Table 4-42: Estimated National Emissions of Volatile Organic Compounds (Million short tons)

Table 4-42: Estimated National Emissions of Volatile Organic Compounds (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
Total all sources 30.98 26.08 R26.34 24.43 23.62 23.47 24.31 22.51 R21.05 R21.25 R20.86 R21.10 R21.68 R20.92 R19.92 R20.33 R19.28 R19.44 20.38
Transportation, total 13.97 11.64 10.16 10.64 10.12 9.74 9.56 8.41 7.63 7.85 7.46 7.52 7.75 7.00 R7.19 R7.09 R7.10 R6.95 6.64
On-road vehicles 12.97 10.55 8.98 9.38 8.87 8.48 8.29 7.19 6.44 6.66 6.29 6.35 6.56 5.82 5.54 5.44 5.44 R5.33 5.04
Off-road 1.00 1.09 1.18 1.26 1.25 1.26 1.27 1.22 1.18 1.19 1.17 1.17 1.19 1.19 1.65 1.66 1.66 1.62 1.61
Aircraft 0.10 0.12 0.15 0.17 0.17 0.18 0.19 0.19 0.18 0.18 0.18 0.18 0.18 0.18 R0.03 R0.03 R0.03 R0.03 0.03
Railroads 0.02 0.03 0.03 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 0.05 0.05 0.05
Marine vessels 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.04 0.03 R0.04 R0.04 R0.04 R0.04 0.04
Other off-roada 0.87 0.93 0.98 1.03 1.02 1.01 1.01 0.96 0.92 0.92 0.91 0.91 0.92 R0.93 R1.53 R1.54 R1.54 R1.50 1.49
Nontransportation, total 17.01 14.45 16.17 13.80 13.50 13.73 14.76 R14.10 R13.43 R13.41 R13.40 R13.58 R13.93 R13.92 R12.73 R13.23 R12.18 R12.49 13.75
Fuel combustion 0.72 0.66 1.05 1.57 1.40 1.28 1.36 1.37 1.01 1.08 R1.12 0.99 0.99 1.07 R1.13 R1.12 R1.12 R1.14 1.21
Industrial processesb 12.33 11.10 12.10 9.50 9.35 9.58 9.90 9.81 9.01 9.18 9.37 9.53 9.69 9.71 8.12 8.34 7.88 R7.43 7.45
Waste disposal and recycling 1.98 0.98 0.76 0.98 0.97 0.95 0.96 0.94 0.99 1.00 1.01 1.05 1.05 1.07 R0.56 R0.56 R0.57 R0.57 0.58
Miscellaneousc 1.98 1.71 2.26 1.75 1.78 1.92 2.54 1.97 R2.42 R2.15 R1.91 R2.01 R2.21 R2.07 R2.92 R3.21 R2.61 R3.35 4.51

KEY: R = revised.

a Other off-road comprises nonroad gasoline- and diesel-powered recreational, airport service and railway maintenance vehicles, and recreational marine vessels.

b Industrial processes comprises chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; and solvent utilization, storage, and transport.

c Miscellaneous comprises nonroad gasoline- and diesel-powered construction, industrial, lawn and garden, farm, light-commercial, logging vehicles, and other nonroad sources; geogenic sources, catastrophic and accidental releases, health services, cooling towers, nontransportation-related fugitive dust, agriculture and forestry, structural fires, agriculture fires, slash/prescribed burning, forest wildfires, 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, National Air Quality and Emissions Trends Report: 1999 (EPA-454/R-01-004) (Research Triangle Park, NC: March 2001), table A-2; available at Internet website http://www.epa.gov/oar/aqtrnd99/toc.html as of Sept. 5, 2001.

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: Ibid, 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.