Table 4-44: Estimated National Emissions of Particulate Matter (PM-2.5)a (Million short tons),,,,,,,,,,,,,,,,,
,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006
Total all sources,7.56,7.32,7.20,7.15,7.54,6.93,6.73,6.26,6.26,6.40,6.50,6.22,2.80,2.75,2.70,2.65,2.61
Highway vehicles,0.32,0.31,0.29,0.28,0.26,0.25,0.23,0.22,0.20,0.18,0.17,0.16,0.15,0.14,0.14,0.13,0.12
Other Highway,0.30,0.30,0.31,0.31,0.31,0.31,0.31,0.31,0.30,0.31,0.30,0.29,0.30,0.30,0.29,0.29,0.28
Fuel combustion,0.91,0.89,0.93,0.85,0.84,0.90,0.67,0.67,0.63,0.67,0.72,0.74,0.60,0.59,0.59,0.58,0.58
Industrial processesb,0.56,0.57,0.58,0.50,0.50,0.50,0.37,0.38,0.39,0.30,0.31,0.32,0.36,0.37,0.38,0.39,0.40
Waste disposal and recycling,0.23,0.24,0.24,0.29,0.27,0.25,0.43,0.44,0.46,0.44,0.33,0.33,0.22,0.22,0.23,0.23,0.24
Miscellaneousc,5.23,5.00,4.85,4.93,5.36,4.73,4.72,4.24,4.28,4.50,4.68,4.38,1.17,1.12,1.08,1.03,0.99
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a Particulate matter less than 2.5 microns in size.,,,,,,,,,,,,,,,,,
"b  Industrial processes comprises chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; solvent utilization; and storage and transportation.",,,,,,,,,,,,,,,,,
"c  Miscellaneous comprises nonroad gasoline- and diesel-powered construction, industrial, lawn and garden, farm, light-commercial, logging vehicles and other non-road sources; geogenic sources, agriculture and forestry, cooling towers, nontransportation-related fugitive dust, wildfires, managed burning, and other fugitive dust and combustion that could not accurately be allocated to specific source categories.",,,,,,,,,,,,,,,,,
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NOTE,,,,,,,,,,,,,,,,,
"Previous edition's data include all on road mobile sources and some nonroad mobile sources, since EPA changed the methodology to estimate emissions, the details of the data are not available, this data set only contains the on road mobile sources.",,,,,,,,,,,,,,,,,
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SOURCE ,,,,,,,,,,,,,,,,
"U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, Internet website http://www.epa.gov/ttn/chief/trends/index.html as of July 2007.",,,,,,,,,,,,,,,,
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