The U.S. Environmental Protection Agency on Thursday proposed easing heavy-truck and engine emissions rules adopted under Democrat President Joe Biden in 2023.
The EPA said it was proposing scaling back emissions warranty requirements and providing additional lead time before longer regulatory useful life requirements take effect.
The EPA, which noted that some 2027 medium and heavy-duty engine development programs have experienced technical challenges, is proposing allowing manufacturers to continue to sell current products while they complete development of 2027-compliant engines.
