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

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
TOTAL all sources 13.04 7.67 7.12 45.45 50.94 42.46 61.07 53.06 R29.97 29.56 29.47 28.01 30.91 R27.08 R30.00 R31.21 R31.35 N
Transportation                                    
On-road vehicles 0.44 0.47 0.40 0.36 0.36 0.36 0.37 0.37 R0.35 0.35 R0.35 R0.33 0.32 R0.30 R0.35 R0.33 R0.31 0.30
Off-road                                    
Aircraft 0.02 0.03 0.03 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.05 0.04 0.04 0.04 0.04 0.04 0.04 0.04
Railroads 0.03 0.03 0.04 0.04 0.04 0.04 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.03 0.03 0.03 0.03 0.03
Marine vessels 0.01 0.01 0.02 0.03 0.03 0.03 0.04 0.04 0.04 0.05 0.05 0.04 0.04 0.04 0.04 0.04 R0.05 0.05
Other off-roadb <0.01 0.03 0.03 0.03 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 R0.05 R0.05 R0.05 0.05
Total transportation-fuel-related R0.50 0.57 0.52 0.50 0.51 0.51 0.54 0.54 R0.53 0.53 0.53 R0.50 0.49 R0.45 R0.50 R0.49 R0.47 0.46
Transportation-related fugitive dust                                    
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 R9.07 R9.46 R9.33 9.36
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 R2.40 R2.60 R2.66 2.73
Total transportation R0.50 0.57 0.52 17.22 17.44 17.15 18.82 18.11 R14.01 14.14 13.87 R14.39 14.40 R13.22 R11.98 R12.55 R12.46 12.54
Nontransportation                                    
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 R1.16 R1.08 R1.00 1.03
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 R0.65 R0.67 R0.67 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 0.30 0.31 0.31 0.59
Miscellaneousd 1.00 0.78 1.13 25.34 30.76 22.69 39.59 32.31 R13.46 R13.01 13.15 R11.25 14.18 11.45 R15.91 R16.61 R16.90 e8.84
Total nontransportation 12.54 7.10 6.60 28.22 33.50 25.31 42.26 34.97 R15.97 R15.43 15.60 13.62 16.51 13.87 R18.02 R18.66 R18.88 N

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 comprise 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.

e Miscellaneous data for 1999 does not include emissions from geogenic sources because the data was not estimated in 1999. The methodologies used for obtaining geogenic emission data are still being improved and current estimates will be revised at a later date.

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: 1970-1985, 1989-1999: U.S. Environmental Protection Agency,National Air Quality and Emissions Trends Report: 1999 (EPA-454/R-01-004) (Research Triangle Park, NC: March 2001), table A-6; available at Internet website http://www.epa.gov/oar/aqtrnd99/toc.html as of Sept. 5, 2001.

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

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.