Table 4-43: Estimated National Emissions of Particulate Matter (PM-10)a (Million short tons)

Table 4-43: Estimated National Emissions of Particulate Matter (PM-10)a (Million short tons)

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  1970 1975 1980 1985 1990 1995 1996 1997 1998 1999 2000
Total all sources 13.04 7.67 7.12 R41.40 R27.88 R25.93 R23.25 R24.10 R23.72 R24.04 24.88
Transportation, total R0.49 0.57 0.52 0.50 0.53 0.59 R0.49 R0.48 R0.46 R0.45 0.57
On-road vehicles 0.44 0.47 0.40 0.36 0.35 0.30 0.35 0.33 0.31 0.30 0.27
Off-road, total 0.05 0.10 0.12 0.14 0.18 0.15 0.15 0.16 0.16 0.16 0.15
Aircraft 0.02 0.03 0.03 0.04 0.04 0.04 0.01 R0.01 R0.01 R0.01 0.01
Railroads 0.03 0.03 0.04 0.04 0.05 0.03 0.03 0.03 0.03 0.03 0.03
Marine vessels 0.01 0.01 0.02 0.03 0.04 0.04 R0.07 R0.07 R0.07 R0.07 0.07
Other off-roadb < 0.01 0.03 0.03 0.03 0.04 0.04 0.05 0.05 0.05 0.05 0.05
Transportation-related fugitive dust, total R0.49 0.57 0.52 17.22 14.01 13.37 R11.97 R12.54 R12.45 R12.37 12.47
Unpaved highways N N N 11.64 11.23 10.36 9.07 9.46 9.33 R9.16 9.15
Paved highways N N N 5.08 2.25 2.41 2.40 2.60 2.66 R2.77 2.74
Nontransportation, total 12.54 7.10 6.60 R24.17 R13.87 R12.71 R11.29 R11.56 R11.27 R11.67 12.56
Fuel combustion 2.87 2.25 2.45 1.54 1.20 1.18 R0.98 R0.98 R0.91 R0.95 1.00
Industrial processesc 7.67 3.70 2.75 1.06 1.04 R0.94 0.65 0.67 0.67 0.68 0.70
Waste disposal and recycling 1.00 0.37 0.27 0.28 0.27 0.29 R0.53 R0.53 R0.53 R0.53 0.54
Miscellaneousd 1.00 0.78 1.13 R21.29 R11.37 R10.30 R9.13 R9.38 R9.15 R9.51 10.32

KEY: N = data do not exist; R = revised.

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.

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. Therefore, some estimates in this table may not match estimates produced in previous reports, and some trends may not be consistent across years in which major changes in methodology have occurred.

Numbers may not add to totals due to rounding.

SOURCES

1970, 1975: U.S. Environmental Protection Agency, personal communication, Sept. 5, 2002.

1980, 1985 and 1989-2000: Ibid, Current Emission Trends Summaries, available at internet website http://www.epa.gov/ttn/chief/trends/trends00/trends2000.pdf as of Oct. 17, 2002.

1986-87: Ibid, National Emission Trends Source Reports Database; available at Internet website www.epa.gov/air/data/nettier.html as of Sept. 5, 2001.

1988: National Air Pollutant Emission Trends: 1900-1998 (EPA-454/R-00-002) (Research Triangle Park, NC: March 2000), table A-2, available at Internet website http://www.epa.gov/ttn/chief/trends/trends98/browse.html as of Sept. 5, 2001.