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| Air
pollution comes from a wide variety of
sources. It comes from large industrial facilities, as well as from
things we use in our daily lives such as cars and trucks, paints, and
aerosol spray products. For convenience, we have grouped air pollution
sources into five major categories that are listed below. |
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| Mobile Sources |
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| On-Road Sources |
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| Sources
of on-road air pollution include automobiles, motorcycles, and trucks. Emission Data |
| Off-Road Sources |
| Off-road
mobile sources include the following categories: small off-road engines
and equipment, off-road recreational vehicles, farm and construction
equipment, forklifts, locomotives, commercial marine vessels, and
marine pleasure craft. Emission Data |
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| Stationary Sources |
| Stationary sources of air pollution include
non-mobile sources such as power plants, refineries, and manufacturing
facilities. Emission Data |
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| Areawide Sources |
| Areawide sources of pollution are those where
the emissions are spread over a wide area, such as consumer products,
fireplaces, road dust, and farming operations. Emission Data |
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| Natural Sources |
| Natural sources are non-manmade emission
sources, which include biological and geological sources, wildfires,
windblown dust, and biogenic emissions from plants and trees. Emission Data |
This
page last reviewed April 14, 2008
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