Approval and Promulgation of Implementation Plans; State of Missouri

EPA is approving a request to amend the Missouri State Implementation Plan (SIP) to include the base year inventory for the Missouri portion of the St. Louis 8-hour ozone national ambient air quality standard (NAAQS) nonattainment area and a demonstration of Missouri's emissions statement authority. The Missouri portion of the St. Louis nonattainment area consists of the City of St. Louis and Franklin, Jefferson, St. Charles and St. Louis Counties. The nonattainment area also includes four counties in Illinois. This amendment would fulfill Missouri's obligation, as a moderate nonattainment area, to submit a base year inventory for the 8-hour ozone NAAQS and to demonstrate adequate authority to address the emissions statement requirement as required under Section 182(a)(1) and Section 182(a)(3)(B) of the Clean Air Act, respectively.