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USA: Proposed Amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus, Low Carbon Fuel Standard Regulations, and to Permanently Adopt the Emergency Vehicle Emissions Regulations

Updated on : 07-10-2025

USA: Proposed Amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus, Low Carbon Fuel Standard Regulations, and to Permanently Adopt the Emergency Vehicle Emissions Regulations

The proposal for the On-Road Heavy-Duty Engine and Vehicle Omnibus regulation (called “Omnibus” because it contains many elements) was presented at the August 2020 Board Hearing of the California Air Resources Board (CARB or Board). Given that the trucking sector was the largest contributor to smog forming oxides of nitrogen (NOx) emissions in California, the proposal included a comprehensive set of requirements to reduce emissions from heavy-duty (HD) trucks. These requirements included many elements such as more stringent NOx and particulate matter (PM) emission standards, enhanced in-use testing procedures, a new certification test cycle representative of stop and go operations in heavy traffic conditions, longer useful life (UL) periods that better represent real life trucking operations, and longer warranty periods that would ensure more reliable trucks operating on California roadways. The Omnibus regulation established a significant set of requirements designed to ensure that NOx emissions from heavy-duty engines (HDE) are significantly reduced from the time the vehicle/engine is first sold until the end of its UL.

The Omnibus regulation was designed to implement stringency in three separate steps. The first set of emission standards and requirements were designed to go into effect in model year (MY) 2024. The second set of requirements would become effective in 2027 MY, and the final step of the regulation would be implemented in 2031 MY. With each step of the program, the stringency of the emission standards and other requirements would increase.CARB is proposing these Omnibus amendments, LCFS amendments, and permanent adoption of its Emergency Vehicle Emissions Regulations together as one rulemaking for administrative efficiency, but the Omnibus and Associated Amendments, LCFS Amendments, and Emergency Vehicle Emissions Regulations are three separate regulatory items proposed for approval. CARB will conduct a public hearing at the date and time noted below to consider approving proposed amendments to the On–Road Heavy–Duty Engine and Vehicle Omnibus Regulation, the Low Carbon Fuel Standard (LCFS), and to propose permanently adopting the Emergency Vehicle Emissions Regula­tions that CARB previously noticed as an emergency rulemaking on 15 September 2025. Date: 20 November 2025 

Time: 9:00 a.m.Pacific TimeIn–Person Location: 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.Pacific Time) on 21 November 2025. Please consult the public agenda, which will be posted ten days before the 20 November 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.The public comment period for this regulatory action will begin on 26 September 2025. Written comments not submitted during the hearing must be submitted on or after 26 September 2025, and received no later than 10 November 2025.  Comment form at https://carb.commentinput.com/?id=6947kUZ3F

Download: USA: Proposed Amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus, Low Carbon Fuel Standard Regulations, and to Permanently Adopt the Emergency Vehicle Emissions Regulations

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