Trucking organizations are asking the federal government to delay delay in the implementation of EPA’s heavy-duty NOx rule until 2031.
A coalition of trucking associations earlier this week called on the Environmental Protection Agency to delay implementation of its heavy-duty NOx rule, citing substantial added costs amid already-existing economic and operational pressures facing the trucking industry.
In a letter to EPA Administrator Lee Zeldin, the industry thanked the EPA for engaging with industry stakeholders and for its March 12 announcement to reevaluate the heavy-duty NOx regulation, finalized in January 2023. The letter was signed by the American Trucking Associations, its federation of 49 state trucking associations, the Truckload Carriers Association, and the National Tank Truck Carriers.
The letter said modern trucks already meet stringent emissions standards, producing 99% fewer NOx and particulate matter emissions than previous generations. The letter’s signatories said delaying the rule would preserve affordable, reliable equipment while allowing continued environmental progress.
“As finalized, the heavy-duty NOₓ rule imposes substantial compliance costs and operational burdens at a time when the trucking industry is already contending with historically difficult market conditions,” said the letter. “With prolonged weakness in freight demand and inflationary cost pressures, the rule’s 2027 implementation timeline threatens to intensify strain across our industry.”
The letter also urged EPA to conduct a full reconsideration of the regulation’s provisions — such as stringency levels, warranty obligations, useful life requirements, and technical elements — and finalize any changes by the end of 2026 to give manufacturers adequate lead time for the 2031 implementation.
“An implementation delay will provide much-needed near-term certainty, and a full reconsideration of the heavy-duty standards will help ensure the trucking industry’s ability to affordably deliver our nation’s freight in a safe and efficient way,” the letter said..
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