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Upcoming Ozone Plans

8-hour ozone standard

The next plan will address EPA’s 2008 8-hour ozone standard of 75 parts per billion (ppb). This 8-hour ozone plan is expected to be due to EPA in 2015/2016. Addressing EPA’s 2008 8-hour ozone standard will pose a tremendous challenge for the Valley, given the naturally high background ozone levels and ozone transport into the Valley.

To receive email notifications related to ozone plan workshops and postings, sign up for the Ozone Plans email list.

What is ozone?

Ground level ozone impacts public health. Ozone is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC) in the presence of heat and sunlight. The Valley experiences its highest ozone levels in the summer. EPA has established ozone standards based on 1-hour averaging periods, and for 8-hour averaging periods.

More information is available on EPA’s website.

Adopted Ozone Plans

  • 2013 Plan for the Revoked 1-Hour Ozone Standard
    The District adopted the 2013 Plan for the Revoked 1-Hour Ozone Standard in September 2013.

  • 2009 RACT SIP
    The District adopted the RACT Demonstration for Ozone SIP in April 2009.

  • 2007 Ozone Plan
    The District adopted the 2007 Ozone Plan in April 2007. This plan addresses EPA’s 8-hour ozone standard of 84 parts per billion (ppb), which was established by EPA in 1997.

  • 2004 Extreme Ozone Attainment Demonstration Plan
    The District adopted this plan in October 2004 to address EPA’s 1-hour ozone standard. However, since EPA revoked this standard in 2005, EPA did not act on this plan until 2010, when a court decision required EPA action. EPA’s 2010 action approved the plan, but subsequent litigation led to a court finding that EPA had not properly considered new information available since the District adopted the plan in 2004. EPA thus withdrew its plan approval in November 2012, and the District and ARB withdrew this plan from consideration. While the 2004 plan is not a federally-approved plan, it is included here for reference.