§ 52.2308 Area-wide nitrogen oxides (NOX) exemptions.

(a) The Texas Natural Resource Conservation Commission (TNRCC) submitted to the EPA on June 17, 1994, a petition requesting that the Dallas ozone nonattainment area be exempted from the NO_X control requirements of section 182(f) of the Clean Air Act (CAA) as amended in 1990. The Dallas nonattainment area consists of Dallas, Tarrant, Denton, and Collin counties. The exemption request was based on a photochemical grid modeling which shows that the Dallas nonattainment area would attain the National Ambient Air Quality Standards (NAAQS) for ozone by the CAA mandated deadline without the implementation of the additional NO_X controls required under section 182(f). On November 21, 1994, the EPA conditionally approved this exemption request, conditioned upon the EPA approving the modeling portion of the Dallas attainment demonstration SIP.

(b) The TNRCC submitted to the EPA on June 17, 1994, a petition requesting that the El Paso ozone nonattainment area be exempted from the NO_X control requirements of section 182(f) of the Clean Air Act (CAA) as amended in 1990. The El Paso nonattainment area consists of El Paso county, and shares a common airshed with Juarez, Mexico. The exemption request was based on a photochemical grid modeling which shows that the El Paso nonattainment area would attain the NAAQS for ozone by the CAA mandated deadline without the implementation of the additional NO_X controls required under section 182(f), but for emissions emanating from Mexico. On November 21, 1994, the EPA conditionally approved this exemption request, conditioned upon the EPA approving the modeling portion of the El Paso attainment demonstration SIP.