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EPA/OAR RIN: 2060-AU88 Publication ID: Fall 2021 
Title: Implementation of the 2008 National Ambient Air Quality Standards for Ozone: State Implementation Plan Requirements Rule Update 

This proposed rulemaking would update the final State Implementation Plan (SIP) Requirements Rule for the 2008 Ozone National Ambient Air Quality Standards (NAAQS) (80 FR 12264, March 6, 2015) to reconcile regulatory provisions that were vacated as part of the decision in South Coast Air Quality Management District v. EPA, 882 F.3d 1138 (D.C. Cir. 2018) (South Coast II) with those listed in part 51 of the Code of Federal Regulations. The 2008 SIP Requirements Rule governs attainment planning requirements that apply to areas designated nonattainment for the 2008 ozone NAAQS, and states in the Ozone Transport Region, as well as anti-backsliding requirements for areas once designated nonattainment for the revoked ozone NAAQS. This proposed action would clarify national policy by updating affected provisions in the 2008 ozone SIP Requirements Rule to reflect the outcome of South Coast II and ensure that states understand the requirements that apply to them for continued implementation of the ozone NAAQS.

Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 51   
Legal Authority: 42 U.S.C. 7401 et seq.   
Legal Deadline:  None
Action Date FR Cite
NPRM  07/00/2022 
Final Rule  To Be Determined 
Additional Information: .
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, State 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Emily Millar
Environmental Protection Agency
Office of Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-2619
Fax:919 541-5509

Robert Lingard
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code C539-01,
Research Triangle Park, NC 27709
Phone:919 541-5272