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Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Particulate Matter in Paul Spur/Douglas, AZ

Final Determination of Attainment of the PM10 Standard for Paul Spur/Douglas, Arizona

Based on ambient monitoring data from 2009 to 2011, we finalized our determination that the Paul Spur/Douglas nonattainment area in Arizona is currently attaining the national ambient air quality standard (NAAQS) for particulate matter less than ten microns in diameter (PM10).

Final Rule


Proposed Determination of Attainment of the PM10 Standard for Paul Spur/Douglas, Arizona

Based on ambient monitoring data from 2009 to 2011, we proposed to determine that the Paul Spur/Douglas nonattainment area in Arizona is currently attaining the national ambient air quality standard (NAAQS) for particulate matter less than ten microns in diameter (PM10). We have provided for a 30-day period to receive public comment.

Proposed Rule


Particulate Matter in Paul Spur/Douglas, AZ

EPA has signed a direct final rule determining, based on quality-assured, certified ambient monitoring data, that the Paul Spur/Douglas area in Arizona attained the 1987 primary National Ambient Air Quality Standards (NAAQS) for particulate matter (PM-10) as of the applicable attainment date of December 31, 1994. The Act and our regulations require three years of quality-assured, certified ambient air quality data to make this finding. We also determine that the area has not continued to attain the standard through the present.

Related Documents

Final rule
Proposed rule

Contact Information

Wienke Tax (tax.wienke@epa.gov)
Office of Air Planning, EPA Region 9
(415) 947-4192

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