Second Draft Document Related to the Review of the National Ambient Air Quality Standards for Particulate Matter

AGENCY:

Environmental Protection Agency (EPA).

ACTION:

Notice of Extension of Comment Period.

SUMMARY:

The EPA is announcing an extension of the public comment period for one chapter of the draft assessment document titled, Policy Assessment for the Review of the Particulate Matter National Ambient Air Quality Standards—Second External Review Draft. The EPA is extending the comment period for chapter 4—Review of the Secondary Standards for Visibility-Related Effects. This chapter is based on the Particulate Matter Urban-Focused Visibility Assessment (UFVA) which was finalized later than originally anticipated. As a result, the Agency is extending the comment period by two weeks to provide stakeholders and the public with adequate time to conduct appropriate analysis and prepare meaningful comments on chapter 4 of the second draft Policy Assessment. The original comment period was to end on August 16, 2010. The extended comment period for chapter 4 will now close on August 30, 2010.

DATES:

Comments should be submitted on or before August 30, 2010.

ADDRESSES:

Submit your comments, identified by Docket ID No. EPA-HQ-OAR-2007-0492, by one of the following methods:

• http://www.regulations.gov: Follow the on-line instructions for submitting comments.
• E-mail: Comments may be sent by electronic mail (e-mail) to a-and-r-docket@epa.gov, Attention Docket ID No. EPA-HQ-OAR-2007-0492.
• Fax: Fax your comments to 202-566-9744, Attention Docket ID No. EPA-HQ-OAR-2007-0492.
• Mail: Send your comments to: Air and Radiation Docket and Information Center, Environmental Protection Agency, Mailcode: 2822T, 1200 Pennsylvania Ave., NW., Washington, DC 20460, Attention Docket ID No. EPA-HQ-OAR-2007-0492.
• Hand Delivery or Courier: Deliver your comments to: EPA Docket Center, 1301 Constitution Ave., NW., Room 3334, Washington, DC. Such deliveries are only accepted during the Docket's normal hours of operation, and special arrangements should be made for deliveries of boxed information.

Instructions: Direct your comments to Docket ID No. EPA-HQ-OAR-2007-0492. The EPA's policy is that all comments received will be included in the public docket without change and may be made available online at http://www.regulations.gov,, including any personal information provided, unless the comment includes information claimed to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Do not submit information that you consider to be CBI or otherwise protected through http://www.regulations.gov or e-mail. The http://www.regulations.gov Web 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 http://www.regulations.gov,, your e-mail address will be automatically captured and included as part of the comment that 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.

Docket: All documents in the docket are listed in the http://www.regulations.gov 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 material, such as copyrighted material, will be publicly available only in hard copy. Publicly available docket materials are available either electronically in http://www.regulations.gov or in hard copy at the Air Docket in the EPA Docket Center, EPA West, Room 3334, 1301 Constitution Ave., NW., Washington, DC. This Docket Facility is open from 8:30 a.m. to 4:30 p.m. Monday through Friday, excluding legal holidays. The Docket telephone number is 202-566-1742; fax 202-566-9744.

FOR FURTHER INFORMATION CONTACT:

For questions related to this draft document, please contact Ms. Beth Hassett-Sipple, Office of Air Quality Planning and Standards (Mail code C504-06), U.S. Environmental Protection Agency, Research Triangle Park, NC 27711; e-mail: hassett-sipple.beth@epa.gov; telephone: 919-541-4605; fax: 919-541-0237.

General Information

A. What should I consider as I prepare my comments for EPA?

1. Submitting CBI. Do not submit this information to EPA through http://www.regulations.gov or e-mail. Clearly mark the part or all of the information that you claim to be CBI. For CBI information in a disk or CD ROM that you mail to EPA, mark the outside of the disk or CD ROM as CBI and then identify electronically within the disk or CD ROM the specific information that is claimed as CBI. In addition to one complete version of the comment that includes information claimed as CBI, a copy of the comment that does not contain the information claimed as CBI must be submitted for inclusion in the public docket. Information so marked will not be disclosed except in accordance with procedures set forth in 40 CFR part 2.

2. Tips for Preparing Your Comments. When submitting comments, remember to:

• Identify the rulemaking by docket number and other identifying information (subject heading, Federal Register date and page number).
• Follow directions—The agency may ask you to respond to specific questions or organize comments by referencing a Code of Federal Regulations (CFR) part or section number.
• Explain why you agree or disagree; suggest alternatives and substitute language for your requested changes.
• Describe any assumptions and provide any technical information and/or data that you used.
• If you estimate potential costs or burdens, explain how you arrived at your estimate in sufficient detail to allow for it to be reproduced.
• Provide specific examples to illustrate your concerns, and suggest alternatives.
• Make sure to submit your comments by the comment period deadline identified.

SUPPLEMENTARY INFORMATION:

Under section 108(a) of the Clean Air Act (CAA), the Administrator identifies and lists certain pollutants which “cause or contribute to air pollution which may reasonably be anticipated to endanger public health or welfare.” The EPA then issues air quality criteria for these listed pollutants, which are commonly referred to as “criteria pollutants.” The 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, in varying quantities.” Under section 109 of the CAA, EPA establishes primary (health-based) and secondary (welfare-based) national ambient air quality standards (NAAQS) for pollutants for which air quality criteria are issued. Section 109(d) of the CAA requires periodic review and, if appropriate, revision of existing air quality criteria. The revised air quality criteria reflect advances in scientific knowledge on the effects of the pollutant on public health or welfare. The EPA is also required to periodically review and revise the NAAQS, if appropriate, based on the revised criteria.

As part of EPA's review of the primary (health-based) and secondary (welfare-based) PM NAAQS, the Agency recently released the Policy Assessment for the Review of the Particulate Matter National Ambient Air Quality Standards—Second External Review Draft (Policy Assessment; 75 FR 39253; July 8, 2010). The second draft Policy Assessment builds on the scientific and technical information available in this review as assessed in the Integrated Science Assessment for Particulate Matter and two quantitative assessment documents, Particulate Matter Urban-Focused Visibility Assessment (UFVA) and Quantitative Health Risk Assessment for Particulate Matter.

The UFVA was scheduled to be finalized on or about June 30, 2010 (75 FR 39252, July 8, 2010). However, in finalizing this document, EPA staff identified a data processing error which caused organic carbonaceous material to be over estimated on some days. The corrections were quite small and did not affect the conclusions. Corrections have been made to the final UFVA. Since the UFVA was finalized later than originally anticipated and chapter 4 of the second draft Policy Assessment (Review of the Secondary Standards for Visibility-Related Effects) builds on the information presented in the UFVA, EPA is extending the comment period by two weeks for this chapter to provide stakeholders and the public with adequate time to conduct appropriate analysis and prepare meaningful comments. The second draft Policy Assessment may be accessed online through EPA's TTN website at: http://www.epa.gov/ttn/naaqs/standards/pm/s_pm_2007_pa.html.

The draft document described above does not represent and should not be construed to represent any final EPA policy, viewpoint, or determination.