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Click a state on the map or list below to bring up a county index to air-pollution source sheets. The sheets show pollutants graded C or worse for either emissions or measured concentrations. The percentage at the end of a line is the contribution to that pollutant from the stated source. Only the major 80% sources are listed. The county seat follows the county name. A convenient reference for sources is EPA’s AIRData at http://www.epa.gov/air/data/. Use the “tier” report to obtain point, area, and mobile sources by county within a state. Especially for PM10, PM2.5, and NH3, ask to see Tier 2 source categories as well as Tier 1, because dominant sources are all |
under the Tier 1 “miscellaneous” category. Another
summary of sources is the EPA report National Air Pollutant Emissions Trends,
1990-1998 at http://www.epa.gov/ttn/chief/trends/ Hazardous Air Pollutant (HAP) and acrolein sources can be
found in EPA’s National Toxics Inventory at http://www.epa.gov/ttn/chief/nti/,
and specifically at ftp://ftp.epa.gov/pub/ |
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