In-Use Off-Road Diesel-Fueled Fleets Regulation

The In-Use Off-Road Diesel-Fueled Fleets Regulation (Off-Road Regulation) applies to all self-propelled off-road diesel vehicles 25 horsepower or greater used in California and most two-engine vehicles (except on-road two-engine sweepers). This includes vehicles that are rented or leased (rental or leased fleets).
More about this program

CARB Approved Amendments to the Off-Road Regulation

The California Air Resources Board (CARB) approved amendments to the In-Use Off-Road Diesel-Fueled Fleets Regulation (Off-Road Regulation) on November 17, 2022, aimed at further reducing emissions from the off-road sector. For additional information regarding the approved amendments please refer to the press release.

On April 10, 2023, CARB posted a Notice of Public Availability of Modified Text and Availability of Additional Documents and Information (15-Day Notice) for the Proposed Amendments to the Off-Road Regulation. Please refer to the
15-Day Notice for more information.

Keep up to date with the latest information about the proposed amendments to the Off-Road Regulation. All regulatory documents are available on CARB's rulemaking activity page. Please see our fact sheet for an overview of the proposed amendments.

More Information

DOORS Login

Online reporting tool for off-road diesel and LSI

Off-Road Zone

Helpful resources, FAQs, and user guides

Forms & Advisories

Reporting forms, applications, and advisories

Off-Road Regulation Language

DOORS Public Info Lookup

EIN Label Vendors

Off-Road Fleet Average Calculator

Municipal Fleets in Low-Population Counties

Off-Road Engine Certification Database

Rulemaking Documents

Verified Retrofits for In-Use Off-Road Diesel Vehicles

Off-Road Fact Sheet for Executive Order N-79-20

Important Annual Reporting and Compliance Deadlines

January 1^st

Each fleet must meet the fleet average requirements or demonstrate that it met the Best Available Control Technology (BACT) requirements before January 1 of each year. For more information regarding the fleet average target and BACT requirements, please see our Fleet Average FAQ.

March 1^st

All fleets are required to complete their annual reporting requirements and submit a Responsible Official Affirmation of Reporting (ROAR) form, affirming the information reported is accurate and that the fleet is in compliance with the regulation. For more information on the annual reporting requirements, please see our ROAR and Annual Reporting FAQ.