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EPA/AR RIN: 2060-AP38 Publication ID: Spring 2015 
Title: Review of the National Ambient Air Quality Standards for Ozone 

Under the Clean Air Act, the Environmental Protection Agency (EPA) is required to review and, if appropriate, revise the air quality criteria for the primary (health-based) and secondary (welfare-based) national ambient air quality standards (NAAQS) every five years. On March 23, 2008, the EPA published a final rule to revise the primary and secondary NAAQS for ozone to provide increased protection of public health and welfare. With regard to the primary standard for ozone, the EPA revised the level of the eight-hour ozone standard to 0.075 ppm. With regard to the secondary ozone standard, the EPA made it identical in all respects to the primary ozone standard, as revised. The D.C. Circuit upheld the primary standard, but remanded the secondary standard to the EPA. The EPA initiated the current review in October 2008 with a workshop to discuss key policy-relevant issues around which the EPA would structure the review. This review includes the preparation of an Integrated Science Assessment, Risk/Exposure Assessment, and a Policy Assessment Document by the EPA, with opportunities for review by EPA's Clean Air Scientific Advisory Committee and the public.

Agency: Environmental Protection Agency(EPA)  Priority: Economically Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: Yes  Unfunded Mandates: No 
CFR Citation: 40 CFR 50   
Legal Authority: 42 U.S.C. 7401 et seq. Clean Air Act   
Legal Deadline:
Action Source Description Date
NPRM  Judicial  Signature NPRM  12/01/2014 

Overall Description of Deadline: Must be proposed by December 1

Action Date FR Cite
Notice  04/28/2011  76 FR 23755   
NPRM  12/17/2014  79 FR 75233   
Final Rule  10/00/2015 
Additional Information: Docket #:EPA-HQ-OAR-2008-0699
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL:  
RIN Data Printed in the FR: No 
Agency Contact:
Susan Stone
Environmental Protection Agency
Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-1146
Fax:919 541-0237

Karen Wesson
Environmental Protection Agency
Air and Radiation
109 T.W. Alexander Drive, Mail Code C504-06,
Research Triangle Park, NC 27711
Phone:919 541-3515