Brian Barton
Air pollution is a major threat to global health and prosperity, causing more than 6.5 million deaths annually. It is caused by a combination of human-made and natural sources, including vehicle emissions, fuel oils, natural gas, manufacturing by-products, coal-fueled power plants, and fumes from chemical production. These pollutants, such as ozone, carbon monoxide, nitrogen dioxide, and particulate matter, have severe health consequences, including respiratory and cardiovascular diseases, cancer, and adverse effects on pregnancy and childhood development. Addressing air pollution through regulations and clean energy transitions is crucial for protecting public health and reducing premature mortality.
| Characteristics | Values |
|---|---|
| Number of deaths caused by air pollution each year | 6.5 million (globally) |
| Percentage of people breathing air that exceeds the WHO's guideline limits | 99% |
| Number of people living in counties that received an F for ozone or particle pollution in "State of Air" 2025 | 156 million (in the US) |
| Number of people living in counties that received an F for all three air pollution measures in "State of Air" 2025 | 42 million (in the US) |
| Number of people who die prematurely from household air pollution | 3.2 million |
| Number of people who die from ambient air pollution each year | 4.2 million |
| Percentage of the urban population exposed to concentrations of fine particulate matter above the health-based guideline level set by the WHO in 2021 | 97% |
| Year the National Ambient Air Quality Standards were established | 1970 |
| Year the WHO published new air quality guidelines | 2021 |
| Year the European Commission published a proposal for a revision of the Ambient Air Quality Directive | 2022 |
| Year the Clean Air Act was established | 1970 |
| Percentage of the country's total greenhouse gas emissions that carbon dioxide accounted for in 2021 | 79% |
| Percentage of the country's total greenhouse gas emissions that methane accounted for in 2021 | 11% |
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What You'll Learn
- Air pollution is a major threat to global health, causing millions of deaths annually
- Particulate matter (PM) is a deadly pollutant that can cause serious health issues
- Ozone, or ground-level smog, is a dangerous and widespread pollutant
- Air pollution is linked to respiratory issues, including asthma and lung disease
- Long-term exposure to air pollution is associated with cancer, cardiovascular disease, and diabetes
Air pollution is a major threat to global health, causing millions of deaths annually
Air pollution is a significant and growing threat to global health, causing millions of deaths annually. According to the World Health Organization (WHO), air pollution is responsible for approximately seven million deaths worldwide each year. This figure may be conservative, as it only includes health outcomes with strong epidemiological evidence, such as stroke, heart disease, pulmonary disease, pneumonia, and lung cancer. The true number of deaths attributable to air pollution is likely higher.
The primary sources of human-made air pollution are vehicle emissions, fuel oils, natural gas used for heating, manufacturing by-products, and power generation, particularly from coal-fueled plants. Natural sources of air pollution include smoke from wildfires, ash and gases from volcanic eruptions, and gases like methane emitted from decomposing organic matter. These sources release a mix of hazardous substances into the air, including ozone, carbon dioxide, carbon monoxide, nitrogen oxides, sulfur oxides, and particulate matter.
Particulate matter, or PM, is composed of tiny particles of chemicals, soil, smoke, dust, or allergens. Fine particulate matter, known as PM2.5, is of particular concern as it can be inhaled deeply into the lungs, penetrating tissue and entering the bloodstream. PM2.5 has been linked to serious health problems, including respiratory and cardiovascular diseases, lung cancer, and adverse perinatal outcomes. In 2021, 97% of the global urban population was exposed to PM2.5 concentrations above the health-based guideline level set by the WHO.
Short-term exposure to higher levels of outdoor air pollution has been associated with reduced lung function, asthma, cardiac problems, and increased emergency department visits and hospital admissions. Long-term exposure to air pollution has been linked to an increased risk of chronic diseases, cancer, diabetes, obesity, neurological disorders, and immune system dysfunction. Certain groups are more vulnerable to the health impacts of air pollution, including children, whose developing bodies and immune systems are more susceptible to harm.
The health effects of air pollution are not limited to physical health. The European Environment Agency's zero pollution action plan recognizes the impact of air pollution on ecosystems and biodiversity. Climate pollutants, such as greenhouse gases, contribute to climate change, leading to rising sea levels, extreme weather events, heat-related deaths, and the increased transmission of infectious diseases.
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Particulate matter (PM) is a deadly pollutant that can cause serious health issues
Particulate matter (PM) is a complex mixture of solid and aerosol particles, composed of chemicals such as sulfates, nitrates, carbon, or mineral dust. These particles are released into the atmosphere through vehicle and industrial emissions, the burning of fossil fuels, cigarette smoke, wildfires, and other sources. PM is a deadly form of air pollution, and exposure to it can lead to a range of serious health issues.
PM is classified into two main categories: PM10 and PM2.5, with diameters of 10 micrometers or less, and 2.5 micrometers or less, respectively. These particles are so small that they can be inhaled, penetrating deep into the lungs and even entering the bloodstream. This can result in serious health problems, especially for those with pre-existing heart or lung conditions.
The health effects of PM exposure are wide-ranging and can be both short-term and long-term. Short-term exposure to PM has been linked to increased respiratory symptoms, such as irritation of the airways, coughing, and difficulty breathing. It has also been associated with a worsening of respiratory diseases, including asthma and chronic obstructive pulmonary disease (COPD), often leading to hospitalisations and emergency department visits.
Long-term exposure to PM, especially PM2.5, has been linked to even more severe health outcomes. Numerous studies have found a strong association between PM exposure and premature death, particularly in individuals with heart or lung diseases. Additionally, PM exposure has been linked to reduced lung function, lung cancer, and adverse effects on cardiovascular health, including heart attacks and strokes.
The impact of PM exposure is not limited to respiratory and cardiovascular health. Research has also suggested links between air pollution and neurological development, diabetes, and reproductive, immune, and neurological disorders. Certain groups are more vulnerable to the health effects of PM, including children, older adults, and individuals with pre-existing health conditions.
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Ozone, or ground-level smog, is a dangerous and widespread pollutant
Ozone, or ground-level smog, is a dangerous and widespread air pollutant. It is a major threat to human health and ecosystems. Ground-level ozone is not emitted directly into the air but is formed by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOCs) in the presence of sunlight. Cars, power plants, industrial boilers, refineries, chemical plants, and other sources emit these pollutants.
Ozone is a gas composed of three oxygen atoms, whereas the oxygen we need for life is made up of molecules with two oxygen atoms. Ozone in the upper atmosphere, or stratosphere, is beneficial as it forms a protective layer that shields us from the sun's harmful ultraviolet rays. However, ground-level ozone is harmful to human health. It can trigger a variety of health problems, especially for children, the elderly, and people with pre-existing lung diseases such as asthma.
Breathing ground-level ozone can result in respiratory illnesses, metabolic disorders, nervous system issues, and reproductive problems. It can also worsen existing lung conditions and trigger asthma attacks. Long-term exposure to ground-level ozone has been linked to increased respiratory and cardiovascular-related mortality. Studies have shown that the risk of premature death increases with higher levels of ozone exposure.
Ground-level ozone is particularly prevalent in urban areas and during hot summer days. It can be transported by wind, affecting even rural regions. Strategies to reduce ground-level ozone focus on decreasing methane emissions and cutting atmospheric pollution from vehicles, power plants, and other sources.
Overall, ground-level ozone, or smog, poses a significant danger to human health and the environment, requiring concerted efforts to mitigate its harmful impacts.
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Air pollution is linked to respiratory issues, including asthma and lung disease
Air pollution is a mix of hazardous substances from both human-made and natural sources. It is a major threat to global health and prosperity, causing more than 6.5 million deaths each year. The primary sources of human-made air pollution include vehicle emissions, fuel oils, natural gas used for heating, and by-products of manufacturing and power generation. Natural sources of air pollution include smoke from wildfires, ash and gases from volcanic eruptions, and gases like methane, which is released from decomposing organic matter in soils.
Air pollution is particularly harmful to people with asthma and lung disease. Small particles and gases in polluted air can pass through the nose or mouth and enter the lungs and bloodstream. These particles can irritate the airways and lungs, causing inflammation and a range of respiratory symptoms, including coughing, wheezing, chest tightness, and dyspnea. People with asthma may experience more symptoms and need to use their reliever inhalers more frequently during periods of high air pollution.
Long-term exposure to air pollution can also increase the risk of developing asthma and chronic obstructive pulmonary disease (COPD). Children are especially vulnerable, as their lungs are still developing, and they breathe faster, taking in more polluted air. Exposure to air pollution during childhood increases the risk of developing asthma and COPD in adulthood. Additionally, pregnant individuals exposed to high levels of air pollution may have babies who are more likely to develop asthma.
Air pollution also contributes to the development of lung cancer. Particulate matter, nitrogen dioxide, ozone, and sulfur dioxide are particularly harmful types of air pollution in this regard. These pollutants can damage the lungs, causing inflammation and increasing the risk of lung infections such as pneumonia and bronchitis. Overall, air pollution poses a significant risk to respiratory health, especially for individuals with pre-existing conditions such as asthma and lung disease.
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Long-term exposure to air pollution is associated with cancer, cardiovascular disease, and diabetes
Air pollution is a mix of hazardous substances from both human-made and natural sources. It is a major threat to global health and prosperity, causing more than 6.5 million deaths each year. The main pathway of exposure from air pollution is through the respiratory tract, causing inflammation, oxidative stress, immunosuppression, and mutagenicity in cells throughout the body, impacting the lungs, heart, brain, and other organs.
Long-term exposure to air pollution is associated with an increased risk of cancer, cardiovascular disease, and diabetes. Fine particulate matter (PM 2.5) is of particular concern, as it can be inhaled deeply into the lung tissue and contribute to serious health problems. PM 2.5 accounts for most health effects due to air pollution in the United States. Studies have found that long-term exposure to PM 2.5 is associated with a higher risk of cardiovascular events in women. Each increase of 10 micrograms per cubic meter was associated with a 24% increase in the risk of a cardiovascular event and a 76% increase in the risk of death from cardiovascular disease.
In addition to cardiovascular risks, long-term exposure to PM 2.5 has been linked to an increased risk of lung cancer. A study found that women living near major roadways had an increased risk of breast cancer. Another long-term study found an association between lung cancer incidence and increased reliance on coal for energy generation. Fine particulate matter can also impair blood vessel function and speed up calcification in arteries, which may contribute to cardiovascular disease.
The health effects of air pollution are not limited to cancer and cardiovascular disease. A growing body of evidence suggests that air pollution may also affect diabetes and neurological development in children. Maternal exposure to air pollution is associated with adverse birth outcomes, such as low birth weight, pre-term birth, and small for gestational age births. Thus, long-term exposure to air pollution has wide-ranging impacts on human health, including an increased risk of cancer, cardiovascular disease, diabetes, and adverse pregnancy outcomes.
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Frequently asked questions
Air pollution is the presence of one or more contaminants in the atmosphere, such as dust, fumes, gas, mist, odour, smoke or vapour, in quantities and durations that can be harmful to human health.
Air pollution is responsible for more than 6.5 million deaths each year globally. It is a major threat to global health and prosperity. It is associated with oxidative stress and inflammation in human cells, which may lay the foundation for chronic diseases and cancer. 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. Fine particulate matter (PM 2.5) can be inhaled deeply into lung tissue and contribute to serious health problems.
Vehicle emissions, fuel oils, natural gas used to heat homes, by-products of manufacturing and power generation, and fumes from chemical production are the primary sources of human-made air pollution. Nature also releases hazardous substances into the air, such as smoke from wildfires, ash and gases from volcanic eruptions, and gases like methane, which are emitted from decomposing organic matter in soils.
