2060-AP38 201410 The Regulatory Plan and the Unified Agenda of Federal Regulatory and Deregulatory Actions 2060 Air and Radiation AR 2000 Environmental Protection Agency EPA Review of the National Ambient Air Quality Standards for Ozone

Under the Clean Air Act, the 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 5 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 8-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 back to the EPA. The EPA initiated the current review in October 2008 with a workshop to discuss key policy-relevant issues around which EPA would structure the review. This review included 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.

]]> Economically Significant Previously Published in The Unified Agenda Proposed Rule Stage Yes No 40 CFR 50 42 USC 7408 42 USC 7409 Judicial NPRM 12/01/2014 Court-ordered Deadline Judicial Final 10/01/2015 Court-ordered Deadline Must be proposed by December 1 Yes

Under the Clean Air Act Amendments of 1977, 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 5 years.

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Review of the NAAQS is authorized by Clean Air Act Sections 108 and 109.

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The main alternative for the Administrator's decision on the review of the primary and secondary national ambient air quality standards for ozone is whether to retain or revise the existing standards.

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The Clean Air Act makes clear that the economic and technical feasibility of attaining standards are not to be considered in setting or revising the NAAQS, although such factors may be considered in the development of State plans to implement the standards. Accordingly, when the Agency proposes revisions to the standards, the Agency prepares cost and benefit information in order to provide States information that may be useful in considering different implementation strategies for meeting proposed or final standards. In those instances, cost and benefit information is generally included in the regulatory analysis accompanying the final rule.

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Health and welfare risks associated with exposure to O3 in the ambient air have been assessed. The final health and welfare Risk and Exposure Assessments for Ozone were released in August 2014, and are available at: http://www.epa.gov/ttn/naaqs/standards/ozone/data/20140829healthrea.pdf

]]> Notice 04/28/2011 76 FR 23755 NPRM 12/00/2014 Final Rule 11/00/2015 Docket #:EPA-HQ-OAR-2008-0699 No No Federal Local State Tribal No No http://www.epa.gov/ozone/ No No Susan Stone 2060 Office of Air and Radiation OAR 919 541-1146 919 541-0237 stone.susan@epa.gov C504-06, Research Triangle Park NC 27711 Karen Wesson 2060 Office of Air and Radiation OAR 919 541-3515 wesson.karen@epa.gov 109 T.W. Alexander Drive, Mail Code C504-06, Research Triangle Park NC 27711