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The California Air Resources Board (CARB) has posted new guidance documents for manufacturers, dealers, upfitters, and buyers to clarify when a heavy-duty engine must be California-certified and subject to the California Averaging, Banking and Trading program requirements (fully offset) under Title 13, California Code of Regulations, Sections 1956.8(b) and 2015(r). These guidance documents provide additional information to assist stakeholders in planning efforts to comply with the Heavy-Duty Engine and Vehicle Omnibus (Omnibus) regulation:
- Clarifications for California Truck Dealers Regarding Sales Outside California
- CARB Responses Regarding Requests for Enforcement Discretion for Advanced Clean Fleets and Omnibus Regulations
While these documents are intended to help with compliance efforts, it is the sole responsibility of each regulated entity to ensure compliance with the Omnibus regulation.
In July 2023, CARB announced a Clean Truck Partnership with the nation’s leading truck manufacturers and the Truck and Engine Manufacturers Association. CARB has created a website to track the status and outcome of commitments made as part of that partnership: Clean Truck Partnership Commitments.
In August 2023, CARB staff proposed amendments to the Omnibus regulation to provide additional compliance flexibilities in the 2024 through 2026 model year timeframe, while maintaining the emissions benefits of the Omnibus regulation. CARB’s Executive Officer signed Executive Order R-23-006 of the Omnibus Amendments Regulation, approving the proposed amendments, on December 28, 2023.
Background
In September 2021, CARB adopted the Omnibus regulation, which primarily established more stringent exhaust emission standards for oxides of nitrogen (NOx) for 2024 and subsequent model heavy-duty engines that are more stringent than currently applicable California and federal exhaust emission standards. Additionally, the Omnibus regulation significantly strengthens other elements of California’s certification and testing programs to ensure heavy-duty engines comply with the more stringent standards throughout their useful lives.
The Omnibus regulation also provides manufacturers the flexibility to distribute limited quantities of 2024 and 2025 model year heavy-duty legacy engines (meeting the 2023 model year requirements) in California, provided that manufacturers offset any resulting legacy engine emissions deficits with heavy-duty zero-emission powertrain credits, heavy-duty combustion credits, or performing projects in disadvantaged communities.
On October 20, 2023, the Executive Officer of CARB conducted a public hearing under the authority granted by the Board in Resolution 23-15 to consider the proposed amendments to the Omnibus regulation. The proposed amendments provide additional compliance flexibilities to manufacturers in the 2024 through 2026 model year timeframe, while maintaining the emissions benefits of the Omnibus regulation.
Contact
If you have questions, please email lownox@arb.ca.gov.
For more information, visit the Heavy-Duty Low NOx webpage. All regulatory documents for the 2020 and 2023 Amendments Rulemakings are available on the CARB Rulemaking Activity pages.
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