Air Plan Approval; Approval of Missouri Air Quality Implementation Plans; Revisions to St. Louis 2008 8-Hour Ozone Maintenance Plan

Publication Date: 
Thursday, September 30, 2021 - 4:00am

The Environmental Protection Agency (EPA) is taking final action to approve a State Implementation Plan (SIP) revision submitted by the State of Missouri on November 12, 2019, revising the maintenance plan demonstrating continued maintenance of the 2008 ozone National Ambient Air Quality Standard (NAAQS), the 1979 1-Hour and 1997 8-Hour ozone standards in the St. Louis area. This revision demonstrates that the St. Louis area no longer needs to rely on the vehicle Inspection and Maintenance (I/M) program and the use of Reformulated Gasoline (RFG) for continued maintenance throughout the maintenance period for the 2008 8-Hour ozone NAAQS, the 1979 1-Hour ozone NAAQS and 1997 8- Hour ozone NAAQS. The EPA has determined that this revision meets the requirements of the Clean Air Act (CAA).

Environmental Protection Agency