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 Carbon Monoxide | Hydrocarbons
Nitrogen
Oxides | Particulate
Matter
Air pollution
in the United States comes from many types of engines, industries,
and commercial operations. Pollution sources that move, such as
trucks, snowblowers, bulldozers, and trains, are known as "mobile
sources." Examples of all other (non-mobile) sources of air
pollution include power plants, factories, and manufacturing
processes.
Mobile sources pollute the air through combustion
and fuel evaporation.
These emissions contribute greatly to air pollution nationwide and
are the primary cause of air pollution in many urban areas. Learn
more about how mobile sources contribute to four significant air
pollutants and how these pollutants affect human health and the
environment in the following pages:
Mobile sources also produce several other important air
pollutants, such as air
toxics and greenhouse gases.
Nationwide, mobile sources represent the largest contributor to air
toxics. Air toxics are pollutants known or suspected to cause cancer
or other serious health or environmental effects. Greenhouse gases,
such as carbon dioxide (CO2), trap heat in the Earth's atmosphere,
contributing to global climate change. |
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