CEQA Policy Development (NEW)

South Coast AQMD is in the process of developing an "Air Quality Analysis Guidance Handbook" (Handbook) to replace the CEQA Air Quality Handbook approved by the South Coast AQMD Governing Board in 1993. As part of this process, South Coast AQMD staff is updating existing and developing new air quality analysis guidance to support public agencies when they evaluate air quality impacts pursuant to the requirements of CEQA. More information about updates to and development of new air quality analysis guidance, including working group materials and presentations, can be found below. More information on the 1993 CEQA Air Quality Handbook can be obtained from Air Quality Analysis Handbook (

Cumulative Impacts from Air Toxics for CEQA Projects


CEQA requires analysis of direct, indirect, and cumulative impacts. South Coast AQMD is initiating a public process for the development of additional guidance for public agencies when they evaluate cumulative air quality impacts from increased concentrations of air toxics for projects subject to the requirements of the CEQA.


Working Group Meeting #5 - March 20, 2024

As requested by attendees of Working Group Meeting #5, these files provide the raw data and assumptions relied upon to craft Criterion #1.


Working Group Meeting #4 - June 6, 2023


Working Group Meeting #3 - January 24, 2023


Working Group Meeting #2 - May 26, 2022


Working Group Meeting #1 – February 17, 2022


Historical Information

Potential Control Strategies to Address Cumulative Impacts from Air Pollution White Paper (PDF, 2.6MB)

Appendices (PDF, 140KB)

Staff Contacts

Sam Wang
Program Supervisor
(909) 396-2649

Michael Morris
Planning and Rules Manager
(909) 396-3382

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Periodic newsletter updates via Email on a variety of air quality-related topics

South Coast Air Quality Management District

21865 Copley Dr, Diamond Bar, CA 91765



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