TABLE 5-3 - Transportation Air Pollutant Emissions From On-Road Mobile Sources: 2004-2008

TABLE 5-3 - Transportation Air Pollutant Emissions From On-Road Mobile Sources: 2004-2008

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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)
2004 99.04 52.56 53.1 19.79 6.95 35.1
2005 93.03 48.54 52.2 19.12 6.49 34.0
2006 87.92 45.32 51.5 18.11 6.06 33.5
2007 82.80 42.09 50.8 17.32 5.64 32.5
2008 77.69 38.87 50.0 16.34 5.21 31.9

  Volatile organic compounds Sulfur dioxide
All sources Transportation, total Transportation (percent of total) All sources Transportation, total Transportation (percent of total)
2004 19.79 4.38 22.1 14.82 0.18 1.2
2005 18.42 4.11 22.3 14.84 0.15 1.0
2006 17.59 3.88 22.1 13.66 0.12 0.9
2007 16.76 3.65 21.8 13.01 0.09 0.7
2008 15.93 3.42 21.5 11.43 0.06 0.6

NOTE: Transportation, total 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 November 2009 as reported in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, tables 4-40, 4-41, 4-42, and 4-45, available at http://www.bts.gov/publications/national_transportation_statistics/ as of January 2010.