Air Quality Maps of Maintenance Areas
Areas that have experienced persistent air quality problems are designated by the U.S. Environmental Protection Agency (EPA) as nonattainment areas. The federal Clean Air Act requires additional air pollution controls in these areas. Each nonattainment area is declared for a specific pollutant; however, nonattainment areas for different pollutants may overlap each other or share common boundaries.
EPA had designated 13 areas in Washington State as nonattainment. After air monitoring shows that a nonattainment area is meeting health-based air quality standards, EPA redesignated the areas as attainment. To be redesignated, an area must both meet air quality standards, and have a 10-year plan for continuing to meet and maintain air quality standards and other requirements of the Clean Air Act. Areas that are redesignated to attainment are called maintenance areas.
Here are the areas in Washington State designated as maintenance areas:
Ozone: Puget Sound (King, Pierce and Snohomish Counties) and Vancouver (Clark County) are maintenance areas.
Particulate Matter (PM10): Thurston County, Tacoma Tideflats, Kent Valley, and Seattle Duwamish, Spokane, Yakima, and Wallula (Sept 26, 2005) are maintenance areas.
Particulate Matter (PM2.5): Tacoma-Pierce County
Carbon Monoxide: Puget Sound (King, Pierce and Snohomish Counties) Yakima, Vancouver (Clark County) and Spokane are maintenance areas.
Particulate Matter Maps
Carbon Monoxide Maps
Copyright © Washington State Department of Ecology|
Privacy Notice | Site Info | Accessibility | Contact the web team |