Approval and Promulgation of Air Quality Implementation Plans; Louisiana; Approval of Section 110(a)(1) Maintenance Plans for the 1997 8-Hour Ozone Standard for the Parishes of Calcasieu and St. James

EPA is approving revisions to the Louisiana State Implementation Plan (SIP) concerning maintenance plans addressing the 1997 8-hour ozone standard for the parishes of Calcasieu and St. James. On July 20, 2007, and August 24, 2007, the State of Louisiana submitted separate SIP revisions containing maintenance plans for the 1997 ozone standard for Calcasieu and St. James Parishes, respectively. These plans ensure the continued attainment of the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS) through the year 2014. On March 12, 2008, EPA issued a revised ozone standard. Today's action, however, is being taken to address requirements under the 1997 ozone standard. Requirements for these areas under the 2008 standard will be addressed in future actions. These maintenance plans meet the statutory and regulatory requirements, and are consistent with EPA's guidance. EPA is approving the revisions pursuant to section 110 of the Federal Clean Air Act (CAA).