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  • The Sources of Air Pollution

    By definition, air pollution is a substance (or multiple substances) in the air that has harmful effects on people, animals, plants and property.

    Air pollution comes from many sources including:

    • Mobile sources such as cars, trucks, busses, motorcycles, planes and trains.
    • Stationary sources including power plants, factories, business and industry.
    • Agriculture, especially during tilling and harvesting seasons.
    • Natural sources including wildfires, wind, and volcanoes.
    • Additional sources include:
      • Gas-powered lawn and gardening equipment
      • Fires in fireplace, fire pit and barbecues
      • Fireworks
      • Paint products
      • Household chemicals
      • Burning garbage

    As required by the U.S. Environmental Protection Agency, Pima County DEQ monitors for criteria air pollutants:

    Here in Pima County, we sometimes see elevated levels of ground-level ozone during summer months and coarse particulate matter on windy days throughout the year or when wildfires are burning. The other pollutants are usually well below the National Ambient Air Quality Standards set for these criteria pollutants.

    Driving gasoline and diesel motor vehicles causes about half the air pollution we breathe in Pima County.
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    Department of Environmental Quality

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    Tucson, AZ 85701

    Phone: (520) 724-7400
    Fax: (520) 838-7432

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