Environmental Protection Agency
Based on its review of the air quality criteria for oxides of sulfur and the primary national ambient air quality standard (NAAQS) for oxides of sulfur as measured by sulfur dioxide (SO<INF>2</INF>), EPA is revising the primary SO<INF>2</INF> NAAQS to provide requisite protection of public health with an adequate margin of safety. Specifically, EPA is establishing a new 1-hour SO<INF>2</INF> standard at a level of 75 parts per billion (ppb), based on the 3-year average of the annual 99th percentile of 1-hour daily maximum concentrations. The EPA is also revoking both the existing 24-hour and annual primary SO<INF>2</INF> standards.
Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Parts 50, 53, and 58 [EPA-HQ-OAR-2007-0352; 9160-4] RIN 2060-A048 AGENCY: Environmental Protection Agency (EPA). ACTION: Final rule. SUMMARY: Based on its review of the air quality criteria for oxides of sulfur and the primary national ambient air quality standard (NAAQS) for oxides of sulfur as measured by sulfur dioxide (SO 2 ), EPA is revising the primary SO 2 NAAQS to provide requisite protection of public health with an adequate margin of safety. Specifically, EPA is establishing a new 1-hour SO 2 standard at a level of 75 parts per billion (ppb), based on the 3-year average of the annual 99th percentile of 1-hour daily maximum concentrations. The EPA is also revoking both the existing 24-hour and annual primary SO 2 standards. DATES: This final rule is effective on August 23, 2010. ADDRESSES: EPA has established a docket for this action under Docket ID No. EPA-HQ-OAR-2007-0352. All documents in the docket are listed on the http://www.regulations.gov Web site. Although listed in the index, some information is not publicly available, e.g., confidential business information or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, will be publicly available only in hard copy form. Publicly available docket materials are available either electronically through http://www.regulations.gov or in hard copy at the Air and Radiation Docket and Information Center, EPA/DC, EPA West, R…
Other Federal Register documents from the same docket.
Denial of the Petitions To Reconsider the Final Rule Promulgating the Primary National Ambient Air Quality Standard for Sulfur Dioxide
Primary National Ambient Air Quality Standard for Sulfur Dioxide
Final Risk and Exposure Assessment Report for Sulfur Dioxide (SO2)
Second Draft Risk and Exposure Assessment Report for Sulfur Dioxide (SO2)
Second Draft Risk and Exposure Assessment Report for Sulfur Dioxide (SO2)
Citation: 75 FR 35520
