Key Air Emissions

Transportation in 2001 emitted 66 percent of the nation’s carbon monoxide (CO), 47 percent of nitrogen oxides (NOx, 35 percent of volatile organic compounds (VOC), 5 percent of particulates, 6 percent of ammonia, and 4 percent of sulfur dioxide.1 Highway vehicles...

Figure 73 - Transportation Air Emissions by Type of Pollutant: 1991-2001

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NOTES: Revisions to previous estimates are all related to the development of the 1999 National Emissions Inventory (NEI).  The...

Figure 5 - Change in Passenger-Miles by Selected Mode: 1990-2000

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NOTES: Transit includes motor bus, heavy rail, commuter rail, light rail, ferryboat, trolley bus, demand responsive, and others. Motor bus...

Figure 37 - Average Transit Fare per Passenger-Mile: Fiscal Years 1990-2000

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Modes included are heavy, commuter, and light rail; bus; demand responsive; trolley bus; ferryboat; vanpool; tramway; monorail; automated guideway;...

Figure 79 - Hazardous Materials Transportation Incidents by Mode: 1991-2001

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NOTES: Water data are not included. On an average annual basis, 9 incidents are reported by vessels. Two injuries were reported in 1998; none in...

Figure 8 - Modal Shares of Domestic Freight Ton-Miles: 2000

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SOURCES: Air, pipeline, and water—U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS), National Transportation Statistics...

Figure 29 - Modal Share of Person Trips: 2001

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NOTE: The 2001 National Household Travel Survey “travel period” data were not available when this report was prepared. Without these data, vacation trips and...

Figure 58 - Saint Lawrence Seaway Lock Delays by Cause: 1990-2001

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NOTES: “Weather-related” includes poor visibility and high wind/ice; “All other” includes vessel incidents, lock equipment...

Figure 104 - Federal, State, and Local Government Transportation-Related Revenues: 1990-2000

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SOURCES: All except as noted—U.S. Department of Transportation, Bureau of Transportation Statistics, "Government...

Figure 91 - Average Age of Selected Urban Transit Vehicles: 1990-2000

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NOTES: Full-size buses have more than 35 seats.

SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics,...