White House press secretary Karoline Leavitt told reporters Trump will be joined at an event by Environmental Protection Agency administrator Lee Zeldin to formalise the rescission of then-President Barack Obama's 2009 scientific finding that carbon dioxide endangers human health.
The move was the largest deregulatory action in US history and estimated it would reduce costs for automakers by $US2,400 ($A3,392) per vehicle.
The move, which Trump's Republican administration formally proposed in July, marks its most sweeping climate change policy rollback to date and follows a string of regulatory cuts and other moves intended to unfetter fossil fuel development and stymie the rollout of clean energy.
An EPA spokesperson said the finding had been used by the Democratic Obama and Biden administrations to "justify trillions of dollars of greenhouse gas regulations covering new vehicles and engines".
Rules introduced by former president Joe Biden's administration in 2024 aimed to cut passenger vehicle fleetwide tailpipe emissions by nearly 50 by 2032 compared with 2027 projected levels.
The EPA forecast between 35 and 56 of new vehicles sold between 2030 and 2032 would need to be electric, and said the rules would result in net benefits of $US99 billion ($A140 billion) annually through 2055, including $US46 billion ($A65 billion) in reduced fuel costs, and $US16 billion ($A23 billion) in reduced maintenance and repair costs for drivers.
Consumers were expected to save an average of $US6,000 ($A8,481) over the lifetime of new vehicles from reduced fuel and maintenance costs.
A group representing major automakers asked the EPA in September to roll back aggressive vehicle emissions limits but argued the agency should still rewrite the Biden rules, saying they "still need to be revised to feasible levels to provide certainty for the industry".
"Such a contingency plan will be critical if motor vehicle GHG standards are retained or reinstated in some way," said the Alliance for Automotive Innovation, which represents General Motors, Toyota, Volkswagen and other major automakers.
The repeal will remove regulatory requirements to measure, report, certify, and comply with federal GHG emission standards for cars and trucks.
