Air Plan Approval; Missouri; Infrastructure State Implementation Plan Requirements for the 2015 Ozone National Ambient Air Quality Standard

The Environmental Protection Agency (EPA) is approving elements of a State Implementation Plan (SIP) revision submission from the State of Missouri addressing the applicable requirements of section 110 of the Clean Air Act (CAA) for the 2015 Ozone (O<INF>3</INF>) National Ambient Air Quality Standard (NAAQS). Section 110 requires that each state adopt and submit a SIP revision to support the implementation, maintenance, and enforcement of each new or revised NAAQS promulgated by the EPA. These SIPs are commonly referred to as "infrastructure" SIPs. The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the state's responsibilities under the CAA. The EPA is also approving a request from the State to exempt all counties in the Metropolitan Kansas City Interstate Air Quality Control Region (Kansas City AQCR) and all of Jefferson and most of Franklin (except Boles Township) counties in the Metropolitan St. Louis Interstate (St. Louis AQCR) from needing an ozone contingency plan meeting the EPA's requirements.