Środowisko i energia · 01/11/1994

Phoenix Ozone Nonattainment Area, Clean Air Act Section 182(f) Exemption Petition

The EPA is proposing to approve a petition submitted by the Arizona Department of Environmental Quality (ADEQ) requesting that the EPA grant an exemption for the Phoenix ozone nonattainment area (Phoenix Area) from the requirement to implement oxides of nitrogen (NO X) Reasonably Available Control Technology (RACT). In accordance with the requirements of the Clean Air Act, as amended in 1990 (the Act or CAA), the Phoenix area may be exempted from the NO X reduction requirements where the Administrator determines that net air quality benefits are greater in the absence of NO X reductions from the sources concerned or that additional NO X reductions would not contribute to attainment of the national ambient air quality standard (NAAQS) for ozone. The ADEQ petition uses the Urban Airshed Model (UAM) to demonstrate that additional NO X reductions in the Phoenix Area would not contribute to attainment of the ozone NAAQS. The EPA is proposing to exempt the Phoenix Area from the requirement to implement NO X RACT and the applicable NO X general and transportation conformity requirements. The EPA is proposing approval of this action under provisions of the CAA regarding plan requirements f