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TABLE K-5 Transportation Air Pollutant Emissions: 1992-2002

Millions of short tons

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Carbon Monoxide

  All Sources Transportation, total Transportation (percent)
1992 140.90 103.89 74
1993 135.90 98.67 73
1994 133.56 93.44 70
1995 126.78 88.22 70
1996 128.86 82.99 64
1997 117.91 80.22 68
1998 115.38 77.64 67
1999 114.54 73.64 64
2000 114.47 72.49 63
2001 106.30 67.99 64
2002 112.05 64.66 58

Nitrogen Oxides

  All Sources Transportation, total Transportation (percent)
1992 25.26 11.45 45
1993 25.36 11.33 45
1994 25.35 11.22 44
1995 24.96 11.10 44
1996 24.79 10.99 44
1997 24.71 11.02 45
1998 24.35 10.82 44
1999 22.85 10.36 45
2000 22.60 10.57 47
2001 21.55 9.95 46
2002 21.10 9.44 45

Volatile Organic Compounds

  All Sources Transportation, total Transportation (% of total)
1992 23.07 9.55 41
1993 22.73 9.05 40
1994 22.57 8.55 38
1995 22.04 8.05 37
1996 20.87 7.56 36
1997 19.53 7.33 38
1998 18.78 7.21 38
1999 18.78 7.10 38
2000 17.51 6.68 38
2001 17.12 6.31 37
2002 16.54 5.93 36

Sulfur Dioxide

  All Sources Transportation, total Transportation (% of total)
1992 22.08 0.67 3
1993 21.77 0.63 3
1994 21.35 0.60 3
1995 18.62 0.56 3
1996 18.39 0.53 3
1997 18.84 0.54 3
1998 18.94 0.53 3
1999 17.55 0.54 3
2000 16.35 0.49 3
2001 15.93 0.47 3
2002 15.35 0.49 3

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/ as of Dec. 21, 2004.
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