Provisional Assessment of Recent Studies on Health and Ecological Effects of Ozone Exposure
A provisional assessment on new ozone (O3) research was provided to EPA's Office of Air Quality Planning and Standards. This document presents the findings of EPA's survey and provisional assessment of studies relevant to assessing the health and ecological effects of O3 that were published too recently to be included in the 2006 Air Quality Criteria Document for Ozone and Related Photochemical Oxidants.
A reconsideration of the national ambient air quality standards (NAAQS) for O3 is currently underway. The last Air Quality Criteria Document for Ozone and Related Photochemical Oxidants (O3 AQCD) was released in final form in February 2006. That NAAQS review for O3 was completed with a final rule signed in March 2008. On September 16, 2009, the EPA Administrator announced a decision to reconsider the primary and secondary NAAQS for O3 based on the record from the last review. The EPA has conducted a provisional assessment of studies investigating the health and ecological effects of O3 published in recent years that were not included in the O3 AQCD. The O3 AQCD included a rigorous and thorough review of pertinent literature accepted for publication through December 2004 and a limited number of papers accepted for publication in 2005 and 2006. In the provisional assessment, EPA examined recent studies in light of the literature evaluated in the O3 AQCD. The intent of this assessment was to determine if recent studies materially change the conclusions of the O3 AQCD.
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