5-2 Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2009

5-2 Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2009

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5-2 - Index of Key Air Pollutant Emissions from U.S. Transportation: 19902009. If you are a user with disability and cannot view this image, use the table version. If you need further assistance, call 800-853-1351.

Key: PM-10 = airborne particulates of less than 10 microns; PM-2.5 = airborne particulates of less than 2.5 microns.

Notes: Not all graph scales are comparable. The indices are calculated using data on emissions from highway vehicles only. Particulate matters include PM without condensibles. Ammonia data for 2003 through 2005 are revised. Data for 2006 through 2008 are revised.

Source: U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, available at http://www.epa.gov/ttn/chief/trends/index.html as of August 2011.