The Environmental Protection Agency (EPA) on Thursday proposed a rule to scale back and postpone emission regulations for heavy-duty vehicles, such as buses and large trucks. The proposal aims to modify standards established during the Biden administration regarding the warranty and useful life of emissions-reducing technology. If finalized, the rule would also remove a requirement for truck engines to automatically reduce power when emissions systems fail, replacing the mandate with a driver alert system.
EPA Administrator Lee Zeldin stated that the changes would prevent manufacturers from being "forced to rush products to market before they're ready" and reduce costs for vehicle operators. The agency's analysis estimated that the plan would save the trucking industry between $4,130 and $6,152 per diesel engine. Environmental groups have criticized the move, noting EPA data projected the changes would increase nitrogen oxide pollution from heavy-duty trucks by 4.2% in 2030 and 11.6% by 2055.
Industry groups, including the American Trucking Associations, advocated for the revision, describing previous standards as reliant on "unproven engine technologies." The proposal allows manufacturers to pay non-conformance penalties as an alternative to meeting specific standards while developing compliant engines. The EPA did not model the potential air quality or health impacts of the proposal, which is now open for public comment.