# Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants
**AGENCY:**
Environmental Protection Agency (EPA).
**ACTION:**
Notice of extension of public comment.
**SUMMARY:**
EPA is announcing an extension of the public comment period for the first external review draft of a document titled, “First External Review Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants” (EPA/600/R-10/076A). The original *Federal Register* notice announcing the public comment period was published on February 28, 2011 (76 FR 10893). This assessment document was developed 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.
**DATES:**
The public comment period began on February 28, 2011, and ends May 5, 2011. Comments must be received by EPA by May 5, 2011.
**ADDRESSES:**
The “First External Review Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants” will be available primarily via the Web page under the Recent Additions and Publications menus at *http://www.epa.gov/ncea.* A limited number of CD-ROM or paper copies will be available. Contact Ms. Debbie Wales by phone (919-541-4731), facsimile (919-541-5078), or e-mail ( *[email protected]* ) to request either of these, and please provide your name, your mailing address, and the document title, “First External Review Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants” (EPA/600/R-10/076A) to facilitate processing of your request.
**FOR FURTHER INFORMATION CONTACT:**
For technical information, contact Dr. James Brown, NCEA; telephone: 919-541-0765; facsimile: 919-541-1818; or e-mail: *[email protected].*
Comments may be submitted electronically via *http://www.regulations.gov,* by mail, by facsimile, or by hand delivery/courier. Please follow the detailed instructions provided in the *SUPPLEMENTARY INFORMATION* section of *Federal Register* Notice (76 FR 10893).
For information on submitting comments to the docket, please contact the Office of Environmental Information Docket; telephone: 202-566-1752; facsimile: 202-566-1753; or e-mail: *[email protected].*
Dated: March 22, 2011.
Darrell A. Winner,
Acting Director, National Center for Environmental Assessment.