Figure 1 - National Transportation Emissions Trends Index: 1970-1998

Figure 1 - National Transportation Emissions Trends Index: 1970-1998

1970 = 1.0; 1990 = 1.0 for PM-2.5 and ammonia

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Carbon monoxide (CO)
Figure 1a - National Transportation Emissions Trends Index for Carbon monoxide (CO): 1970-1998. If you are a user with a disability and cannot view this image, please call 800-853-1351 for further assistance.

Volatile organic compounds (VOC)
Figure 1b - National Transportation Emissions Trends Index for Volatile organic compounds (VOC): 1970-1998. If you are a user with a disability and cannot view this image, please call 800-853-1351 for further assistance.

Particulate matter 2.5 microns in diameter or smaller (PM-2.5)
Figure 1c - National Transportation Emissions Trends Index for Particulate matter 2.5 microns in diameter or smaller (PM-2.5): 1970-1998. If you are a user with a disability and cannot view this image, please call 800-853-1351 for further assistance.

Ammonia
Figure 1d - National Transportation Emissions Trends Index for Ammonia: 1970-1998. If you are a user with a disability and cannot view this image, please call 800-853-1351 for further assistance.

Nitrogen oxides (NOx)
Figure 1e - National Transportation Emissions Trends Index for Nitrogen oxides (NOx): 1970-1998. If you are a user with a disability and cannot view this image, please call 800-853-1351 for further assistance.

Particulate matter 10 microns in diameter or smaller (PM-10)
Figure 1f - National Transportation Emissions Trends Index for Particulate matter 10 microns in diameter or smaller (PM-10): 1970-1998. If you are a user with a disability and cannot view this image, please call 800-853-1351 for further assistance.

Lead
Figure 1g - National Transportation Emissions Trends Index for Lead: 1970-1998. If you are a user with a disability and cannot view this image, please call 800-853-1351 for further assistance.

SOURCE: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Pollutant Emission Trends: 19001998, EPA 454/R-00-002 (Research Triangle Park, NC:March 2000),also available at http://www.epa.gov/ttn/chief/trends/, as of May 18, 2001.