The South Coast Air Basin is classified as an "extreme" nonattainment area for the 1997 8-hour ozone NAAQS, with an attainment date of June 15, 2024. As required by the federal Clean Air Act, South Coast AQMD adopted a Contingency Measure Plan for the 1997 ozone standard on December 6, 2019 and subsequently submitted to U.S. EPA. On February 2, 2024, U.S. EPA proposed disapproval of that plan. U.S. EPA is accepting comments on their proposed action through April 3, 2023 (link).

**NEW** South Coast AQMD's Comment Letter to U.S. EPA (dated March 27, 2024)

Related Resources

• Fact Sheet - Overview of U.S. EPA's Proposed Disapproval

• Slide Deck - Update on U.S. EPA’s Proposed Action on South Coast AQMD’s Plan to Meet the 1997 Ozone Standard (updated April 10, 2024)

• Final 2016 AQMP and Related SIP Submittals

• Final Contingency Measure Plan for 1997 Ozone Standard

• Lawsuit Against U.S. EPA for Failing to Take Action on a 2019 State Implementation Plan Submission in a Timely Manner (Filed April 7, 2023)

• Notice of Intent to Sue the U.S. EPA for Failing to Take Action on a 2019 State Implementation Plan Submission in a Timely Manner (dated April 15, 2022)