2021-15730: Air Plan Approval; Approval of Missouri Air Quality Implementation Plans; Revisions to St. Louis 1997 PM2.5 Maintenance Plan
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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 maintenance plan demonstrating continued maintenance of the 1997 PM<INF>2.5</INF> National Ambient Air Quality Standards (NAAQS) in the St. Louis area. This revision states 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 1997 PM<INF>2.5</INF> NAAQS. EPA is proposing to determine that this revision meets the requirements of the Clean Air Act.
The agency’s own summary, as published.
What this changes
Amends 1 part of the Code of Federal Regulations — the standing rules this notice rewrites.
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