Approval and Promulgation of Implementation Plans; States of Illinois and Missouri; 1-Hour Ozone Attainment Demonstrations, Motor Vehicle Emissions Budgets, Reasonably Available Control Measures, Contingency Measures, Attainment Date Extension, and Withdrawal of Nonattainment Determination and Reclassification

Pursuant to the Clean Air Act (Act), EPA is approving the Illinois and Missouri 1-hour ozone attainment demonstration State Implementation Plans (SIP) for the St. Louis moderate ozone nonattainment area. In conjunction with its approval of the attainment demonstration, EPA is: extending the ozone attainment date for the St. Louis ozone nonattainment area to November 15, 2004, while retaining the area's current classification as a moderate ozone nonattainment area; withdrawing EPA's March 19, 2001, rulemaking determining nonattainment and reclassification of the St. Louis ozone nonattainment area; finding that the St. Louis ozone nonattainment area meets the reasonably available control measures (RACM) requirements of the Act; finding that the contingency measures identified by the states of Illinois and Missouri are adequate; approving the Illinois and Missouri motor vehicle emissions budgets (MVEB); and approving an exemption from the oxides of nitrogen ( NO<INF>X</INF>) emission control requirements for reasonably available control technology (RACT) and disapproving an exemption from the NO<INF>X</INF> new source review (NSR) and NO<INF>X</INF> conformity requirements for the Illinois portion of the St. Louis ozone nonattainment area.