Table 4-45. Estimated National Emissions of Sulfur Dioxide (Million short tons)

Table 4-45. Estimated National Emissions of Sulfur Dioxide (Million short tons)

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  1970 1975 1980 1985 1990 1995 1996 1997 1998
Transportation                 
On-road vehicles 0.41 0.50 0.52 0.52 0.54 0.30 0.32 0.32 0.33
Off-road                 
Aircraft <0.01 <0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
Railroads 0.04 0.04 0.05 0.06 0.12 0.11 0.11 0.12 0.11
Marine vessels 0.04 0.05 0.12 0.14 0.25 0.24 0.24 0.25 0.26
Total transportation 0.49 R0.59 0.70 0.73 R0.92 R0.66 0.68 R0.70 0.71
Nontransportation                 
Fuel combustion 23.46 22.66 21.39 20.02 20.29 16.23 R16.32 R16.73 16.72
Industrial processesa 7.09 4.68 3.77 2.43 1.86 1.59 R1.41 R1.46 1.46
Waste disposal and recycling 0.01 0.05 0.03 0.03 0.04 0.05 R0.04 R0.04 0.04
Miscellaneousb 0.11 0.02 0.01 R0.44 R0.55 0.65 R0.67 R0.69 0.71
Total nontransportation 30.67 27.41 25.20 R22.92 R22.74 18.52 R18.44 R18.92 18.93
TOTAL all sources31.16 28.01 25.91 R23.66 R23.66 R19.18 R19.12 R19.62 19.65

a Industrial processes comprise chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; solvent utilization; and storage and transport.
b Miscellaneous comprises nontransportation-related fugitive dust, nonroad gasoline, nonroad diesel, other nonroad sources and other miscellaneous combustion that could not be accurately allocated to specific source categories.

KEY: R = revised

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 methodology changes have occurred. Numbers may not add to totals due to rounding.

SOURCES: U.S. Environmental Protection Agency, National Air Pollutant Emission Trends: 1900-1998 (EPA-454/R-00-002) (Research Triangle Park, NC: March 2000), table A-4; also available at Internet site www.epa.gov/ttn/chief/trends98/emtrnd.html, as of Aug. 8, 2000