TABLE 72 Share of Selected Air Pollution Emissions by Mode: 2001

TABLE 72 Share of Selected Air Pollution Emissions by Mode: 2001


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  CO NOx VOCs PM-10
Highway gasoline 92.9 41.7 74.7 27.1
Highway diesel 1.4 37.5 3.6 37.8
Aircraft 5.1 0.8 0.3 0.9
Marine vessels 0.3 9.7 0.0 13.1
Railroad 0.2 9.6 0.6 7.4
Other 0.1 0.8 20.2 13.7

KEY: CO = carbon monoxide; NOx = nitrogen oxides; VOC = volatile organic compounds; PM-10 = particulate matter 10 microns in diameter or smaller.

NOTES: EPA no longer estimates lead emissions. Modal shares in 2000 were: highway gasoline vehicles, 4.1%; aircraft, 95.9%. Highway gasoline vehicles include: light-duty gas vehicles and motorcycles, light-duty gas trucks, and heavy-duty gas vehicles. Highway diesel includes heavy-duty diesel vehicles, light-duty diesel trucks and vehicles. Marine vessels include: coal, diesel, residual oil, gasoline and other. Other includes: diesel and gasoline recreational vehicles, airport service, railway maintenance, and recreational marine service. This table does not include farm, construction, industrial, logging, light commercial, and lawn and garden equipment.

SOURCE: U.S. Environmental Protection Agency (EPA), Office of Air Quality Planning and Standards, "National Emissions Inventory, Air Pollutant Emission Trends," available at, as of December 2002.