This rule finalizes EPA's finding of nonattainment and reclassification of the Memphis, Tennessee and Crittenden County, Arkansas 8-hour ozone nonattainment area (Memphis TN-AR Nonattainment Area). EPA finds that the Memphis TN-AR Nonattainment Area has failed to attain the 8-hour ozone national ambient air quality standard ("NAAQS" or "standard") by June 15, 2007, the attainment deadline set forth in the Clean Air Act (CAA) and Code of Federal Regulations (CFR) for marginal nonattainment areas. As a result, on the effective date of this rule, the Memphis TN-AR Nonattainment Area will be reclassified by operation of law as a moderate 8-hour ozone nonattainment area. The moderate area attainment date for the reclassified Memphis TN-AR Nonattainment Area would then be "as expeditiously as practicable," but no later than June 15, 2010. Once reclassified, Tennessee and Arkansas must submit State Implementation Plan (SIP) revisions that meet the 8-hour ozone nonattainment requirements for moderate areas, as required by the CAA. In this action, EPA is establishing the schedule for the States' submittal of the SIP revisions required for the nonattainment area once it is reclassified. EPA determines that the States must submit these SIP revisions by March 1, 2009.