Ozone (O₃) Standards

Announcements

August 27, 2012 - EPA announces an extension of the public comment period for the first draft Risk and Exposure Assessments and the first draft Policy Assessment. The extended public comment period will close on October 12, 2012.
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August 16, 2012 - EPA provides first draft Policy Assessment and updates to the first draft Risk and Exposure Assessments for Health and Welfare, along with several technical memos and appendices. The updates to the Health and Welfare REAs include additional information not provided in the July 16th release. Updates to the Health REA include Chapter 6 which describes risk analyses based on application of results from human clinical studies, an updated Chapter 9 which incorporates the findings from Chapter 6, and several corrections to other chapters, including corrected table numbers in Chapter 5, and corrected references in several locations. Updates to the Welfare REA include additional analyses described in Chapter 6 (Ecosystem Services) which provide estimates of damages from ozone exposure to ecosystem services related to commercial forests and urban trees, additional discussions in Chapter 7 related to the ecosystem service analyses in the revised Chapter 6, as well as corrections to maps in Chapter 4 (Air Quality Considerations) and corrected references in several locations.