Public CommentProposedProposed RegulationPublic Comment
Third 15-Day Notice for Heavy-Duty Omnibus and Emergency Vehicle Emissions Rulemaking
California Air Resources BoardCalifornia Air Resources BoardCalifornia
Announced
Jul 21, 2026
Description
CARB posted the Third Notice of Public Availability of Modified Text for proposed amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus regulations, Low Carbon Fuel Standard regulations, and permanent adoption of Emergency Vehicle Emissions Regulations. The comment deadline for the Third 15-Day Changes is August 5, 2026. This rulemaking proceeding addresses amendments to multiple CARB mobile source and fuel programs. Previous 15-day notices were posted April 3, 2026 (first) and June 30, 2026 (second).
Sources
Key Findings
Third 15-Day Notice for Heavy-Duty Omnibus and Emergency Vehicle Emissions Rulemaking
State of California Air Resources Board Third Notice of Public Availability of Modified Text Proposed Amendments to the Permanent Adoption of the Emergency Vehicle Emissions Regulations Public Hearing Date: March 26, 2026 Public Availability Date for First 15-Day Changes: April 3, 2026 Public Availability Date for Second 15-Day Changes: June 30, 2026 Public Availability Date for Third 15-Day Changes: July 21, 2026 De
Third 15-Day Notice for Heavy-Duty Omnibus and Emergency Vehicle Emissions Rulemaking
reached. Adopted Regulations and Materials Submitted to OAL This stage has not yet been reached. Hearing Action and Supplemental 15 Day Notices ###### Posted [Third Notice of Public Availability of Modified Text](https://ww2.arb.ca.gov/sites/default/files/barcu/regact/2025/orhdlcfs/3rd15d_notice.pdf) **(Deadline to Comment: August 5, 2026)** [Appendix A-9.1](https://ww2.arb.ca.gov/sites/default/files/barcu/regact/20