Designation of Areas for Air Quality Planning Purposes; State of California; Correction of Design Value for San Diego Ozone Nonattainment Area; Reclassification of San Diego Ozone Nonattainment Area to Serious

This document announces the EPA Region IX decision to reclassify the San Diego, California, ozone nonattainment area (San Diego) from severe to serious. San Diego was classified as a severe ozone nonattainment area by EPA on November 6, 1991 (56 FR 56694). However, EPA has determined that the ozone design value of .190 ppm published by EPA and used in classifying San Diego as a severe ozone nonattainment area was incorrect. The correct monitored ozone design value was .185 ppm. This design value falls within the range of values which would have provided the opportunity for the State to request reclassification of San Diego under section 181(a)(4) of the Clean Air Act, as amended in 1990 (CAA or the Act). Pursuant to section 110(k) of the Act, which allows EPA to correct its actions, EPA is today publishing the correct design value of .185 ppm and is granting the State's request to reclassify the San Diego nonattainment area under section 181(a)(4).