California Air Resources Board Granted Authorization by US EPA to Enforce All Provisions of the Off-Road Diesel Vehicle Regulation

On Friday, September 13, 2013 the US EPA granted the California Air Resources Board (CARB) authorization to enforce all provisions of the In-Use Off-Road Diesel Vehicle Regulation (Off-Road Regulation). Up to this point, CARB has been enforcing the reporting, labeling, sales disclosure and idle limitation requirements, and will continue to do so. With EPA authorization, CARB will begin January 1, 2014 to enforce the prohibitions of adding certain tier vehicles to a fleet. Beginning January 1, 2014, all fleets will be prohibited from adding Tier 0 powered vehicles, and Large and Medium Fleets (fleets with over 2,500 hp) will also be prohibited from adding a vehicle powered by a Tier 1 engine. Enforcement of the emission performance standards (fleet-average emission targets or Best Available Control Technology 'BACT' requirements) for large fleets will commence July 1, 2014 and then annually each January 1 thereafter.

Click here to see the CARB Regulatory Advisory #MSCD 13-25 describing the schedule it will follow to enforce all of the provisions of the regulation and other relevant information including a link to the CARB Knowledge Center for the Off-Road Diesel Vehicle Regulation.

Stay tuned for updates from the Construction Industry Air Quality Coalition (CIAQC) about the Off-Road Regulation, and other CARB diesel programs such as the Truck & Bus Regulation and the Portable Equipment Registration Program (PERP) as they becomes available.


CIAQC is a non-profit 501(c)(6) founded in 1989 by four southern California trade associations--Associated General Contractors of California, Building Industry Association of Southern California, Engineering Contractors Association and the Southern California Contractors Association.

These signatory contractor organizations, through the Southern California Industry Funds, created CIAQC to help their members understand and navigate the ever-increasing web of government environmental regulation under which they operate their businesses and build our communities, our infrastructure and the environmental systems that will enhance California’s future.

Today several organizations and individual construction firms throughout the state are active in CIAQC. Member associations now also include the Associated General Contractors America – San Diego Chapter, Inc., California Construction Trucking Association, United Contractors, and the California Rental Association.

CIAQC assists the construction industry and regulatory agencies in the development of environmental regulatory strategies that will balance the goals of a healthy environment and a healthy local economy with the least adverse impact on the construction industry.

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Supported by the Southern California Industry Advancement Funds and other organizations throughout the state.