Kiera Jefferson
Pollution is a significant health and environmental concern worldwide, with air pollution being a leading risk factor for death and disease. In recent years, air pollution has contributed to approximately one in ten deaths globally, with even higher rates in low- and middle-income countries. Indoor air pollution, often caused by solid fuel use for cooking, and outdoor air pollution, associated with industrialization, pose severe challenges. Lead pollution, primarily in lower- and middle-income countries, resulted in an estimated 5.5 million adult deaths from cardiovascular disease in 2019. Pollution management offers opportunities to enhance economic growth, improve health, and alleviate poverty. Various organizations, including the World Bank, are actively supporting initiatives to reduce pollution, promote clean development, and foster a circular economy for healthier lives.
| Characteristics | Values |
|---|---|
| Definition | Contamination of the indoor or outdoor environment by any chemical, physical or biological agent that modifies the natural characteristics of the atmosphere |
| Common sources | Household combustion devices, motor vehicles, industrial facilities, power plants, and forest fires |
| Pollutants of major public health concern | Particulate matter, carbon monoxide, ozone, nitrogen dioxide, sulfur dioxide, mercury, lead, dioxins, and benzene |
| Global impact | Air pollution is one of the leading risk factors for death and disease burden, causing 7 million premature deaths annually |
| Impact on specific populations | Communities of color and low-income communities are disproportionately affected by air pollution and are more vulnerable due to existing health conditions |
| Regional impact | South Asia, the Middle East, and North Africa had the highest levels of air pollution in 2017, with Nepal, India, and Qatar among the top impacted countries |
| Temporal trends | While emissions of the six principal air pollutants in the US have decreased over time, climate change and extreme weather events are making it harder to maintain air quality improvements |
| Initiatives for improvement | Policies supporting sustainable land use, cleaner energy, efficient housing, and better waste management; WHO's awareness and intervention strategies; EPA's national programs for reducing air emissions |
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What You'll Learn
Air pollution sources
Air pollution is defined as contamination of the indoor or outdoor environment by any chemical, physical, or biological agent that modifies the natural characteristics of the atmosphere. There are four main types of air pollution sources: mobile sources, stationary sources, area sources, and natural sources.
Mobile sources include cars, buses, planes, trucks, and trains. These sources account for more than half of all air pollution in the United States, with automobiles being the primary contributor. Federal regulations have played a crucial role in reducing vehicle emissions by regulating car manufacturing and fuel production. For instance, the removal of lead from gasoline and the reduction of sulfur in diesel fuel have significantly decreased lead and sulfur dioxide pollutants in the air.
Stationary sources refer to specific locations that emit large amounts of pollution, such as power plants, oil refineries, industrial facilities, and factories. These sources are also known as point sources of pollution. Power plants, in particular, contribute to elevated ozone concentrations and smog in nearby areas.
Area sources consist of multiple smaller pollution sources that may not be significant on their own but can collectively have a substantial impact. Examples include agricultural areas, cities, and wood-burning fireplaces. Residential wood burning, primarily for home heating, has been increasing over time and is a significant contributor to fine particle emissions. Other sources within this category include construction and agricultural equipment, boats, and snowmobiles.
Natural sources, such as wind-blown dust, wildfires, and volcanoes, can also contribute to air pollution. While these sources may not always create ongoing pollution problems, they can sometimes be significant. For instance, wildfires can release particulate matter and contribute to worsening levels of air pollution, exposing populations to harmful ozone and particle pollution.
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Air pollution and health
Air pollution is a familiar environmental health hazard. It is the contamination of the indoor or outdoor environment by any chemical, physical, or biological agent that modifies the natural characteristics of the atmosphere. 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, constitutes air pollution.
The main pathway of exposure from air pollution is through the respiratory tract. Breathing in these pollutants leads to inflammation, oxidative stress, immunosuppression, and mutagenicity in cells throughout our bodies, impacting the lungs, heart, and brain, among other organs, and ultimately leading to disease. Fine particulate matter (PM 2.5) is of particular concern as it can be inhaled deeply into lung tissue and contribute to serious health problems. Sources of particle pollution include motor vehicles, factories, power plants, equipment, wood burning, and wildfires.
Air pollution exposure is associated with oxidative stress and inflammation in human cells, which may lay the foundation for chronic diseases and cancer. Research has established an association between fine particulate matter and mortality. In 2013, the International Agency for Research on Cancer of the World Health Organization (WHO) classified air pollution as a human carcinogen. Short-term exposure to higher levels of outdoor air pollution is associated with reduced lung function, asthma, and cardiac problems. Long-term exposure increases the risk of diseases with a longer onset, like stroke, heart disease, chronic obstructive pulmonary disease, and cancer.
Maternal exposure to air pollution is associated with adverse birth outcomes, such as low birth weight, pre-term birth, and small gestational age births. Air pollution may also affect diabetes and neurological development in children. Communities of colour are disproportionately exposed to unhealthy air and are more likely to be living with one or more chronic conditions that make them more vulnerable to air pollution, including asthma, diabetes, and heart disease.
Despite great progress in air quality improvement, approximately 140 million people nationwide lived in counties with pollution levels above the primary NAAQS in 2023. WHO data shows that almost the entire global population (99%) breathes air that exceeds WHO guideline limits, with low- and middle-income countries suffering the highest exposures.
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Air quality improvement
According to the World Health Organization (WHO), 99% of the global population breathes air that exceeds WHO guideline limits and contains high levels of pollutants. Air pollution is the contamination of the indoor or outdoor environment by any chemical, physical, or biological agent that modifies the natural characteristics of the atmosphere. Common sources of air pollution include household combustion devices, motor vehicles, industrial facilities, and forest fires.
Reduce Emissions from Individual Sources
The most effective way to improve indoor air quality is usually to eliminate individual sources of pollution or reduce their emissions. For example, sources containing asbestos can be sealed or enclosed, and gas stoves can be adjusted to decrease emissions. This approach is often more cost-efficient than increasing ventilation, as improving ventilation can increase energy costs.
Improve Ventilation
Ventilation can help control indoor temperatures and remove or dilute indoor airborne pollutants. Natural ventilation, such as opening windows and doors, can improve indoor air quality by reducing indoor pollutants. However, if you live near a source of outdoor air pollution, such as a busy freeway or factory, opening windows and doors may not be advisable as it can bring in polluted outdoor air. In such cases, mechanical means of ventilation, such as a heating, ventilation, and air conditioning (HVAC) system, can be used.
Choose Eco-Friendly Transportation
When traveling short distances, consider walking, biking, or using public transportation. Carpooling also helps reduce traffic congestion and per-person emissions. If driving a vehicle is necessary, opt for an electric, hybrid, or smaller, more fuel-efficient car. Aggressive driving practices, such as speeding and rapid acceleration, can lower gas mileage by up to 40%.
Reduce Use of Fireplaces and Wood Stoves
Fireplaces and wood stoves can contribute to indoor air pollution. It is recommended to reduce or eliminate their use and avoid using gas-powered lawn and garden equipment. Additionally, household and garden chemicals should be used with care to minimize evaporation, especially when poor air quality is forecast.
Test for Radon
Radon is a naturally occurring radioactive gas that can enter buildings through cracks in walls, floors, and other openings. It is odorless, tasteless, and colorless, and exposure to radon is the second leading cause of lung cancer in the United States. Testing your home for radon and other dangerous gases is an important step in improving indoor air quality.
By implementing these strategies, we can work towards improving air quality and reducing the health risks associated with air pollution.
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Air pollution and climate change
Air pollution is defined as the contamination of indoor or outdoor environments by toxic or polluting chemical, physical, or biological agents that modify the natural characteristics of the atmosphere. Common sources of air pollution include household combustion devices, motor vehicles, industrial facilities, and forest fires.
Air pollution has severe impacts on public health and the Earth's climate and ecosystems. It is associated with approximately 7 million premature deaths annually, with outdoor and indoor air pollution causing respiratory and other diseases. According to the WHO, 99% of the global population breathes air that exceeds the recommended guideline limits and contains high levels of pollutants, with low- and middle-income countries suffering the highest exposures.
Climate change and air pollution are closely linked and often share the same causes, such as the burning of fossil fuels, transport, industrial emissions, and agriculture. As the climate warms, extreme weather events, including wildfires and droughts, become more frequent and intense, further degrading air quality. For example, wildfire smoke lowers air quality and harms human health, and droughts can increase particulate matter in the air, causing respiratory issues.
Additionally, hot sunny days associated with a warming climate can increase ground-level ozone, a greenhouse gas that contributes to climate change by trapping heat in the atmosphere. Ground-level ozone can also damage crops, plants, and forests, reducing their growth and increasing their sensitivity to diseases. Climate change may also affect indoor air quality by increasing the levels of indoor pollutants such as mold, dust mites, and bacteria, which can enter buildings through open doors, windows, and ventilation systems.
To address air pollution and climate change, interventions and initiatives that support sustainable land use, cleaner energy and transport, energy-efficient housing, improved waste management, and reduced industrial emissions are necessary. These actions can improve air quality, slow global warming, protect ecosystems, and provide health benefits for populations worldwide.
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Air pollution by region
Air pollution is defined as the contamination of the indoor or outdoor environment by any chemical, physical, or biological agent that modifies the natural characteristics of the atmosphere. It is among the biggest health problems faced by modern industrial society, causing more than 10% of all deaths worldwide (nearly 4.5 million premature deaths in 2019). Air pollution can be caused by both natural and man-made sources. Natural sources include volcanic activity, wildfires, dust or sandstorms, and windblown dust and sand. Man-made sources, which tend to be the leading contributors to air pollution in cities, include various forms of combustion from transportation, industrial activity, technological developments, fuel consumption, and other human activities.
Air pollution is a particular problem in emerging and developing countries, where global environmental standards are often not met. Low- and middle-income countries suffer the highest exposures to air pollution, with nearly half of the U.S. population living with unhealthy levels of air pollution. Communities of color are disproportionately exposed to unhealthy air and are more likely to suffer from chronic conditions that make them more vulnerable to air pollution, such as asthma, diabetes, and heart disease.
In the United States, the Environmental Protection Agency (EPA) has made significant progress in improving air quality. Between 1970 and 2023, total emissions of the six principal air pollutants dropped by 78%, and CO2 emissions have been decreasing since 2007. The permanent phase-out of leaded gasoline and controls on emissions of lead compounds have led to a 98% decrease in airborne lead concentrations between 1980 and 2005. Despite these improvements, approximately 140 million people in the U.S. lived in counties with pollution levels above the primary NAAQS in 2023.
Agricultural air pollution is a significant but often under-recognized source of health and economic burdens worldwide. Household air pollution, such as residential cooking and heating with solid fuels like coal or wood, also contributes to air pollution and is associated with premature deaths annually.
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Frequently asked questions
According to the EPA, emissions of the six principal air pollutants dropped by 78% between 1970 and 2023. However, the "State of the Air" 2025 report found that 46% of Americans (approximately 156.1 million people) live in areas with unhealthy levels of air pollution.
Common sources of air pollution include household combustion devices, motor vehicles, industrial facilities, power plants, and forest fires.
Air pollution is a major risk factor for many leading causes of death, including heart disease, stroke, lower respiratory infections, lung cancer, and chronic obstructive pulmonary disease (COPD). It is also associated with an increased risk of asthma, diabetes, and other chronic conditions.
Air pollution levels vary significantly across different regions and countries. For example, South Asia and the Middle East had the highest levels of PM2.5 in 2017, while low- and middle-income countries generally have higher exposures to air pollution. Within the US, the "State of the Air" 2025 report identified Bakersfield, California, as the worst metropolitan area for short-term particle pollution.
