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Regulation 11 Rule 18: Reduction of Risk from Air Toxic Emissions at Existing Facilities - Adopted
Learn about the Air District's development process for Regulation 11, Rule 18, which would reduce health risks from toxic emissions from existing local facilities.
Find out about the status and anticipated timeline of the rule development process. Information on hearings, workshops, and other events is provided below, along with supporting documents and materials.
August 2025: The Air District released draft amendments to Rule 11-18 for public review and comment. For more information, please visit the Rule 11-18 Amendment webpage.
December 2023 - April 2024: The Air District released draft updates to Rule 11-18 Implementation Procedures and a Concept Paper for potential changes to Rule 11-18 in December 2023. The Air District issued updated Final Implementation Procedures for Rule 11-18 on April 29, 2024. See the Facility Risk Reduction Program webpage for additional information.
November 2017: Rule 11-18 was adopted on November 14, 2017 by the Air District Board of Directors.
In November 2017, the Air District adopted Regulation 11, Rule 18: Reduction of Risk from Air Toxic Emissions at Existing Facilities (Rule 11-18) to reduce health risks from toxic emissions from existing facilities. Rule 11-18 aims to improve air quality and reduce toxic emissions from facilities ranging in size from large-scale plants like factories and oil refineries to smaller operations like back-up generators and gas stations. Rule 11-18 relies on risk screenings and health risk assessments incorporating recently adopted risk management guidelines and health risk values from the California Office of Environmental Health Hazard Assessment.
In implementing Rule 11-18, Air District staff conducts site-specific screening analyses for all facilities that report toxic air contaminant emissions, and calculates health prioritization scores based on the amount of toxic air pollution emitted, the degree of toxicity of these pollutants, and the proximity of these facilities to local communities. For facilities found to have prioritization scores above a certain value, the Air District requires health risk assessments to be conducted. Based on the health risk assessments, facilities found to have a potential health risk above the Risk Action Level would be required to reduce their risk below the Risk Action Level, or install Best Available Retrofit Control Technology for Toxics on all significant sources of toxic emissions.
Hundreds of facilities throughout the Bay Area are subject to the rule. See the Facility Risk Reduction Program webpage for additional information.
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Last Updated: 11/6/2025