Table 4-43:  Estimated National Emissions of Particulate Matter (PM-10)a (Million short tons),,,,,,,,,,,,,,,,,,,,,
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,1970,1975,1980,1985,1986,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002
Total all sources,13.02,7.56,7.01,41.32,40.53,40.79,42.83,40.83,27.75,27.35,27.10,27.36,28.61,25.82,22.86,22.91,22.89,(R) 23.50,(R) 23.75,(R) 22.89,22.15
"Transportation, total",N ,N ,N ,17.24,17.44,17.14,18.78,18.06,13.97,14.08,13.81,14.34,14.35,13.19,11.87,12.45,12.36,(R) 11.83,11.92,(R) 11.37,10.99
"Transportation-fuel-related, total",0.58,0.56,0.53,0.51,0.51,0.50,0.50,0.50,0.49,0.48,0.46,0.45,0.44,0.42,0.41,0.39,0.38,0.36,0.35,(R) 0.33,0.32
On-road vehicles,0.48,0.46,0.43,0.41,0.40,0.40,0.40,0.39,0.39,0.37,0.35,0.34,0.32,0.30,0.29,0.27,0.26,0.24,(R) 0.23,(R) 0.21,0.20
"Off-road, total",0.10,0.10,0.10,0.10,0.11,0.11,0.11,0.11,0.11,0.11,0.11,0.11,0.12,0.12,0.12,0.12,0.12,0.12,0.12,0.12,0.12
Aircraft,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01,<0.01
Railroads,0.03,0.03,0.03,0.02,0.02,0.02,0.02,0.02,(R) 0.07,0.02,0.02,(R) 0.03,0.03,0.03,(R) 0.07,(R) 0.07,(R) 0.07,0.02,(R) 0.03,(R) 0.03,0.02
Marine vessels,0.04,0.04,0.04,(R) 0.05,0.05,0.05,0.05,0.04,N,0.04,0.04,0.04,(R) 0.05,0.05,N,N,N,0.04,0.04,0.04,0.04
Other off-roadb,0.03,0.03,0.03,0.03,0.03,0.03,0.04,0.04,0.04,0.04,0.04,0.04,0.04,0.05,0.05,0.05,0.05,0.05,0.05,0.05,0.05
"Transportation-related fugitive dust, total",N,N ,N ,16.72,16.94,16.64,18.28,17.57,13.48,13.61,13.34,13.89,13.91,12.77,11.47,12.05,11.99,(R) 11.47,11.57,(R) 11.04,10.67
Unpaved highways,N ,N ,N ,11.64,11.67,11.11,12.38,11.80,11.23,11.21,10.92,11.43,11.37,10.36,9.07,9.46,9.32,(R) 8.71,8.75,(R) 8.95,8.60
Paved highways,N ,N ,N ,5.08,5.26,5.53,5.90,5.77,2.25,2.40,2.42,2.46,2.54,2.41,2.40,2.60,2.66,(R) 2.75,2.82,(R) 2.09,2.08
"Nontransportation, total",12.44,7.00,6.48,24.09,23.09,23.65,24.05,22.77,13.78,13.26,13.29,13.02,14.26,12.62,10.98,10.46,10.53,(R) 11.67,(R) 11.82,(R) 11.52,11.15
Fuel combustion,2.87,2.25,2.45,1.54,1.42,1.33,1.38,1.38,1.20,1.15,1.18,1.12,1.11,1.18,0.91,0.91,0.84,(R) 1.58,(R) 1.47,(R) 1.49,1.37
Industrial processesc,7.67,3.70,2.75,1.06,1.05,1.02,1.03,1.03,1.04,0.99,0.99,0.91,0.91,0.95,0.65,0.67,0.67,(R) 0.69,(R) 0.71,(R) 0.81,0.68
Waste disposal and recycling,1.00,0.37,0.27,0.28,0.27,0.27,0.26,0.25,0.27,0.28,0.28,0.33,0.31,0.29,0.45,0.47,0.49,(R) 0.47,(R) 0.36,(R) 0.36,0.44
Miscellaneousd,0.90,0.68,1.00,21.21,20.35,21.03,21.38,20.11,11.28,10.85,10.84,10.66,11.93,10.21,8.97,8.42,8.53,(R) 8.93,(R) 9.28,(R) 8.86,8.65
KEY: N = data do not exist; R = revised.,,,,,,,,,,,,,,,,,,,,,
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a  Fine particulate matter less than 10 microns.,,,,,,,,,,,,,,,,,,,,,
"b  Other off-road comprises nonroad gasoline- and diesel-powered recreational, airport service and railway maintenance vehicles, and recreational marine vessels.",,,,,,,,,,,,,,,,,,,,,
"c  Industrial processes comprises chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; solvent utilization; and storage and transport.",,,,,,,,,,,,,,,,,,,,,
"d  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 combustion sources that could not be accurately allocated to specific source categories.",,,,,,,,,,,,,,,,,,,,,
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NOTES,,,,,,,,,,,,,,,,,,,,,
"The methodologies used to estimate emissions constantly evolve and undergo major changes.  These improved methods are often used to revise estimates for previous years and, therefore, some estimates in this table may not match estimates produced in previous reports.   ",,,,,,,,,,,,,,,,,,,,,
Numbers may not add to totals due to rounding.,,,,,,,,,,,,,,,,,,,,,
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SOURCE,,,,,,,,,,,,,,,,,,,,,
"
1970-2002: 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/ as of Dec. 21, 2004.  ",,,,,,,,,,,,,,,,
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