Integrated Science Assessment of Ozone and Related Photochemical Oxidants (First External Review Draft)
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EPA released the First External Review Draft of the Integrated Science Assessment for Ozone and Related Photochemical Oxidants for peer review and public comment. Ozone (O3) is one of six principal (or criteria) pollutants for which EPA has established national ambient air quality standards (NAAQS). The Clean Air Act requires EPA to periodically review the scientific basis for these standards by preparing an Integrated Science Assessment (ISA), formerly called an Air Quality Criteria Document (AQCD). These reviews play a significant role in EPA’s commitment to ensuring a clean and healthy environment for the public. The first draft ISA is part of the Agency’s periodic review of the primary and secondary NAAQS for O3. New material has been included in this draft, but many of the overall conclusions remain generally the same as the last NAAQS review which was completed in 2008. For example, in relation to short-term exposures, new evidence for O3-induced health effects strengthens the body of evidence for associations with premature mortality and respiratory morbidity. Also, the current ambient O3 concentrations in many areas of the US are sufficient to impair growth of numerous plant species. Within an ecosystem, O3 can alter timber production, water availability in watersheds and carbon sequestration; and, it can affect ecosystem biodiversity. In addition, as was concluded in the last NAAQS review, O3 can affect the climate by acting as a climate-forcing greenhouse gas. In contrast to the last review, there is now evidence suggesting that premature mortality and respiratory morbidity are associated with O3 long-term exposure.
|Feb 2006||EPA released the final report of the Air Quality Criteria Document for Ozone (EPA/600/R-05/004). [Federal Register Feb 28, 2006]|
|Sep 2008||EPA announced notice of workshop and call for Information on Integrated Science Assessment. [Federal Register Sep 29, 2008]|
|Sep 2009||EPA released an Integrated Review Plan for the Ozone National Ambient Air Quality Standards (PDF, 78pp, 486Kb) (EPA 452/D-09-001).|
|Jul 2010||EPA announced an Aug 2010 public workshop to evaluate initial draft materials for the health effects sections of the upcoming Ozone Integrated Science Assessment. [Federal Register Jul 20, 2010]|
|Feb 2011||EPA's Science Advisory Board's CASAC announces a meeting of the Ozone Review Panel for the Reconsideration of the 2008 National Ambient Air Quality Standard. [Federal Register Feb 28, 2011]|
|Feb 2011||EPA released the first external review draft for public review and comments. [Federal Register Feb 28, 2011]|
|Mar 2011||EPA announced an extension of the public comment period for the draft document , First External Review Draft Integrated Science Assessment for Ozone and Related Photochemical Oxidants. [Federal Register Mar 28, 2011]|
|Jun 2011||EPA's Science Advisory Board's CASAC announces a meeting of the Ozone Review Panel for the review of the EPA's Integrated Science Assessment for Ozone and Related Photochemical Oxidants (March 2011 Draft). [Federal Register Jun 3, 2011]|
This download(s) is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by EPA. It does not represent and should not be construed to represent any Agency determination or policy.