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EPA/AR RIN: 2060-AO48 Publication ID: Spring 2010 
Title: Review of the Primary National Ambient Air Quality Standard for Sulfur Dioxide 
Abstract: Under the Clean Air Act, 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 May 22, 1996, EPA published a final decision that revisions of the primary and secondary NAAQS for Sulfur Dioxide (SO2) were not appropriate at that time, aside from several minor technical changes. That action provided the Administrator's final determination, after careful evaluation of comments received on the November 1994 proposal, that significant revisions to the primary and secondary NAAQS for SO2 would not be made at that time. In 2006, EPA's Office of Research and Development initiated the current periodic review of SO2 air quality criteria, the scientific basis for the NAAQS, with a call for information in the Federal Register. Subsequently, the decision was made to separate the reviews of the primary and secondary SO2 standards, and to combine the SO2 secondary-standard review with the secondary-standard review of Nitrogen Dioxide (NO2) due to their linkage in terms of effects and atmospheric chemistry. That joint review of the SO2 and NO2 secondary standards is part of a separate regulatory action described elsewhere in this Regulatory Plan under the identifying number (RIN) 2060-AO72. The regulatory action described here is for the Agency's review of the primary SO2 NAAQS. This review includes the preparation of an Integrated Science Assessment, Risk/Exposure Assessment, and a Policy Assessment. These documents were reviewed by EPA's Clean Air Scientific Advisory Committee and the public. These documents inform the Administrator's proposed decision as to whether to retain or revise the standards. 
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 USC 7408; 42 USC 7409 
Legal Deadline:
Action Source Description Date
NPRM  Judicial    11/16/2009 
Final  Judicial    06/02/2010 
Timetable:
Action Date FR Cite
NPRM  12/08/2009  74 FR 64810  
NPRM Comment Period End  02/08/2010   
Final Action  06/00/2010   
Additional Information: SAN No. 5163; EPA publication information: NPRM - http://www.epa.gov/ttn/naaqs/standards/so2/fr/20091208p64810.pdf; EPA Docket information: EPA-HQ-OAR-2007-0352.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: Yes 
RIN Information URL: www.epa.gov/ttn/naaqs/standards/so2/s_so2_index.html  
RIN Data Printed in the FR: No 
Agency Contact:
Michael Stewart
Environmental Protection Agency
Air and Radiation
C504-06,
Research Triangle Park, NC 27711
Phone:919 541-7524
Fax:919 541-0237
Email: stewart.michael@epa.gov

Karen Martin
Environmental Protection Agency
Air and Radiation
C504-06,
Research Triangle Park, NC 27711
Phone:919 541-5274
Fax:919 541-0237
Email: Martin.Karen@epamail.epa.gov

 
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