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Percent Change in National Air Quality

Concentrations and Emissions

1983-2002 & 1993-2002

Criteria Pollutant

Air Quality Concentration

 Emissions

% Change
1983-2002

% Change
1993-2002

% Change
1983-2002

% Change
1993-2002


Carbon Monoxide

-65%

-42% 

-41%

-21%

Lead(e)

-94%

-57%

-93%

-5%

Nitrogen Dioxide

-21%

-11%

-15% (NOx)

-12% (NOx)

Ozone

-22% (1-hr)

-2%(a)

-40% (VOC)

-25% (VOC)

Ozone

 -14% (8-hr)

4%(a)
 

PM-10(c)

--

-13%

-34%(d)

-22%

PM-2.5(c)

--

-8(b)

--

-17%

Sulfur Dioxide

-34%

-39%

-33%

-31%


(a) Not statistically significant.
(b) Based on percentage change from 1999.
(c) Includes only directly emitted particles.
(d) Based on percentage change from 1985. Emission estimates prior to 1985 are uncertain.
(e) Lead emissions are included in the toxic air pollutant emissions inventory and are presented for 1982-2001.

Source: Latest Findings on National Air Quality: 2002 Status and Trends. U.S. Environmental Protection Agency, EPA454/K-03-001, Office of Planning and Standards, Research Triangle Park, NC 27711, September 2003.

 

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