83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02

1983-02: 54% decrease 1993-02: 39% decrease

FIGURE 4-9. SO2 air quality from 1983 to 2002. (From EPA, Latest Findings on National Air Quality 2002 Status and Trends, Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, U.S. Government Printing Office, Washington, D.C., August 2003.)

|^]Fuel Combustion ^industrial Processes [^¡Transportation

FIGURE 4-9. SO2 air quality from 1983 to 2002. (From EPA, Latest Findings on National Air Quality 2002 Status and Trends, Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, U.S. Government Printing Office, Washington, D.C., August 2003.)

|^]Fuel Combustion ^industrial Processes [^¡Transportation

1983-02: 33% decrease 1993-02: 31% decrease

FIGURE 4-10. SO2 emissions from 1983 to 2002. (From EPA, Latest Findings on National Air Quality 2002 Status and Trends, Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, U.S. Government Printing Office, Washington, D.C., August 2003.)

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