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EPA/AR | RIN: 2060-AO48 | Publication ID: Fall 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. A final rule was published in the Federal Register (75 FR 35520) on June 22, 2010. The final rule is effective on August 23, 2010. EPA is revising the primary SO2 NAAQS to provide requisite protection of public health with an adequate margin of safety. Specifically, EPA is establishing a new 1-hour SO2 standard at a level of 75 parts per billion based on the 3-year average of the annual 99th percentile of 1-hour daily maximum concentrations. EPA is also revoking both the existing 24-hour and annual primary SO2 standards. | |
Agency: Environmental Protection Agency(EPA) | Priority: Economically Significant |
RIN Status: Previously published in the Unified Agenda | Agenda Stage of Rulemaking: Completed Actions |
Major: Yes | Unfunded Mandates: No |
CFR Citation: 40 CFR 50 | |
Legal Authority: 42 USC 7408 42 USC 7409 |
Legal Deadline:
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Timetable:
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Additional Information: EPA publication information: NPRM - http://www.regulations.gov/search/Regs/home.html#documentDetail?R=0900006480a666ec; 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: No | |
RIN Information URL: http://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 |