Daily Rules, Proposed Rules, and Notices of the Federal Government


[FRL-9473-6; Docket ID No. EPA-HQ-ORD-2011-0050]

Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants

AGENCY: Environmental Protection Agency.
ACTION: Notice of Public Comment Period.
SUMMARY: The U.S. Environmental Protection Agency (EPA) is announcing the availability of the second external review draft of a document titled, "Second External Review Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants" (EPA/600/R-10/076B). The document was prepared by the National Center for Environmental Assessment (NCEA) within EPA's Office of Research and Development as part of the review of the national ambient air quality standards (NAAQS) for ozone.

EPA is releasing this draft document to seek review by the Clean Air Scientific Advisory Committee (CASAC) and the public (meeting date and location to be specified in a separate Federal Register notice). The draft document does not represent and should not be construed to represent any final EPA policy, viewpoint, or determination. EPA will consider any public comments submitted in response to this notice when revising the document.

DATES: Comments must be received on or before November 29, 2011.
ADDRESSES: The "Second External Review Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants" will be available primarily via the Internet on the National Center for Environmental Assessment's home page under the Recent Additions and Publications menus at limited number of CD-ROM or paper copies will be available. Contact Ms. Marieka Boyd bytelephone:919-541-0031;fax:919-541-5078; ore-mail: boyd.marieka @epa.govto request either of these. Please provide your name, your mailing address, and the document title, "Second External Review Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants" (EPA/600/R-10/076B) to facilitate processing of your request.

Comments may be submitted electronically via,by mail, by facsimile, or by hand delivery/courier. Please follow the detailed instructions provided in theSUPPLEMENTARY INFORMATIONsection of this notice.

FOR FURTHER INFORMATION CONTACT: For information on the public comment period, contact the Office of Environmental Information Docket;telephone:202-566-1752;facsimile:202-566-1756; ore-mail:

For technical information, contact Dr. James Brown, National Center for Environmental Assessment;telephone:919-541-0765;facsimile:919-541-1818; ore-mail:

SUPPLEMENTARY INFORMATION: I. Information About the Document

Section 108 (a) of the Clean Air Act directs the Administrator to identify certain pollutants which, among other things, “cause or contribute to air pollution which may reasonably be anticipated to endanger public health or welfare” and to issue air quality criteria for them. These air quality criteria are to “accurately reflect the latest scientific knowledge useful in indicating the kind and extent of all identifiable effects on public health or welfare which may be expected from the presence of [a] pollutant in the ambient air* * *.” Under section 109 of the Act, EPA is then to establish national ambient air quality standards (NAAQS) for each pollutant for which EPA has issued criteria. Section 109 (d) of the Act subsequently requires periodic review and, if appropriate, revision of existing air quality criteria to reflect advances in scientific knowledge on the effects of the pollutant on public health or welfare. EPA is also to revise the NAAQS, if appropriate, based on the revised air quality criteria.

Ozone (O3) is one of six principal (or “criteria ”) pollutants for which EPA has established NAAQS. Periodically, EPA reviews the scientific basis for these standards by preparing an Integrated Science Assessment (ISA) (formerly called an Air Quality Criteria Document). The ISA, in conjunction with additional technical and policy assessments, provides the scientific basis for EPA decisions on the adequacy of the current NAAQS and the appropriateness of possible alternative standards. The Clean Air Scientific Advisory Committee (CASAC), an independent science advisory committee whose existence and whose review and advisory functions are mandated by Section 109 (d) (2) of the Clean Air Act, is charged with the independent scientific review of EPA's air quality criteria.

On September 29, 2008 (73 FR 56581), EPA formally initiated its current review of the air quality criteria for ozone, requesting the submission of recent scientific information on specified topics. A draft of EPA's “Integrated Review Plan for the Ozone National Ambient Air Quality Standards Review” (EPA/452/P-09/001) was made available in September 2009 for public comment and was discussed by the CASAC via a publicly accessible teleconference on November 13, 2009 (74 FR 54562). In August 2010, EPA held a workshop with invited scientific experts to discuss initial draft materials prepared in the development of the ISA (75 FR 42085). The first external review draft ISA for Ozone and Related Photochemical Oxidants was released on March 4, 2011 ( The CASAC panel held a public meeting on May 19, 2011 to review the draft ISA (76 FR 23809). Subsequently, on August 10, 2011, the CASAC panel provided a consensus review to the Administrator of the EPA ($File/EPA-CASAC-11-009-unsigned.pdf).

The second external review draft “Integrated Science Assessment for Ozone and Related Photochemical Oxidants” will be discussed at a public meeting for review by the CASAC, and public comments received will be provided to the CASAC review panel. A futureFederal Registernotice will inform the public of the exact date and time of that CASAC meeting.

II. How To Submit Technical Comments to the Docket at

Submit your comments, identified by Docket ID No. EPA-HQ-ORD-2011-0050 by one of the following methods: the on-line instructions for submitting comments;



Mail:Office of Environmental Information (OEI) Docket (Mail Code: 2822T), U.S. Environmental Protection Agency, 1200 Pennsylvania Avenue, NW., Washington, DC 20460. The telephone number is 202-566-1752; or

Hand Delivery:The OEI Docket is located in the EPA Headquarters Docket Center, Room 3334 EPA West Building, 1301 Constitution Avenue, NW., Washington, DC. The EPA Docket Center Public Reading Room is open from 8:30 a.m. to 4:30 p.m., Monday through Friday, excluding legal holidays. The telephone number for the Public Reading Room is 202-566-1744. Deliveries are only accepted during the docket's normal hours of operation, and special arrangements should be made for deliveries of boxed information.

If you provide comments by mail or hand delivery, please submit three copies of the comments. For attachments, provide an index, number pages consecutively with the comments, and submit an unbound original and three copies.

Instructions:Direct your comments to Docket ID No. EPA-HQ-ORD-2011-0050. Please ensure that your comments are submitted within the specified comment period. Comments received after the closing date will be marked “late,” and may only be considered if time permits. It is EPA's policy to include all comments it receives in the public docket without change and to make the comments available online at,including any personal information provided, unless a comment includes information claimed to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Do not submit information throughhttp://www.regulations.govor e-mail that you consider to be CBI or otherwise protected. Thehttp://www.regulations.govWeb site is an “anonymous access” system, which means EPA will not know your identity or contact information unless you provide it in the body of your comment. If you send an e-mail comment directly to EPA without going through,your e-mail address will be automatically captured and included as part of the commentthat is placed in the public docket and made available on the Internet. If you submit an electronic comment, EPA recommends that you include your name and other contact information in the body of your comment and with any disk or CD-ROM you submit. If EPA cannot read your comment due to technical difficulties and cannot contact you for clarification, EPA may not be able to consider your comment. Electronic files should avoid the use of special characters, any form of encryption, and be free of any defects or viruses. For additional information about EPA's public docket visit the EPA Docket Center homepage at

Docket:Documents in the docket are listed in the index.Although listed in the index, some information is not publicly available,e.g.,CBI or other information whose disclosure is restricted by statute. Certain other materials, such as copyrighted material, are publicly available only in hard copy. Publicly available docket materials are available either electronically inhttp://www.regulations.govor in hard copy at the OEI Docket in the EPA Headquarters Docket Center.

Dated: September 20, 2011. Darrell A. Winner, Acting Director, National Center for Environmental Assessment.