Mobile Source Emissions
http://www.epa.gov/otaq/invntory/overview/index.htm

Office of Transportation and Air Quality, Environmental Protection Agency

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This site presents information on air pollution from engines, vehicles, and other machines that move. It discusses what mobile source emissions are, and features information about common exhaust pollutants such as carbon monoxide, hydrocarbons, nitrogen oxides and particulate matter. It also provides information about solutions and what you can do to reduce pollution.

Subject: Environmental Science:Air Quality:Pollutants, Dust and Particulates, Geoscience:Atmospheric Science:Meteorology:Air quality, Air quality:Pollutants, Dust and Particulates
Resource Type: Scientific Resources:Overview/Reference Work
Theme: Teach the Earth:Course Topics:Environmental Science, Atmospheric Science, Teach the Earth:Teaching Topics:Weather