EPA Moves to Relax Emission Standards for Heavy-duty Trucks
WHO:
Phys.org - President Trump's administration is involved in the proposal to loosen truck pollution regulations.
NPR - The Trump administration, Environmental Protection Agency (EPA), trucking organizations, environmental groups, EPA administrator Lee Zeldin, Kelly Loeffler (head of the U.S. Small Business Administration), Katherine García (director of the Sierra Club's Clean Transportation for All campaign), Environmental Defense Fund.
WHAT:
Phys.org - The Trump administration's proposal is described as the latest environmental rollback benefiting makers of fossil fuel-burning vehicles.
NPR - The EPA proposed changes to Biden-era environmental rules aimed at reducing pollution from heavy-duty vehicles, including buses and large trucks.
NPR - The proposal includes scaling back and postponing two provisions related to emissions-reducing technology warranties and useful life.
NPR - The changes would save the trucking industry between $4,130 and $6,152 per affected diesel engine.
NPR - The proposed changes would increase ozone-forming nitrogen oxide pollution from heavy-duty trucks by 4.2% in 2030 and by 11.6% by 2055.
Fox News - The EPA proposes eliminating DEF-related engine deratements that force heavy-duty trucks and farm equipment into limp mode at five miles per hour.
WHERE:
NPR - The changes affect heavy-duty vehicles operating on U.S. roads.
WHEN:
NPR - The proposal is open for a period of public comment.
WHY:
NPR - The Trump administration describes the Biden-era rules as "unnecessary and unworkable."
NPR - Trucking organizations welcomed the changes, citing the need to avoid a "premature rollout of commercial motor vehicles with unproven engine technologies."
NPR - Environmental groups criticized the changes, arguing that weakening clean truck standards would lead to more toxic pollution and health hazards.
HOW:
Fox News - The EPA proposes eliminating DEF-related engine deratements that force heavy-duty trucks and farm equipment into limp mode at five miles per hour.
NPR - The EPA's proposal includes replacing the requirement for truck engines to automatically operate at reduced power with an alert to drivers if emissions reduction systems are not working.
(UPDATED July 10, 2026 10:07 UTC)
President Trump's administration is pushing a proposal to loosen truck pollution regulations, which is being described as the latest environmental rollback that favors manufacturers of fossil fuel-burning vehicles. The Environmental Protection Agency plans to eliminate DEF-related engine deratements that currently restrict heavy-duty trucks and farm equipment to a maximum speed of five miles per hour. This move is expected to significantly impact how these vehicles operate on the road.
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(UPDATED July 10, 2026 01:30 UTC)
The Trump administration's Environmental Protection Agency has proposed changes to Biden-era environmental rules that aim to reduce pollution from heavy-duty vehicles, including buses and large trucks. This proposal seeks to scale back certain emissions-reducing technology warranties and useful life provisions, potentially saving the trucking industry between $4,130 and $6,152 per affected diesel engine, but it could also increase nitrogen oxide pollution from heavy-duty trucks significantly by 2030 and 2055. While trucking organizations have welcomed the changes, arguing against the premature rollout of unproven technologies, environmental groups have criticized the move, stating it would lead to more toxic pollution and health hazards.