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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