Table 4-45:  Estimated National Emissions of Sulfur Dioxide (Million short tons),,,,,,,,,,,,,,,,,,,,,,,,,
,1970,1975,1980,1985,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,,,,
TOTAL all sources,31.22,28.04,25.93,23.31,23.08,22.37,22.08,21.77,21.35,18.62,18.39,18.84,18.94,17.54,16.35,15.93,14.62,15.02,14.67,14.63,13.77,,,,
Highway vehicles,0.27,0.33,0.39,0.46,0.50,0.47,0.44,0.40,0.37,0.34,0.30,0.30,0.30,0.30,0.26,0.25,0.26,0.24,0.22,0.21,0.19,,,,
Off-Highway,0.28,0.30,0.32,0.35,0.37,0.38,0.39,0.39,0.40,0.41,0.41,0.42,0.43,0.48,0.44,0.44,0.52,0.49,0.47,0.45,0.43,,,,
Fuel combustion,23.46,22.66,21.39,20.02,20.29,19.80,19.49,19.25,18.89,16.23,16.25,16.65,16.74,15.34,14.16,13.74,12.66,13.09,12.77,12.76,11.93,,,,
Industrial processesa,7.09,4.68,3.77,2.43,1.86,1.68,1.72,1.65,1.62,1.59,1.37,1.43,1.43,1.33,1.38,1.43,1.06,1.07,1.08,1.10,1.11,,,,
Waste disposal and recycling,0.01,0.05,0.03,0.03,0.04,0.04,0.04,0.07,0.06,0.05,0.03,0.03,0.03,0.03,0.03,0.04,0.03,0.03,0.03,0.03,0.03,,,,
Miscellaneousb,0.11,0.02,0.01,0.01,0.01,0.01,0.01,0.01,0.02,0.01,0.02,0.01,0.01,0.07,0.07,0.04,0.11,0.10,0.10,0.09,0.09,,,,
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"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. ",,,,,,,,,,,,,,,,,,,,,,,,,
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NOTE,,,,,,,,,,,,,,,,,,,,,,,,,
"Previous edition's data include all on road mobile sources and some nonroad mobile sources, since EPA changed the methodology to estimate emissions, the details of the data are not available, this data set only contains the on road mobile sources.",,,,,,,,,,,,,,,,,,,,,,,,,
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SOURCE ,,,,,,,,,,,,,,,,
"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/index.html as of July 2007.",,,,,,,,,,,,,,,,