Air Plan Approval; Approval of Missouri Air Quality Implementation Plans; Revisions to St. Louis 1997 PM2.5 Maintenance Plan
air-emissions · Rule · Published 2021-09-30 · Effective 2021-11-01 · MO · 86 FR 54106
Document
Document number
2021-20972
Federal Register citation
86 FR 54106
CFR reference
40 CFR 52
Type
Rule
Action
Final rule.
Category
air-emissions
Publication date
2021-09-30
Effective date
2021-11-01
State
MO
EPA docket
EPA-R07-OAR-2021-0405
Abstract
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 1997 PM<INF>2.5</INF> National Ambient Air Quality Standards (NAAQS) 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 1997 PM<INF>2.5</INF> NAAQS. The EPA has determined that this revision meets the requirements of the Clean Air Act (CAA).