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"With prolonged weakness in freight demand and inflationary cost pressures, the rule’s 2027 implementation timeline threatens to intensify strain across our industry," ATA said.

“We have heard loud and clear from small businesses across the United States that the current DEF system is unacceptable," EPA Administrator Lee Zeldin said.

Daimler, International, Paccar and Volvo Group are suing the California Air Resources Board on grounds that federal actions vacated the state’s efforts to enforce its own emissions rules.

GHG3 was rolled out under the Biden administration but came under heavy fire from trucking stakeholders, many of whom characterized it as damaging to carriers.

Days after the engine's first showcase at ATA's TMC 2025 annual meeting, the Trump administration warned EPA regulations for heavy-duty trucks would be reassessed, with rollback likely.

The EPA's plan this week to relax rules aimed at cleaning up auto tailpipe emissions is the latest Trump administration move to undo incentives for automakers to go electric.

The rule had "put the trucking industry on a path to economic ruin and would have crippled our supply chain, disrupted deliveries and raised prices," said ATA President Chris Spear.

The Trump administration is formally proposing to scrap the U.S. government’s authority to regulate greenhouse gases as an air pollutant.

Mack Trucks and International Motors were two of the three winners in an auction of environmental credits owned by bankrupt hydrogen fuel cell Class 8 truck maker Nikola, according to documents.

Earlier this month, nearly 100 representatives of medium- and heavy-duty truck dealers gathered in Washington, advocating for common-sense policies supporting the trucking industry.