Table 4-42:  Estimated National Emissions of Volatile Organic CompoundsR (Million short tons) ,,,,,,,,,,,,,,,,,,,,
,1970,1975,1980,1985,1986,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001
Total all sources,34.66,30.76,31.11,27.40,26.79,26.74,26.97,25.56,24.12,23.58,23.07,22.73,22.57,22.04,20.87,19.53,18.78,19.38,19.70,17.96
"Transportation, total",17.81,16.39,14.94,13.47,13.17,12.87,12.10,11.32,10.54,10.05,9.55,9.05,8.55,8.05,7.55,7.33,7.21,7.07,6.68,6.22
On-road vehicles,16.91,15.39,13.87,12.35,12.05,11.75,10.96,10.17,9.39,8.86,8.33,7.80,7.28,6.75,6.22,5.99,5.86,5.61,5.33,4.87
Off-road,0.90,1.00,1.07,1.11,1.12,1.12,1.13,1.15,1.16,1.19,1.22,1.24,1.27,1.30,1.33,1.34,1.35,1.46,1.35,1.35
Aircraft,0.06,0.05,0.05,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.04,0.04,0.03,0.02
Railroads,0.04,0.04,0.05,0.04,0.04,0.03,0.03,0.04,0.04,0.04,0.04,0.04,0.04,0.04,0.04,0.04,0.04,0.04,0.04,0.04
Marine vessels,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03,0.03
Other off-roada,0.77,0.88,0.94,1.01,1.02,1.02,1.04,1.05,1.06,1.09,1.11,1.14,1.17,1.20,1.23,1.24,1.25,1.34,1.26,1.26
"Nontransportation, total",16.85,14.37,16.16,13.94,13.63,13.88,14.88,14.24,13.57,13.53,13.52,13.68,14.02,13.99,13.32,12.21,11.57,12.31,13.02,11.74
Fuel combustion,0.72,0.66,1.05,1.57,1.40,1.28,1.36,1.37,1.00,1.07,1.11,0.99,0.99,1.07,1.12,1.12,1.12,1.43,1.18,1.18
Industrial processesb,12.33,11.10,12.10,9.50,9.35,9.59,9.89,9.81,9.01,9.18,9.37,9.53,9.69,9.71,8.14,8.34,7.88,7.48,7.28,7.45
Waste disposal and recycling,1.98,0.98,0.76,0.98,0.97,0.95,0.96,0.94,0.99,1.00,1.01,1.05,1.05,1.07,0.51,0.52,0.54,0.53,0.54,0.54
Miscellaneousc,1.82,1.63,2.25,1.89,1.91,2.06,2.66,2.11,2.57,2.28,2.02,2.11,2.29,2.14,3.54,2.23,2.04,2.87,4.02,2.56
KEY:  R = revised.,,,,,,,,,,,,,,,,,,,,
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"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.",,,,,,,,,,,,,,,,,,
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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.  The most recent revision of these estimates is based on Version 2 of the 1999 National Emissions Inventory (NEI) and provides a generally consistent time trend of the estimates.  However, state-submitted data on mobile sources is only reflected in the estimates for 1999 and the EPA plans to correct this inconsistency in future publications.",,,,,,,,,,,,,,,,,,
Numbers may not add to totals due to rounding.,,,,,,,,,,,,,,,,,,
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SOURCE,,,,,,,,,,,,,,,,,,
"1970-2001: U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, available at Internet website http://www.epa.gov/ttn/chief/trends/ as of Aug. 14, 2003.  ",,,,,,,,,,,,,,,,,,
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