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

Publication Date: 
Friday, July 30, 2021 - 4:00am

The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Missouri on November 12, 2019, revising the 2008 8-hour ozone maintenance plan previously approved by EPA on September 20, 2018, 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 states that the St. Louis area no longer needs to rely on the Inspection and Maintenance (I/M) program, and 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. EPA is proposing to determine that this revision meets the requirements of the Clean Air Act.

Environmental Protection Agency