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1-hour Extreme Ozone Attainment Demonstration Plan

(Adopted October 2004, Amended October 2005)


  • October 8, 2004: The District adopted the Extreme 1-hour Ozone Plan
  • October 28, 2004: ARB approved the Extreme 1-hour Ozone Plan
  • November 2004: ARB forwarded the plan to EPA
  • October 20, 2005: The District adopted amendments to the Extreme 1-hour Ozone Plan (Chapters 4 and 8)
  • February 2006: ARB approved plan amendments
  • August 2008: The District adopted Clarifications for the 2004 Extreme ozone Plan
  • September 2008: ARB forwarded the Clarifications to EPA
  • October 16, 2008: EPA proposed to approve the 2004 Extreme Ozone Plan
  • March 8, 2010: EPA approved the 2004 Extreme Ozone Attainment Plan

1-hour Extreme Ozone Attainment Demonstration Plan

1-hour Extreme Ozone Attainment Demonstration Plan Appendices

Additional Documents

- Note: Previous revisions to the Draft Extreme Ozone Attainment Demonstration Plan can be reviewed here.