cheek, I’ve taken to calling plastics’ latest output “frackaging.”

But the economics of plastics is once again changing. As energy and transportation shift away from fossil fuels, plastics seem to many oil and gas producers like one of the few opportunities to keep growing, to keep going. Some new “mega-plants,” such as China’s Zhoushan Green Petrochemical Base , convert crude oil, rather than refinery by-products, directly into chemicals and plastics.

And this is (partly) how plastics would come to produce a greater share of the world’s carbon emissions. Should U.S. plastics production continue to grow as the industry projects, by 2030, it will eclipse the climate contributions of coal-fired power plants, concludes Jim Vallette, the lead author of a new Beyond Plastics report . Or, by another measure , the current growth trajectory means that by 2050, the industry’s emissions could eat up 15 percent, and potentially more, of the global carbon budget. How much varies by feedstock and type of plastic, but on average, 1.89 metric tons of carbon-dioxide equivalents (a composite measure of greenhouse gases) is produced for every metric ton of plastic made.

Emissions stem from upstream fossil-fuel production and processing. But there are concerns, too, about the potential for even more emissions at the other end of the life cycle , should states green-light industry proposals to expand such carbon-intensive waste-management technologies as incineration, refuse-derived fuels , and molecular, chemical, and so-called advanced recycling. These unproven technologies use high heat and other methods to convert waste into feedstocks for making more plastics. As of now, such technologies shift “the landfill from the ground to the sky ,” says Yobel Novian Putra, who works on Asia Pacific climate and energy policy for the Global Alliance for Incinerator Alternatives, which in turn has implications for both air quality and climate.

But petrochemical production itself is also energy-intensive—among the top- two energy users in the manufacturing sector. Even if the industry were to convert to low-carbon energy sources ( or to adopt problematic carbon-capture-and-storage, or CCS, technologies ), plastics would remain a significant emitter of climate-relevant gases, according to analysts from the Center for International Environmental Law (CIEL).

Yet to date, climate policy has not focused on manufacturing or plastics . And too often plastics’ proliferation can seem of secondary importance as climate disasters accelerate. But plastics and climate aren’t separate issues. They are structurally linked problems, and also mutually compounding , with plastics’ facilities spewing climate-relevant emissions and extreme weather further dispersing plastic into the environment. Research is under way to study their interaction—the way, say, thermal stress affects how species respond to toxic exposures. But they have the same root. “Plastic is carbon,” fossil fuels in another form, CIEL’s president, Carroll Muffett, told me. Or, as the geographer Deirdre McKay phrases it, plastic is climate change, just in its solid state.

Scientists are still learning how deep the layers of damage may go—how climate-altering gases waft from sun-drenched plastics , how plankton take up microplastics, which may well be altering their capacity to supply oxygen and sequester industrial carbon, pulling it down and away and into the sea. “Research into these [climate] impacts is still in its infancy,” according to a report published by CIEL and several other groups , “but early indications that plastic pollution may interfere with the largest natural carbon sink on the planet should be cause for immediate attention and serious concern.”

And so I think back to that funeral, recall the cup in hand, the waves of grief. As wildfires spark , as their smoke wafts across continents, as waters rise and shorelines recede, amid droughts and deluge, cancers and extinctions, deadly heat and deadly pandemics, it might not seem like the right time to talk about plastics—about the excess of war-matured, throwaway plastics foisted onto society that can now be found everywhere, anywhere. But it is. And the world doesn’t have a moment to waste.

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Children Play among Plastic

While plastic pollution is a worldwide problem it is most obvious in less-wealthy African and Asian nations, like the Philippines. Here, children play among plastic waste on the shore of Manila Bay.

Photograph by Randy Olson

Plastic pollution has become one of the most pressing environmental issues, as rapidly increasing production of disposable plastic products overwhelms the world’s ability to deal with them. Plastic pollution is most visible in less-wealthy Asian and African nations, where garbage collection systems are often inefficient or nonexistent. But wealthy nations, especially those with low recycling rates, also have trouble properly collecting discarded plastics. Plastic trash has become so ubiquitous it has prompted efforts to write a global treaty negotiated by the United Nations. How Did this Happen? Plastics made from fossil fuels are just over a century old. Production and development of thousands of new plastic products accelerated after World War II to the extent that life without plastics would be unimaginable today. Plastics revolutionized medicine with life-saving devices, made space travel possible, lightened cars and jets—saving fuel and lessening pollution —and saved lives with helmets, incubators , and equipment for clean drinking water. The conveniences plastics offer, however, led to a throw-away culture that reveals the material’s dark side: Today, single-use plastics account for 40 percent of the plastic produced every year. Many of these products, such as plastic bags and food wrappers, are used for mere minutes to hours, yet they may persist in the environment for hundreds of years. Plastics by the Numbers Some key facts:

• Half of all plastics ever manufactured have been made in the last 15 years.
• Production increased exponentially, from 2.3 million tons in 1950 to 448 million tons by 2015. Production is expected to double by 2050.
• Every year, about 8 million tons of plastic waste escapes into the oceans from coastal nations. That’s the equivalent of setting five garbage bags full of trash on every foot of coastline around the world.
• Plastics often contain additives making them stronger, more flexible, and durable. But many of these additives can extend the life of products if they become litter, with some estimates ranging to at least 400 years to break down.

How Plastics Move around the World Most of the plastic trash in the oceans, Earth’s last sink, flows from land. Trash is also carried to sea by major rivers, which act as conveyor belts, picking up more and more trash as they move downstream . Once at sea, much of the plastic trash remains in coastal waters. But once caught up in ocean currents, it can be transported around the world. On Henderson Island, an uninhabited atoll in the Pitcairn Group isolated halfway between Chile and New Zealand, scientists found plastic items from Russia, the United States, Europe, South America, Japan, and China. They were carried to the South Pacific by the South Pacific gyre , a circular ocean current. Microplastics Once at sea, sunlight, wind, and wave action break down plastic waste into small particles, often less than half a centimer (one-fifth of an inch) across. These so-called microplastics are spread throughout the water column and have been found in every corner of the globe, from Mount Everest, the highest peak, to the Mariana Trench, the deepest trough . Microplastics are breaking down further into smaller and smaller pieces. Plastic microfibers (or the even smaller nanofibers), meanwhile, have been found in municipal drinking water systems and drifting through the air. Harm to Wildlife Millions of animals are killed by plastics every year, from birds to fish to other marine organisms. Nearly 700 species, including endangered ones, are known to have been affected by plastics. Nearly every species of seabird eats plastics. Most of the deaths to animals are caused by entanglement or starvation. Seals, whales, turtles, and other animals are strangled by  abandoned fishing gear or discarded six-pack rings. Microplastics have been found in more than 100 aquatic species, including fish, shrimp, and mussels destined for our dinner plates. In many cases, these tiny bits pass through the digestive system and are expelled without consequence. But plastics have also been found to have blocked digestive tracts or pierced organs, causing death. Stomachs so packed with plastics reduce the urge to eat, causing starvation. Plastics have been consumed by land-based animals, including elephants, hyenas, zebras, tigers, camels, cattle, and other large mammals, in some cases causing death. Tests have also confirmed liver and cell damage and disruptions to  reproductive systems , prompting some species, such as oysters, to produce fewer eggs. New research shows that larval fish are eating nanofibers in the first days of life, raising new questions about the effects of plastics on fish populations. Stemming the Plastic Tide Once in the ocean, it is difficult—if not impossible—to retrieve plastic waste. Mechanical systems, such as Mr. Trash Wheel, a litter interceptor in Maryland’s Baltimore Harbor, can be effective at picking up large pieces of plastic, such as foam cups and food containers, from inland waters. But once plastics break down into microplastics and drift throughout the water column in the open ocean, they are virtually impossible to recover. The solution is to prevent plastic waste from entering rivers and seas in the first place, many scientists and conservationists—including the National Geographic Society—say. This could be accomplished with improved waste management systems and recycling, better product design that takes into account the short life of disposable packaging, and reduction in manufacturing of unnecessary single-use plastics.

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• Pollution Essay in English for Students

Essay on Pollution for Students

Being aware of pollution is quite mandatory for all the students these days. In order to become a responsible citizen of the world for future generations, every child should know how human activities are leaving an impact on the environment and nature. This topic is quite crucial. And, school children should learn how to write an interesting essay on ‘Pollution’ effortlessly. Take a glance below. 

A Few Things to Keep in Mind:

Never ever hurry to write the essay.

Think properly and jot down your thoughts before proceeding.

Divide your write-up into a few segments such as - introduction, main body - you can make a few points as per the topic and a conclusion.

Try writing short paragraphs. Short and crisp sentences are also a great way to avoid silly mistakes.

Adding factual data wherever required is important such as year, date etc.

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Essay on Pollution

Introduction.

Pollution has become a very common yet serious issue in today’s world. It has been there in different forms since a long time even before human evolution such as volcanic eruptions, wildfire which lead to various photochemical reactions in the atmosphere. The current concern is that it is rising day by day due to various resources of pollutants. And, one of the main pollutants are humans and man-made machines. It is right to say that pollution is damaging the mother earth severely and we, humans, should play our part to prevent it from happening.

What is Pollution?

Pollution sepsis is the presence of contaminants in the natural environment that causes harm and damage and therefore leads to adverse changes.

Kinds of Pollution

There are mainly three kinds of pollution - 1) Air Pollution, 2) Water Pollution, and 3) Soil Pollution. 

Air Pollution

Air Pollution occurs due to the presence of harmful gases and substances in the air. It is due to vehicle emission, dust and dirt, poisonous gasses from the factories etc. To reduce air pollution, we should use carpooling or public transport rather than using our private mode of transportation whose harmful gas emission only adds to the problem, we should also actively avoid burning trash or other materials etc.

Water Pollution

Water Pollution happens when toxic substances get mixed in various water bodies such as lakes, oceans, rivers etc. Here toxic substances refer to the Chemical fertilizer, Industrial waste, Sewage and wastewater, Mining activities, Marine dumping etc.

Soil Pollution

Soil pollution depicts the contamination of soil due to the presence of toxic substances due to Excessive use of fertilisers and pesticides, deforestation, industrial waste etc . To maintain the soil’s fertility, the government must limit the usage of fertilizers and plant more trees.

There are a few other pollutants causing pollution apart from the aforementioned ones, such as Radioactive pollution. This is one of the rarer types of pollution. It occurs due to the presence of radioactive substances such as the presence of nuclear waste in air, solids, liquids or any other place.

Effects of Pollution on Human Health

Pollution is increasingly having a major effect on the health of human lives. People are gettin g affected by different types of deadly diseases due to the various pollution in air, water and soil. Here are the different diseases humans face due to different pollution.

Due to Air Pollution

Air is an essential part of human life. Humans cannot live without breathing air. But, air pollution causes major damage to human lives. Here are some of the major diseases caused due to air pollution.

Lung cancer

Major coronary heart disease

Respiratory problems

Due to Water Pollution

Water is another source of life. Any living being cannot survive without drinking water. But the continuous degradation and pollution of major water bodies are also causing deadly diseases to humans and animals. It is also affecting marine life. Since water is consumed all the time, it’s pollution is causing a lot of deadly diseases. Some of the major diseases caused by water pollution are as follows:

Hepatitis A

Diarrhoea 

Due to Soil Pollution

Soil is an important part of our lives. The land on which we are walking or travelling is made with soil. Due to all the chemicals mixed with the soil and degradation due to the same, it is inevitable that many harmful chemicals come in contact with our body and cause many skin diseases or in forms of food crops that are planted on such polluted soil. Direct contact can cause a lot of problems for us humans. Some of the major diseases caused due to soil pollution are as follows:

Different types of cancer

Damage of the nervous system due to contact with lead present in the soil.

liver and kidney failure

What are the Different Methods to Reduce Pollution?

The degrading quality of all the important elements like air, water and soil is affecting the lives of many children, adults as well as animals. We need to keep our environment safe and use effective methods to reduce pollution. 

Methods to reduce Air Pollution

Some of the effective methods to reduce air pollution are as follows:

Regulation of air through chimneys: The industries should disintegrate the harmful gas from the air prior to its release from the chimneys. They should check and avoid using harmful gases, which are the major causes of air pollution.

Use of public transport or cycle: If you are travelling to distant places, it is recommended to take public transport. Or if you are going to any shops or buying any garment, it is always better to use your cycle. Public transport can take you to different places along with other people; this will help reduce air pollution. If you can cycle, it will reduce air pollution and another added benefit is that it will keep your health in check.

Reduction of fires and smokes: In the dry season, many people burn plastic, papers, dry leaves, which creates a big fire and smoke that creates a harmful layer of fog suspended in the atmosphere. It is better if you stop burning plastic to reduce smoke.

Methods to Reduce Water Pollution

Some of the effective methods to reduce water pollution are as follows:

Avoid disposing of plastic and waste materials: To keep the water free from any pollution, the first thing is to avoid disposing of any sort of plastics or food waste water material in water. The waste materials get dissolved in the water and harm the aquatic life along with those who drink the water. 

Reduce use of chemicals: you should avoid purchasing harmful chemical products that can get mixed with the water and pollute it. The biggest examples are pesticides and insecticides, which causes a major effect on marine life.

Reduce use of detergents: Detergents have many strong chemicals which can cause the leather to water and wash your clothes. If these detergents get mixed with water, they can pollute the soil.

Methods to Reduce Soil Pollution 

Some of the methods to reduce soil pollution are as follows:

Avoid disposing of harmful chemicals: The industries should avoid disposing of harmful chemicals in the soil. It can change the structure and components of the soil making it an unusable surface of land for vegetation. 

Eat food in biodegradable containers: As you dispose of the food containers in dustbins, it is good to use biodegradable food containers despite using plastic containers, which are harmful to the soil.

Plant more trees: The structure of the soil can be improved by planting more trees. Trees help to hold the soil together and improve the soil quality. Hence we should plant more trees.

How to Reduce Pollution Gradually?

Upon learning about the harmful effects of pollution, it is everyone’s responsibility to take some steps towards prevention. We should be aware of all the possible preventive measures to help reduce every kind of pollution such as to curb air pollution, we should avoid bursting crackers during any festival or using public transport or carpool to reduce air pollution or cutting down the usage of loud loudspeaker, and public honking would help in noise pollution. We should always be aware of this situation and take measures accordingly. It’s us who should be cautious in the beginning and make everyone else surrounding us conscious as well. We should take eco-friendly steps like planting more trees, reducing the usage of plastic, using more sustainable products in the household etc. while talking about the pollution of the entire world, you should always remember that every small step will lead to a bigger impact one day.

In a nutshell, every kind of pollution leaves a huge negative impact on our environment, human lives, animals etc. We, as responsible citizens, must take steps towards a better tomorrow. We must join hands to take various initiatives and fight against this problem. A lot of innocent lives are put in danger due to pollution every day. If we don’t do anything from now on or take a stand to make the earth pollution-free, then the doomsday will be upon us very soon.

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Plastic factories like this one in China are increasing production of virgin plastic, even as plastic pollution sweeps into the oceans in record volumes.

Plastic pollution is a huge problem—and it’s not too late to fix it

Correcting our plastic waste problem requires a fundamental change in thinking about how plastics are made, used, and discarded, two new studies say.

The global campaign to gain control of plastic waste is one of the fastest-growing environmental causes ever mounted. Yet it hasn’t been enough to make a dent in the growing tonnage of discarded plastic that ends up in the seas.

In the next 10 years, the waste that slides into waterways, and ultimately the oceans , will reach 22 million tons and possibly as much as 58 million tons a year. And that’s the “good” news—because that estimate takes into account thousands of ambitious commitments by government and industry to reduce plastic pollution.

Without those pledges, a business-as-usual scenario would be almost twice as bad. With no improvements to managing waste beyond what’s already in place today, 99 million tons of uncontrolled plastic waste would end up in the environment by 2030.

These two scenarios, the result of new research by an international team of scientists, are a far cry from the first global tally published in 2015, which estimated that an average of 8.8 million tons flow into the oceans annually. That was a figure so startling to the world when it was published five years ago, it helped invigorate the plastic trash movement.

Jenna Jambeck, the University of Georgia engineering professor who calculated that number, also came up with a vivid analogy to put it in context. It would be the equivalent of one dump truck tipping a load of plastic into the ocean every minute every day for a year. Jambeck is also part of the team that came up with the new calculations. But coming up with a new way to visualize 22 to 58 million tons proved a challenge.

“I don’t know. We’re getting into the realm of what’s incomprehensible,” she says. “How about a football stadium filled with plastic every day? Or enough plastic to cover Rhode Island or the country of Luxembourg ankle deep?”

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Neither of these new analogies, while accurate, capture the magnitude of what’s at stake. (More: We're drowning in plastic—find out why. )

Like climate change, a lot rides on how the global community responds in the next couple of decades. And, though the parallels between the problem of plastic waste and climate change are obvious—both are rooted in oil, the basic ingredient to make plastics, they are dissimilar in one key way: plastic’s persistence. While there is some possibility, however remote, that technology and restoration of natural ecosystems could remove CO 2 from the atmosphere, there is no such analog for plastic. Virtually indestructible, it doesn’t disappear.

“For me, the biggest issue is the question of permanence,” says George Leonard , the Ocean Conservancy’s chief scientist and a member of the team that produced this newest forecast. “If we don’t get the plastic pollution problem in the ocean under control, we threaten contaminating the entire marine food web, from phytoplankton to whales. And by the time the science catches up to this, perhaps definitively concluding that this is problematic, it will be too late. We will not be able to go back. That massive amount of plastic will be embedded in the ocean’s wildlife essentially forever.”

The power of two

Royal Dutch Shell will produce plastic pellets like these at its new plant in Beaver County, Pennsylvania. The plant will create more than a million tons of the tiny pellets. Many in the Pittsburgh area see it as an economic engine, but others worry about the long-term environmental harm.

The analysis is the second in recent weeks to look ahead to the future of the plastic economy and conclude that correcting the waste problem—40 percent of plastic manufactured today is disposable packaging—requires a fundamental change in thinking about how plastics are made, used, and discarded.

The new findings were made by a team of scientists funded by the National Science Foundation through the University of Maryland’s National Socio-Environmental Synthesis Center ( SESYNC ). The other project, which looks ahead to 2040, was led by the Pew Charitable Trusts and SYSTEMIQ, a London-based environmental advisory and investment firm, and was first made public in July. Both studies were published together in the journal Science in September.

What’s unusual is that two independent scientific working groups, using differing methodologies and timelines, reached the same broad conclusions. Both laid blame for the rising tonnage of plastic in the seas on the growth of plastic production that is outpacing the world’s ability to keep up with collecting plastic trash. They also agreed that reducing surging waste requires reducing surging production of virgin plastic.

“The magnitude of the problem is the same. The difference is in methodology,” says Stephanie Borrelle, a marine biologist in New Zealand and lead author of the SESYNC study. “We have to do something about this and do it soon. Our annual count of leakage doesn’t account for what’s already in the oceans.”

Both projects also concluded that plastic waste could be significantly reduced, though not eliminated, using existing technologies. That includes improving waste collection and recycling, redesigning products to eliminate packaging made from unrecyclable plastics, expanding refillables, and in some cases substituting other materials. But solutions such as recycling, now globally hovering around 12 percent, would also require a massive scaling-up with many additional recycling facilities that don’t exist.

The SESYNC project also calls for cleaning up plastic waste from shorelines, where possible. To give an idea of the scale involved in achieving that goal, it would require a billion people to participate in the Ocean Conservancy’s annual beach cleanup that now attracts about one million volunteers.

“The inconvenient truth now is that this business-as-usual growth in production of new plastics is not compatible with ending plastics in nature,” says Ben Dixon, a former sustainability manager at Royal Dutch Shell and partner at SYSTEMIQ. “That’s the inconvenient truth both studies get to the heart of. We may see more pressures from investors, customers, and a changing of the world underneath the feet of these companies.”

Both projects captured the attention of the plastics industry, which was quick to praise the research, but dismissed the idea of reducing production of virgin plastic as “highly counterproductive and impractical,” in the words of the American Chemistry Council, a trade group for the petrochemical industry. In emailed responses, ExxonMobil and Dow Chemical, two of the world’s leading manufacturers of polyethylene, agreed.

“Reducing production to solve the waste problem will, in turn, aggravate the carbon and climate problem as alternative materials have higher emissions,” Dow said.

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The world’s nations agree to fix the plastic waste crisis

The manufacturing of plastic emits less CO2 and uses less water than for glass or aluminum. Some argue that such accounting doesn’t always factor in all the costs, such as environmental cleanup and weight. Glass manufacturing emits less CO2 per gram, but glass bottles are heavier. And, in the marine world, they say, it’s beside the point: Turtles eat plastic bags, not glass bottles and aluminum cans.

Todd Spitler, an Exxon spokesman, said the company’s focus will be on “increasing plastic recyclability, supporting improvements in plastic waste recovery and minimizing plastic pellet loss from our operations."

The SESYNC study calls for setting global limits on the production of virgin plastic, a recommendation unlikely to be realized. At the last United Nations Environmental Program meeting in Nairobi, Kenya, in 2019, negotiations to pass a resolution calling for phasing out single-use plastic by 2025 and to draft a legally binding treaty on plastic debris ended in a stalemate.

The Pew/SYSTEMIQ study calls for reducing virgin production by 11 percent, arguing there is enough waste plastic that could be recycled and remade into new plastic to satisfy demand. The problem is that virgin plastic—new resin created from natural gas or oil—is so cheap to make that it undermines the economics of the recycling market. It is simply less expensive to manufacture new plastic than to collect, sort, and process disposable plastic into new feedstock. Especially now, with the collapse of oil prices. (Read more on the SYSTEMIQ study here.)

Plastic production to increase by 2050

In fact, production is forecast to more than double by 2050—increasing to 756 million tons anticipated in 2050 from 308 million tons produced in 2018, according to a report published by the American Chemistry Council in 2019. In the United States, $203 billion has been invested in 343 new or expanded chemical plants to produce plastics, according to ACC figures published last February. Production capacity for ethylene and propylene is projected to increase by 33 to 36 percent, according to an estimate by the Center for International Environmental Law.

Keith Christman , the ACC’s managing director of plastics markets, says the demand for plastic products, such as lightweight automobile parts and materials used in home construction, including insulation and water piping, is only going to grow.

“New technologies is the direction that we see the industry going,” he says.

Historically, plastic production has increased almost continuously since the 1950s, from 1.8 million tons in 1950 to 465 million tons in 2018. As of 2017, 7 billion of the 8.8 billion tons produced globally over that whole period have become waste.

The industry attributes future growth to two factors: the increasing global population and demands for more plastic consumer goods, fueled by the increasing buying power of a growing middle class. The UN projects that the world’s population, now about 7.8 billion, will add about two billion more by 2050, primarily in Asia and Africa. Globally, the middle class is anticipated to expand by 400 million households by 2039—and that is where the plastics market growth will occur.

Africa, to cite one example, shows the complications that lie ahead for gaining control of plastic waste in the coming decades. The continent today generates waste at a low rate by global standards, according to a UN report published last year. It also has limited environmental regulations, weak enforcement, and inadequate systems in place to manage waste. But as its population explodes and becomes more urban, and as buying habits change with higher standards of living, sub-Saharan Africa is forecast to become the dominant region producing municipal waste.

“Everyone is going to need to play a role along the whole value chain,” says Guy Bailey , a leading plastics analyst at Wood Mackenzie, a consulting firm specializing in energy, chemicals, mining and other research.

“If you are a recycler, it is difficult to make an investment when oil prices completely destroy the economics of your business. If you are a packing company, you are faced with so many choices of materials, it’s hard to know which to pick. If you are a chemical company, you clearly can see the reputational challenge. They risk losing their social license to operate if things go too far. They want to address those challenges.”

The Alliance to End Plastic Waste, founded last year by 50 industry titans, committed to investing $1.5 billion in creating solutions to improve methods for collecting plastic waste and recycling into new products. So far, it has launched 14 projects, many in Southeast Asia and Africa, including in the Philippines, Indonesia, and Ghana.

Jacob Duer, president and CEO, said the new report “reiterates the necessity and the urgency in addressing the issue and underlines the importance of a paradigm shift.”

As the organization, based in Singapore, matures, he says the number of projects and capital investment will grow. But it opposes reducing virgin plastic production.

Both Duer and Martyn Ticknet, head of the Alliance’s project development, see similarities between tackling plastic waste and global efforts to close the hole in the ozone layer that began in the 1970s. Last year the hole had shrunk to its smallest size on record since its discovery.

“We’ve solved major crises before,” Ticknet says. “It takes some time to get going.”

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Project 2025: A wish list for a Trump presidency, explained

It is billed as a policy "wish list" for the next Republican president that would vastly expand presidential powers and impose an ultra-conservative social vision on the US.

Donald Trump has disavowed the Heritage Foundation's Project 2025 document, though many of its authors worked for his previous administration.

Links between the Trump campaign and Project 2025 have been highlighted by the former president's critics, and this attack line will likely continue at the Democratic National Convention in Chicago this month.

Here's your guide to what the document contains.

Who wrote Project 2025?

It is common for Washington think tanks of all political stripes to propose policy wish lists for potential governments-in-waiting.

The conservative Heritage Foundation first produced policy plans for future Republican administrations in 1981, when Ronald Reagan was about to take office.

It has produced similar documents in connection with subsequent presidential elections, including in 2016, when Trump won the presidency.

A year into his term, the think tank boasted that the Trump White House had adopted nearly two-thirds of its proposals.

The Project 2025 report was unveiled in April 2023, but liberal opposition to the document has ramped up now that Trump has extended his polling lead.

The Republican nominee himself has distanced himself from the proposal.

"I know nothing about Project 2025," he posted on his social media website, Truth Social. "I have no idea who is behind it.

"I disagree with some of the things they're saying and some of the things they’re saying are absolutely ridiculous and abysmal."

But the team that created the project is chock-full of former Trump advisers, including director Paul Dans, who was chief of staff at the Office of Personnel Management while Trump was president.

Mr Dans left the project in late July, clearing the way for Heritage Foundation President Kevin Roberts to take over. He said he was leaving during the presidential election season in order to "direct all my efforts to winning, bigly".

Russell Vought, another former Trump administration official, wrote a key chapter in the document and also serves as the Republican National Committee’s 2024 platform policy director.

More than 100 conservative organisations contributed to the document, Heritage says, including many that would be hugely influential in Washington if Republicans took back the White House.

The Project 2025 document sets out four main policy aims: restore the family as the centrepiece of American life; dismantle the administrative state; defend the nation's sovereignty and borders; and secure God-given individual rights to live freely.

Here's an outline of several of its key proposals.

Project 2025 proposes that the entire federal bureaucracy, including independent agencies such as the Department of Justice, be placed under direct presidential control - a controversial idea known as "unitary executive theory".

In practice, that would streamline decision-making, allowing the president to directly implement policies in a number of areas.

The proposals also call for eliminating job protections for thousands of government employees, who could then be replaced by political appointees.

The document labels the FBI a "bloated, arrogant, increasingly lawless organization". It calls for drastic overhauls of this and several other federal agencies, as well as the complete elimination of the Department of Education.

What does the Republican party platform say?

The party platform includes a proposal to "declassify government records, root out wrongdoers, and fire corrupt employees", pledges to slash regulation and government spending. But it stops short of proposing a sweeping overhaul of federal agencies as outlined in Project 2025.

Immigration

Increased funding for a wall on the US-Mexico border - one of Trump's signature proposals in 2016 - is proposed in the document.

Project 2025 also proposes dismantling the Department of Homeland Security and combining it with other immigration enforcement units in other agencies, creating a much larger and more powerful border policing operation.

Other proposals include eliminating visa categories for crime and human trafficking victims, increasing fees on immigrants and allowing fast-tracked applications for migrants who pay a premium.

Not all of those details are repeated in the party platform, but the overall headlines are similar - the party is promising to implement the "largest deportation programme in American history".

What a Trump second term would look like

Climate and economy.

The document proposes slashing federal money for research and investment in renewable energy, and calls for the next president to "stop the war on oil and natural gas".

Carbon-reduction goals would be replaced by efforts to increase energy production and energy security.

The paper sets out two competing visions on tariffs, and is divided on whether the next president should try to boost free trade or raise barriers to imports.

But the economic advisers suggest that a second Trump administration should slash corporate and income taxes, abolish the Federal Reserve and even consider a return to gold-backed currency.

The party platform does not go as far as Project 2025 in these policy areas. The platform instead talks of bringing down inflation and drilling for oil to reduce energy costs, but is thin on specific policy proposals.

Abortion and family

Project 2025 does not call outright for a nationwide abortion ban.

However, it proposes withdrawing the abortion pill mifepristone from the market, and using existing but little-enforced laws to stop the drug being sent through the post.

The document suggests that the department of Health and Human Services should "maintain a biblically based, social science-reinforced definition of marriage and family".

On this issue at least, the document differs fairly substantially from the Republican platform, which only mentions the word "abortion" once. The platform says abortion laws should be left to individual states and that late-term abortions (which it does not define) should be banned.

It adds that that access to prenatal care, birth control and in-vitro fertilisation should be protected. The party platform makes no mention of cracking down on the distribution of mifepristone.

Tech and education

Under the proposals, pornography would be banned, and tech and telecoms companies that allow access would be shut down.

The document calls for school choice and parental control over schools, and takes aim at what it calls "woke propaganda".

It proposes to eliminate a long list of terms from all laws and federal regulations, including "sexual orientation", "gender equality", "abortion" and "reproductive rights".

Project 2025 aims to end diversity, equity and inclusion programs in schools and government departments as part of what it describes as a wider crackdown on "woke" ideology.

Project 2025's proposals in this policy area are broadly reflected in the Republican platform, which in addition to calling for the abolishing the Department of Education, aims to boost school choice and parental control over education and criticises what the party calls the "inappropriate political indoctrination of our children".

Social Security

Although Heritage has long supported reforming the country's public pension plan, Project 2025 barely touches this third rail of American politics.

The platform says Social Security is a "lifeline" for millions of retired Americans and Republicans will "restore Economic Stability to ensure the long-term sustainability" of the programme.

The plan's future

Project 2025 is backed by a $22m (£17m) budget and includes strategies for implementing policies immediately after the presidential inauguration in January 2025.

Heritage is also creating a database of conservative loyalists to fill government positions, and a programme to train those new workers.

Democrats led by Jared Huffman, a congressman from California, have launched a Stop Project 2025 Task Force.

And many of the proposals would likely face immediate legal challenges from Trump's opponents if implemented.

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Where biden and trump stand on key issues, four things that could decide who wins us election.

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W.H.O. Declares Global Emergency Over New Mpox Outbreak

The epidemic is concentrated in the Democratic Republic of Congo, but the virus has now appeared in a dozen other African countries.

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By Apoorva Mandavilli

The rapid spread of mpox, formerly called monkeypox, in African countries constitutes a global health emergency, the World Health Organization declared on Wednesday.

This is the second time in three years that the W.H.O. has designated an mpox epidemic as a global emergency. It previously did so in July 2022. That outbreak went on to affect nearly 100,000 people , primarily gay and bisexual men, in 116 countries, and killed about 200 people.

The threat this time is deadlier. Since the beginning of this year, the Democratic Republic of Congo alone has reported 15,600 mpox cases and 537 deaths. Those most at risk include women and children under 15.

“The detection and rapid spread of a new clade of mpox in eastern D.R.C., its detection in neighboring countries that had not previously reported mpox, and the potential for further spread within Africa and beyond is very worrying,” said Dr. Tedros Adhanom Ghebreyesus, the W.H.O.’s director general.

The outbreak has spread through 13 countries in Africa, including a few that had never reported mpox cases before. On Tuesday, the Africa Centers for Disease Control and Prevention declared a “public health emergency of continental security,” the first time the organization has taken that step since the African Union granted it the power to do so last year.

“It’s in the interests of the countries, of the continent and of the world to get our arms around this and stop transmission as soon as we can,” said Dr. Nicole Lurie, the executive director for preparedness and response at the Coalition for Epidemic Preparedness Innovations, a nonprofit that finances vaccine development.

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