Figure 10-2
Selected Transportation Air Pollutant Emissions by Type: 1991–2001

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KEY: PM-10 = particulate matter 10 microns in diameter or smaller.

SOURCE: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Emissions Inventory, Air Pollutant Emission Trends, available at http://www.epa.gov/ttn/chief/trends/index.html/, as of August 2003.