Figure 1 - National Transportation Emissions Trends Index: 1970-1999

(Index: 1970 = 1.0; 1990 = 1.0 for PM-2.5 and ammonia)

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KEY: CO = carbon monoxide; NOx = nitrogen oxides; VOC = volatile organic compounds; PM-10 = particulate...

Figure 2 - Domestic Ton-Miles, Gross Domestic Product, and Resident Population: 1975-1999

(Index: 1975 = 1.0)

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Figure 1 - Energy Intensities of Passenger Modes: 1980-1999

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KEY: Btu = British thermal units.

SOURCE: Stacy C. Davis, Transportation Energy Data Book, Edition 21 (Oak Ridge, TN: Oak Ridge National Laboratory, 2001),...

Figure 1 - U.S. Petroleum Use by Sector: 1973-2000

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Figure 1 - U.S. Civil and Military Aircraft Production: 1991-2001

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NOTE: Data for 2001 are preliminary. Data for 2001 military aircraft production are not available.

SOURCES: 1969-1999: Aerospace Industries...

Figure 2 - Commercial Carrier Accident Rates: 1990-2001

(Per 100,000 flight hours)

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Figure 1 - International Overnight Visitors to the United States: 1990-2000

Trips of one or more nights

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NOTE: Data for Canada and Mexico do not include same-day travel.

SOURCES: U.S. Department of Commerce,...

Table 2 - Occupational Fatalities in Transportation Occupations: 2000

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Figure 2 - Households Without Vehicles in Urban, Suburban, and Rural Areas: 1989 and 1999

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NOTE: MSAs = metropolitan statistical areas (see box).

SOURCE: U.S. Department of Housing and Urban Development and U.S....

Figure 1 - Transit Ridership by Mode: 1990-2000

(Millions of unlinked trips)

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