Glossary

Air carrierCertificated provider of scheduled and nonscheduled services.

Chained dollarsA method to measure real changes in dollar values between years that uses chain-type indices, rather than constant dollars. The method first calculates the real changes between adjacent...

Figure 11 Index of Key Air Pollutant Emissions from U.S. Transportation: 1970-99

Index: 1970 = 1.0, 1990 = 1.0 for PM-2.5 and ammonia

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Figure 11 Index of Key Air Pollutant Emissions from U.S. Transportation: 1970-99

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Key: NOx = oxides of nitrogen; PM-10 and PM-2.5 = airborne particulates of less than 10 microns or 2.5 microns, respectively; CO = carbon monoxide; VOC...

Figure 10 New Passenger Car and Light Truck Fuel Economy Averages: Model Years 1978-2000

(Miles per gallon)

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Figure 10 New Passenger Car and Light Truck Fuel Economy Averages: Model Years 1978-2000

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Source: U.S. Department of Transportation, National Highway Traffic Safety Administration,

Automotive Fuel Economy Program,...

Figure 9 U.S. Carbon Dioxide Emissions from Energy Use

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Key: P = 2000 data are preliminary.

Notes: One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are spread across end-user...

Figure 9 U.S. Carbon Dioxide Emissions from Energy Use

(Million metric tons of carbon)

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Figure 8 Transportation's Share of U.S. Petroleum Use

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Source: U.S. Department of Energy, Energy Information Administration,Annual Energy Review 2000 (Washington, DC: August 2001), table, 5.12.

Figure 8 Transportation's Share of U.S. Petroleum Use

(Million Barrels Per Day)

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Figure 7 U.S. Petroleum Production and Consumption

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SOURCE: U.S. Department of Energy, Energy Information Administration, annual Energy Review 2000 (Washington, DC: August 2001), table 5.1.