El Paso: Latest Ozone Planning Activities
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. On January 15, 2009, the EPA proposed approval of the El Paso ozone maintenance SIP revision (74 FR 2387) 
. 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) , clarifying the EPA's approval of the 1997 eight-hour ozone maintenance plan.
