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JN~tEO STgTFs A >~ UNITED STATES ENVIRONMENTAL PROTECTION AGENCY i ~~+Q = WASHINGTON D.C. 20460 ;~~~'OC PRO\E'~Oi OFFICE OF THE ADMINISTRATOR SCIENCE ADVISORY BOARD March 26, 2007 EPA-CASAC-07-002 Honorable Stephen L. Johnson Administrator U.S. Environmental Protection Agency 1200 Pennsylvania Avenue, NW Washington, DC 20460 Subject: Clean Air Scientific Advisory Committee's (CASAC) Review of the Agency's Final Ozone Staff Paper Dear Administrator Johnson: The Clean Air Scientific Advisory Committee (CASAC or Committee), augmented by subject-matter-expert Panelists -collectively referred to as the CASAC Ozone Review Panel (Ozone Panel) -completed its review of the Agency's 2nd Draft Ozone Staff Paper in October 2006 (EPA-CASAC-07-001). In that letter, dated October 24, 2006, the CASAC indicated it would review the Agency's Final Ozone Staff Paper and offer additional, unsolicited advice to the Agency on the chapters concerned with setting the primary and secondary National Ambient Air Quality Standazds (NAAQS) for ozone. On Mazch 5, 2007, the Ozone Panel met via a public teleconference to review EPA's Final Review of the National Ambient Air Quality Standards for Ozone.• Policy Assessment of Scientific and Technical Information (Final Ozone Staff Paper, January 2007). The Panel focused on Chapter 6 (The Primary 03 NAAQS) and Chapter 8 (The Secondary 03 NAAQS). The CASAC roster is attached as found in Appendix A, the Ozone Panel roster is provided as Appendix B, and Ozone Panel members' individual review comments aze found in Appendix C. Members of the CASAC Ozone Review Panel were pleased to review EPA's Final Ozone Staff Paper. The members of CASAC and the Ozone Panel were unanimous in their praise of both the responsiveness of the Agency to our previous recommendations and of the clarity of this document. While the CASAC recognizes that the Ozone Staff Paper is a final document, the Committee offers the following advice to aid the Administrator and Agency staff in developing EPA's proposed rule for ozone and related photochemical oxidants, to be published in June 2007. G.