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Upcoming Ozone Plans

8-hour ozone standard

The San Joaquin Valley air basin (Valley) is designated as an extreme ozone nonattainment area for the U.S. Environmental Protection Agency’s (EPA) 2008 8-hour ozone standard of 75 parts per billion (ppb). The plan to address this standard is expected to be due to EPA in 2016. Addressing the 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.

The District will hold a series of public workshops throughout the development of this upcoming attainment plan. To receive email notifications related to ozone plan workshops and postings, sign up for the Ozone Plans email list. The public is welcomed to provide comments throughout the development of this plan to airqualityplans@valleyair.org.

Public Workshops

The District hosted a public workshop on May 23, 2014 to present and receive comments on the development of the upcoming plan for the 2008 8-hour ozone standard. For information on this public workshop, click here.

For information on current and future public workshops, click here.

Public Advisory Workgroup

The District established a work group, the Public Advisory Workgroup (PAW), which includes members from the Citizens Advisory Committee, Environmental Justice Advisory Group, the District, and technical advisors from the Environmental Protection Agency and the California Air Resources Board. The PAW will provide for additional public engagement during the plan preparation process. For information on future PAW meetings click here. For information on past PAW meetings click here.

Additional Documents


The District is mandated by the federal Clean Air Act to prepare a demonstration that shows that reasonably available control technology requirements are being implemented for all applicable sources. On June 19, 2014, the District Governing Board adopted the Proposed 2014 Reasonably Available Control Technology Demonstration for the 8-hour Ozone State Implementation Plan and directed staff to forward the adopted 2014 RACT SIP to the ARB for approval and Submittal to the U.S. EPA. This 2014 RACT SIP fulfills federal Clean Air Act requirements and demonstrates that each applicable source category in the Valley meets or exceeds federal RACT standards. The 2014 RACT SIP is available click here.

Emissions Inventory

The federal Clean Air Act requires ozone nonattainment areas to develop an emission inventory as the basis of a State Implementation Plan (SIP) that demonstrates how they will attain the standards by specified dates. The federal Clean Air Act requires states and local governments to prepare baseline emission inventories for all areas exceeding the National Ambient Air Quality Standards within two years of designation. ARB compiled an emission inventory SIP Submittal that reflects the most up-to-date emission inventory for all areas. This 8-Hour Ozone SIP Emission Inventory Submittal is available click here.

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.

1-hour Ozone Attainment Request

For the first time in recorded history, in 2013, the Valley had zero violations of the 1-hour ozone standard established by EPA under the federal Clean Air Act. The Valley now meets the 1-hour ozone standard based on the most recent three year period air monitoring data (2011-2013).

On May 6, 2014, the District submitted a formal request that the U.S. EPA determine that the Valley has attained the federal 1-hour ozone standard. Per federal requirements, the District’s submittal includes a clean data finding and a finding that attainment is due to permanent and enforceable emissions reductions.

As part of the clean data finding, the District requested EPA concurrence that an exceedance at Fresno-Drummond on August 10, 2012 was due to an exceptional event. Alternatively, the District also provided compelling evidence that the Valley would attain the 1-hour ozone standard but for the influence of international air pollutant transport, allowing nonattainment penalties to be lifted under federal Clean Air Act section 179B.

The submittal to EPA included the following:

Adopted Ozone Plans

  • 2016 Plan for the 2008 8-Hour Ozone Standard
    The District adopted the 2016 Plan for the 2008 8-Hour Ozone Standard in June 2016. This plan satisfies Clean Air Act requirements and ensures expeditious attainment of the 75 parts per billion 8-hour ozone standard.

  • 2014 RACT SIP
    The District adopted the RACT Demonstration for Ozone SIP in June 2014.

  • 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.

Additional Documents

  • Flares Further Study
    District Rule 4311 (approved by EPA on November 3, 2011) reduces emissions from flaring activities in the San Joaquin Valley through a combination of emission limitations, monitoring, reporting, and other requirements. This study includes an assessment of the implementation of Rule 4311 and an evaluation of potential opportunities for additional requirements.