Introduction

America's transportation system continues to change along with the population, work force, and economy. The following table puts those changes in perspective:

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Glossary

Air carrier - Certificated provider of scheduled and nonscheduled services.

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

6-4 Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2007

Index: 1990 = 1.0

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6-4 Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2007

Index: 1990 = 1.0

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Key: R = revised, PM-10 = airborne particulates of less than 10 microns, PM-2.5 = airborne particulates of less than 2.5...

6-2 U.S. Carbon Dioxide Emissions from Energy Use: 1985-2007

Million metric tons of carbon

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6-2 U.S. Carbon Dioxide Emissions from Energy Use: 1985-2007

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Key: R = Revised.

Notes: 2007 data are preliminary. One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are distributed...

6-1 New Passenger Car and Light Truck Fuel Economy Averages: Model Years 1985-2008

Miles per gallon

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6-1 New Passenger Car and Light Truck Fuel Economy Averages: Model Years 1985-2008

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Key: R = revised.

Notes: Fuel economy is miles divided by gallons. Whenever there are more than one fuel economy values, dividing the...

5-10 New Passenger Car and Light Truck Sales: Model Years 1985-2008

Millions of vehicles

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5-10 New Passenger Car and Light Truck Sales: Model Years 1985-2008

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Key: R = revised.

Notes: Data are based on Environmental Protection Agency (EPA) definitions of light trucks (gross vehicle weight of 8,500 pounds or...