Carbon monoxide emissions

■ Fuel combustion □ Transportation □ Industrial processes □ Fires

200,000 180,000 160,000 140,000 120,000 100,000 80,000 60,000 40,000 20,000 0

In 1985, the Environmental Protection Agency refined 'Its methods for estimating emissions

Fire emissions not available for 2002

In 1985, the Environmental Protection Agency refined 'Its methods for estimating emissions

Fire emissions not available for 2002

83 85

1983-02: 41% decrease 1993-02: 21% decrease source: Adapted from "CO Emissions, 1983-2002," in Latest Findings on National Air Quality: 2002 Status and Trends, U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Washington, DC, August 2003

ing data from 205 sites around the country. Over this time period CO concentrations decreased by 65%. In 2002 the average measured CO concentration at the monitoring sites was just under three parts per million (three parts CO per million parts of air).

Despite these improvements there are still areas of the country with air quality concentrations of CO that are "persistently" above the NAAQS. These nonattainment

Carbon monoxide air quality concentrations, 1983-2002

[Based on annual second maximum 8-hour average]

Carbon monoxide air quality concentrations, 1983-2002

[Based on annual second maximum 8-hour average]

1983-02: 65% decrease 1993-02: 42% decrease

*National Ambient Air Quality Standards source: "CO Air Quality, 1983-2002," in Latest Findings on National Air Quality: 2002 Status and Trends, U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Washington, DC, August 2003

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