Table 4-50: Estimated National Emissions of Sulfur Dioxide (Million short tons)

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  1970 1975 1980 1985 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 (R) 2006 (R) 2007 (R) 2008 (R) 2009 (R) 2010 (R) 2011 (R) 2012 2013
TOTAL all sources 31.22 28.04 25.93 23.31 23.08 22.37 22.08 21.77 21.35 18.62 18.39 18.84 18.94 17.55 16.35 15.93 (R) 15.03 (R) 14.78 (R) 14.54 (R) 14.53 13.09 11.66 10.31 9.08 7.75 6.50 5.22 4.83
Highway vehicles 0.27 0.33 0.39 0.46 0.50 0.47 0.44 0.40 0.37 0.34 0.30 0.30 0.30 0.30 0.26 0.25 (R) 0.28 (R) 0.25 (R) 0.21 (R) 0.17 0.11 0.04 0.04 0.04 0.04 0.03 0.03 0.03
Off-Highway 0.28 0.30 0.32 0.35 0.37 0.38 0.39 0.39 0.40 0.41 0.41 0.42 0.43 0.48 0.44 0.44 (R) 0.72 (R) 0.65 (R) 0.58 (R) 0.51 0.40 0.29 0.20 0.22 0.12 0.09 0.08 0.08
Fuel combustion 23.46 22.66 21.39 20.02 20.29 19.80 19.49 19.25 18.89 16.23 16.25 16.65 16.74 15.34 14.16 13.74 12.80 12.69 12.58 12.71 11.52 10.33 9.14 7.95 6.75 5.56 4.29 3.90
Industrial processesa 7.09 4.68 3.77 2.43 1.86 1.68 1.72 1.65 1.62 1.59 1.37 1.43 1.43 1.33 1.38 1.43 1.06 1.04 1.01 0.99 0.92 0.84 0.77 0.71 0.64 0.58 0.58 0.58
Waste disposal and recycling 0.01 0.05 0.03 0.03 0.04 0.04 0.04 0.07 0.06 0.05 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02
Miscellaneous 0.11 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.01 0.02 0.01 0.01 0.07 0.07 0.04 0.13 0.13 0.13 0.13 0.13 0.13 0.14 0.15 0.17 0.22 0.22 0.22

KEY: R = revised.

aIndustrial processes consists of chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; solvent utilization; and storage and transport.

NOTE

Details may not add up to totals due to rounding in the source.

SOURCE

U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, available at http://www.epa.gov/ttn/chief/trends/index.html as of Dec. 6, 2013.