The Truck & Engine Manufacturers Association, which represent companies like Daimler Trucks DTGGe.DE, Caterpillar CAT.N and Cummins CMI.N, previously raised concerns the EPA proposal could boost costs and result in customers keeping "their higher emitting trucks longer." EPA in March proposed tighter standards for 17 of the 33 subcategories of vocational and tractor vehicles including school buses, transit buses, commercial delivery trucks, and short-haul tractors. The agency said it will reopen the proposed GHG rules after passage in August of the climate and spending Inflation Reduction Act (IRA).