Final Contingency Measures Guidance
On December 3, 2024, EPA released the “Final Guidance on the Preparation of State Implementation Plan Provisions that Address the Nonattainment Area Contingency Measure Requirements for Ozone and Particulate Matter.” The purpose of this guidance is to assist air agencies that are required to prepare nonattainment area plan submissions under Part D of Title I of the Clean Air Act (CAA). Specifically, in this document, the Environmental Protection Agency (EPA) provides nationally applicable guidance to air agencies for the preparation of ozone and particulate matter plans and focuses on the requirement for those plans to include contingency measures (CMs). CMs are emissions control requirements that would take effect upon future events, such as if an area fails to attain a National Ambient Air Quality Standard (NAAQS) by an applicable attainment date, or fails to make reasonable further progress toward attainment.
EPA released a draft of this guidance document on March 17, 2023.