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Air Pollution


Air pollution is a mixture of natural and man-made substances in the air we breathe such as fine particles produced by the burning of fossil fuels, ground-level ozone, which is a reactive form of oxygen that is a primary component of urban smog, and noxious gases such as sulfur dioxideDictionary of Environmental Health, nitrogen oxides, carbon monoxide, and chemical vapors. The health effects of air pollution have been reported in research studies over the past 30 years. These effects include respiratory diseases such as asthma, cardiovascular diseases, changes in lung function, and death. There is mounting evidence that exposure to air pollution has long-term effects on lung development in children.

Health Studies & Clinical Trials 

What NIEHS is Doing on Air Pollution  

smoke billowing from the smoke stacks

General Information 

For Educators 

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