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CASAC Ozone Review Panel Teleconference Meeting, March 5, 2007 Final: 04/17/2007 susceptible populations, including elderly with preexisting medical conditions. Another member commented that the Agency needs to significantly-strengthen its overall ozone research efforts. • The tables in the Final Ozone Staff Paper do not emphasize the adverse human health effects, including the impact on lung development, associated with various levels and multiple occurrences of ozone exposure. Summary of the CASAC Discussion on the Secondar~3 NAAOS found in Chapter 8 of the Final Ozone Staff Parser With respect to the discussion of the secondary Ozone NAAQS in the Final Ozone Staff Paper, Ozone Panel members included the following conclusions and other key points: • The CASAC was unanimous in its support for the recommendation in the Final Ozone Staff Paper that the protection of both crops and ecosystems requires a secondary Ozone NAAQS that is substantially different from the primary ozone standard in averaging time, level and form. • Ozone is a regional -rather than simply alocal -pollutant. Panelists also reiterated that adverse environmental effects result from a mixture of photochemical oxidants and not merely ozone.' • The Ozone Panel would prefer the sigmoidally-weighted W 126 index rather than the SUM06 metric, and that the version of W 126 to be used should be equivalent to a SUM06 level of 10-20 ppm-hours. In addition, the Ozone Panel members discussed the summer "growing season." Summary and Next Steps Dr. Henderson reiterated that the CASAC's letter to the EPA Administrator on this subject would not change the Final Ozone Staff Paper but was intended to inform the Agency's thinking as it prepared to issue the notice of proposed rulemaking for ozone. The Chair requested that Ozone Panel members send any inputs into the draft CASAC letter to the Administrator to her as soon as possible, and also asked that Panelists send any initial or updated individual review comments on the Final Ozone Staff Paper both to Dr. Henderson and to Mr. Butterfield no later than March 12. The Chair thanked everyone on the call for their participation. The DFO adjourned the meeting at approximately 4:00 p.m. on March 5, 2007. U date: The CASAC's final letter/report (EPA-CASAC-07-002, dated March 26, 2007) from the CASAC Ozone Review Panel's March 5, 2007 teleconference meeting was transmitted to the Administrator on March 27, 2007, and was posted the next day on the SAB Web site at the following URL: htto://www.epa.eov/sab/pdf/casac-07-002:pdf.]