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El Paso: Latest Ozone Planning Activities

Latest events and activities related to the El Paso area’s compliance with the National Ambient Air Quality Standards (NAAQS) for ground-level ozone.

El Paso County 1997 Eight-Hour Ozone Maintenance Plan SIP Revision

On April 15, 2004, the U.S. Environmental Protection Agency (EPA) designated El Paso County attainment (effective June 15, 2004) for the 1997 eight-hour ozone NAAQS of 0.08 ppm. The EPA’s Phase I Implementation Rule for the eight-hour ozone standard directed that areas designated nonattainment for the one-hour ozone standard but attainment for the eight-hour ozone standard submit a maintenance plan for the 1997 eight-hour ozone standard by June 15, 2007. The TCEQ submitted this eight-hour ozone maintenance plan to the EPA on January 20, 2006. The maintenance plan demonstrated that the area was attaining both the eight-hour and one-hour standards and would continue to attain the eight-hour standard through 2014. On January 15, 2009, the EPA proposed approval of the El Paso ozone maintenance SIP revision (74 FR 2387 Exit the TCEQ). The EPA did not receive any adverse comments regarding the maintenance plan approval, so the plan became effective on March 16, 2009. On October 20, 2010, the EPA published a final rule in the Federal Register (75 FR 64675 Exit the TCEQ), clarifying the EPA's approval of the 1997 eight-hour ozone maintenance plan.