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The California Air Resources Board (CARB or Board) will conduct a public meeting at the date and time noted below to consider the adoption of the 2025 Updates to Motor Vehicle Emissions Budgets for California Ozone State Implementation Plans (2025 Ozone Budget Update), including the updated motor vehicle emissions budgets (MVEBs) for the San Diego County and San Joaquin Valley nonattainment areas. If adopted, CARB will submit the 2025 Ozone Budget Update to the U.S. Environmental Protection Agency (U.S. EPA) for inclusion in the California State Implementation Plan (SIP).
Date: March 27, 2025
Time: 10:00 a.m.
Location: California Environmental Protection Agency
California Air Resources Board | Byron Sher Auditorium
1001 I Street Sacramento, California 95814
Remote Option: Zoom
This public meeting may continue at 9:00 a.m., on March 28, 2025. Please consult the public agenda, which will be posted ten days before the March 27, 2025, Board Meeting, for important details, including the day on which this item will be considered and how the public can participate via Zoom if they choose to be remote.
Background
Section 176(c) of the federal Clean Air Act establishes transportation conformity requirements that are intended to ensure that transportation activities do not interfere with air quality progress. Transportation conformity links and coordinates transportation and air quality planning processes through motor vehicle emissions budgets (budgets) that are established in State Implementation Plans. Once budgets are established in a State Implementation Plan, subsequent transportation plans and programs produced by transportation planning agencies must demonstrate that the emissions from the plan or project do not exceed those budgets and thus “conform” to the State Implementation Plan.
For San Diego County, CARB submitted a State Implementation Plan to U.S. EPA in 2021 for the 75 and 70 parts per billion 8-hour ozone standards that included budgets developed using the California on-road mobile source emissions model, EMFAC2017. For San Joaquin Valley, CARB submitted a State Implementation Plan to U.S. EPA in 2017 for the 75 parts per billion 8-hour ozone standard that included budgets developed using the EMFAC2014 model. In 2021, California released a new version of the on-road mobile source emissions model, EMFAC2021 that is now required for transportation conformity determinations. To align the budgets with EMFAC2021, CARB is proposing to use EMFAC2021 to update the budgets for the San Diego County and San Joaquin Valley nonattainment areas. This update to the budgets will allow future conformity determinations to be made using EMFAC2021.
Further inquiries regarding this matter should be directed to Scott King, Air Pollution Specialist, South Coast Air Quality Planning Section at (279) 842-9124 or Ariel Fideldy, Manager, South Coast Air Quality Planning Section, at (279) 208-7225.
Written Comment Period & Comment Submittal
CARB staff have prepared a Staff Report, titled 2025 Updates to Motor Vehicle Emissions Budgets for California Ozone State Implementation Plans. Copies of the report may be obtained from CARB’s website. Please contact, Bradley Bechtold, Regulations Coordinator, at bradley.bechtold@arb.ca.gov or (279) 208-7266 if you need physical copies of the documents.
Interested members of the public may present comments orally or in writing during the meeting and may provide comments by postal mail or by electronic submittal before the meeting. To be considered by the Board, written comments not submitted during the meeting, must be received no later than March 17, 2025, and addressed to the following:
Clerk of the Board, California Air Resources Board
1001 I Street, Sacramento, California 95814
Please note that under the California Public Records Act (Government Code section 6250 et seq.), your written and oral comments, attachments, and associated contact information (e.g., your address, phone, email, etc.) become part of the public record and can be released to the public upon request.
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