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TABLE 1-1-4 - Transportation Air Pollutant Emissions from On-Road Mobile Sources: 1995-2007

TABLE 1-1-4 - Transportation Air Pollutant Emissions from On-Road Mobile Sources: 1995-2007

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Millions of short tons

  Carbon monoxide Nitrogen oxides
All sources Transportation, total Transportation (percent of total) All sources Transportation, total Transportation (percent of total)
1995 126.78 83.88 66 24.96 8.88 36
1996 128.86 78.61 61 24.79 8.73 35
1997 117.91 75.85 64 24.71 8.79 36
1998 115.38 73.24 63 24.35 8.62 35
1999 114.54 68.71 60 22.84 8.37 37
2000 114.47 68.06 59 22.60 8.39 37
2001 106.26 63.48 60 21.55 7.77 36
2002 111.06 60.60 55 21.14 7.87 37
2003 106.24 56.47 53 20.33 7.38 36
2004 101.43 52.35 52 19.52 6.90 35
2005 96.62 48.22 50 18.71 6.41 34
2006 92.13 44.73 49 17.69 5.97 34
2007 88.25 41.61 47 17.03 5.56 33

  Volatile organic compounds Sulfur dioxide
All sources Transportation, total Transportation (percent of total) All sources Transportation, total Transportation (percent of total)
1995 22.04 6.75 31 18.62 0.34 2
1996 20.87 6.22 30 18.39 0.30 2
1997 19.53 5.99 31 18.84 0.30 2
1998 18.78 5.86 31 18.94 0.30 2
1999 18.27 5.68 31 17.54 0.30 2
2000 17.51 5.33 30 16.35 0.26 2
2001 17.11 4.95 29 15.93 0.25 2
2002 21.16 4.92 23 14.78 0.25 2
2003 20.77 4.64 22 14.76 0.21 1
2004 20.37 4.36 21 14.74 0.18 1
2005 19.98 4.08 20 14.71 0.15 1
2006 19.16 3.88 20 13.51 0.12 1
2007 18.42 3.60 20 12.93 0.09 1

NOTE: Data include emissions by highway vehicles only.

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 August 2008.