Heavy-Duty (Tractor-Trailer) Greenhouse Gas Regulation

This page last reviewed December 2, 2014

Heavy-Duty Vehicle Greenhouse Gas Emission Reduction Regulation


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The California Air Resources Board (ARB) in December 2008 adopted a new regulation to reduce greenhouse gas emissions by improving the fuel efficiency of heavy-duty tractors that pull 53-foot or longer box-type trailers.  Fuel efficiency is improved through improvements in tractor and trailer aerodynamics and the use of low rolling resistance tires.

The regulation is expected to reduce greenhouse gas emissions by approximately 0.7 million metric tons of carbon dioxide-equivalents by 2020, statewide.  Over the 11 years between 2010, when the rule went into effect, and the end of 2020, it is estimated that truckers and trucking companies will save about $5.1 billion when diesel fuel consumption is reduced by as much as 500 million gallons in California and 3.3 billion gallons across the nation.

The tractors and trailers subject to this regulation must use U.S. Environmental Protection Agency SmartWaySM certified tractors and trailers, or retrofit their existing fleet with SmartWay verified technologies. For further information, please call 866-6DIESEL (866-634-3735) or email at: 8666diesel@arb.ca.gov. Financial assistance is available through an ARB loan program and the Federal SmartWay Finance Program. More information can also be found at the federally-funded Diesel Emissions Reduction National Program (DERA).

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What's New

  • U.S. EPA has Granted ARB a Waiver Authorizing Enforcement of Tractor-Trailer Greenhouse Gas Regulation (Posted October 21, 2014)
    The California Air Resources Board (ARB) has issued Advisory MSC# 14-17 notifying interested stakeholders that on July 30, 2014, the U.S. Environmental Protection Agency granted ARB a waiver pursuant to section 209(b) of the federal Clean Air Act for California’s Tractor-Trailer GHG Regulation. This waiver authorizes ARB to enforce specific provisions of the Tractor-Trailer GHG Regulation applicable to 2011 through 2013 model year Class 8 tractors equipped with integrated sleeper berths and to 2011 and subsequent model year 53 foot and longer dry-van and refrigerated-van trailers that are pulled by such tractors on California highways.