Approval of Missouri's Air Quality Implementation Plans; Early Progress Plan of the St. Louis Nonattainment Area for the 2008 Ozone National Ambient Air Quality Standard

The Environmental Protection Agency (EPA) is taking direct final action to approve revisions to the State Implementation Plan (SIP) submitted by the State of Missouri consisting of the Early Progress Plan and motor vehicle emissions budgets (MVEBs) for volatile organic compounds (VOCs) and oxides of nitrogen (NOX) for the St. Louis Nonattainment area under the 2008 8-hour National Ambient Air Quality Standard (NAAQS). On August 26, 2013, EPA received from the Missouri Department of Natural Resources (MDNR) an Early Progress Plan for the St. Louis area showing progress toward attainment under the 2008 Ozone NAAQS. This submittal was developed to establish MVEBs for the St. Louis 8-hour ozone nonattainment area. This approval of the Early Progress Plan for the St. Louis 8-hour ozone nonattainment area fulfills EPA's requirement to act on the MDNR SIP submission and to formalize that the MVEB is approved, and when considered with the emissions from all sources, demonstrates progress toward attainment from the 2008 base year through a 2015 target year. EPA found these MVEBs adequate for transportation conformity purposes in an earlier action on March 5, 2014.