Table 4-45: Estimated National Emissions of Sulfur Dioxide

Table 4-45: Estimated National Emissions of Sulfur Dioxide

(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 2001 2002
TOTAL all sources 31.22 28.04 25.93 23.31 22.52 22.27 22.69 22.81 23.08 22.38 22.08 21.77 21.35 18.62 18.39 18.84 18.94 (R) 17.55 (R) 16.35 (R) 15.93 15.35
Transportation, total 0.51 0.57 0.63 0.69 0.71 0.72 0.72 0.73 0.73 0.70 0.67 0.63 0.60 0.56 0.53 0.54 0.53 0.54 0.49 (R) 0.47 0.49
On-road vehicles 0.27 0.33 0.39 0.46 0.47 0.48 0.49 0.50 0.50 0.47 0.44 0.40 0.37 0.34 0.30 0.30 0.30 0.30 0.26 (R) 0.25 0.28
Off-road, total 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.24 0.23 (R) 0.23 0.22
Aircraft <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01
Railroads 0.08 0.07 0.07 0.06 0.06 0.05 0.05 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.05
Marine vessels 0.16 0.16 0.16 0.17 0.18 0.18 0.18 0.17 0.17 0.17 0.17 0.16 0.16 0.16 0.16 0.17 0.17 0.18 0.16 0.16 0.16
Nontransportation, total 30.70 27.47 25.30 22.61 21.81 21.54 21.97 22.08 22.34 21.68 21.42 21.14 20.75 18.06 17.86 18.30 18.41 (R) 17.00 (R) 15.86 (R) 15.46 14.86
Fuel combustion 23.46 22.66 21.39 20.02 19.43 19.43 19.76 19.92 20.29 19.80 19.49 19.25 18.89 16.23 16.25 16.65 16.74 (R) 15.34 (R) 14.16 (R) 13.74 13.17
Industrial processesa 7.09 4.68 3.77 2.43 2.22 1.94 2.02 1.98 1.86 1.68 1.72 1.65 1.62 1.59 1.37 1.43 1.43 (R) 1.33 (R) 1.38 (R) 1.43 1.37
Waste disposal and recycling 0.01 0.05 0.03 0.03 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.07 0.06 0.05 0.03 0.03 0.03 0.03 0.03 0.04 0.03
Miscellaneousb 0.15 0.08 0.10 0.13 0.13 0.14 0.16 0.15 0.15 0.16 0.17 0.17 0.19 0.19 0.20 0.20 0.20 (R) 0.30 (R) 0.28 (R) 0.26 0.30

KEY: R = revised.

a Industrial processes comprises 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, agriculture and forestry, nonroad gasoline, nonroad diesel, other nonroad sources and other miscellaneous combustion 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 and, therefore, some estimates in this table may not match estimates produced in previous reports.

Numbers may not add to totals due to rounding.

SOURCE

1970-2002: U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, Internet website http://www.epa.gov/ttn/chief/trends/ as of Dec. 21, 2004.