Clean Air Act Reclassification; Arizona-Phoenix Area; Carbon Monoxide

In this document EPA is making a final finding that the Phoenix nonattainment area (Maricopa County, Arizona) has not attained the carbon monoxide (CO) national ambient air quality standards (NAAQS) by the applicable attainment date in the Clean Air Act (CAA) for moderate CO nonattainment areas, December 31, 1995. This finding is based on EPA's review of CO ambient air quality data. As a result of this finding, the Phoenix area is reclassified as a serious CO nonattainment area by operation of law. The intended effect of the reclassification is to allow the State 18 months from the effective date of this action to submit a new State Implementation Plan (SIP) demonstrating attainment of the CO NAAQS as expeditiously as practical but no later than December 31, 2000, the CAA attainment date for serious areas.