6-4 Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2006

6-4 Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2006

Index: 1990 = 1.0

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Figure 6-4 - Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2006. 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 or email answers@bts.gov.

Key: PM-10 and PM-2.5 = airborne particulates of less than 10 microns or 2.5 microns, respectively.

Notes: Data in the previous edition include all onroad mobile sources and some nonroad mobile sources. EPA revised the emissions estimation methodology for onroad mobile sources.

Source: U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, Internet website http://www.epa.gov/ttn/chief/trends/index.html as of September 2007.