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EPA/OAR RIN: 2060-AS35 Publication ID: Spring 2020 
Title: Review of the Secondary National Ambient Air Quality Standards for Ecological Effects of Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter 
Abstract: Under the Clean Air Act, the EPA is required to review and, if appropriate, revise the air quality criteria and national ambient air quality standards (NAAQS) every 5 years. On April 3, 2012, the EPA published a final rule in which the Agency determined to retain the current secondary standards (welfare-based) for nitrogen oxides (NOx) and for sulfur oxides (SOx). On January 15, 2013, the EPA published a final rule in which the Agency retained the secondary standards for particulate matter. The current review of the air quality criteria and secondary standards for ecological effects of SOx, NOx and particulate matter includes the preparation of an Integrated Science Assessment, Risk/Exposure Assessment, and a Policy Assessment by the EPA, with opportunities for review by the EPA's Clean Air Scientific Advisory Committee and the public. These documents will inform the Administrator's proposed decision as to whether to retain or revise the standards. This proposed decision will be published in the Federal Register with opportunity provided for public comment. The Administrator's final decisions will take into consideration these documents, CASAC advice, and public comment on the proposed decision. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: Undetermined  Unfunded Mandates: No 
EO 13771 Designation: Other 
CFR Citation: 40 CFR 51   
Legal Authority: 42 U.S.C. 7401 et seq. Clean Air Act   
Legal Deadline:
Action Source Description Date
None       
Timetable:
Action Date FR Cite
Notice  08/22/2018  83 FR 42497   
NPRM  To Be Determined 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Undetermined 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Ginger Tennant
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code C504-06,
Research Triangle Park, NC 27711
Phone:919 541-4072
Fax:919 541-0237
Email: tennant.ginger@epa.gov

Karen Wesson
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code C504-06,
Research Triangle Park, NC 27711
Phone:919 541-3515
Email: wesson.karen@epa.gov