In general, the largest man-made sources of air pollution are: Vehicles Factories and power plants Small engines (e.g., lawn mowers, weed trimmers) Consumer products (e.g., paint, aerosol cans) Residential burning (e.g., wood stoves, open burning) For regulatory purposes, these sources are typically grouped into three categories: Stationary sources (e.g., factories, power plants) Mobile sources (e.g., cars, trucks, airplanes, locomotives, boats) Area sources (e.g., small engines, consumer products, wood stoves) Air Quality Trends in the U.S. Air quality in most areas in the U.S. has improved significantly since the passage of the Clean Air Act in 1963 (EPA, 1997).
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lawn mowers, weed trimmers) Consumer products (e.g. the largest man-made sources of air pollution cars, trucks, airplanes, locomotives, boats) Area sources
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T:since the passage of the Clean Air Act in 1963