The state has been a proponent for green cars.
A move from the Obama administration to make cars more fuel efficient and environmentally friendly is to be repealed by the current Trump administration.
The move will kickstart a drawn out process that will weaken current standards, and put the federal and Californian governments at loggerheads over the proposals.
According to the administrator of the US Environmental Protection Agency, Scott Pruitt (no, not the racing driver), the standards set out by the Obama administration for model year 2022 to 2025 were not inappropriate and should be changed.
Pruitt called the fleet-wide standards 'too high' and that they 'made assumptions about the standards that didn’t comport with reality.'
The standards that are set to be repealed called for fuel efficiency to be doubled across a company's range of US-sold cars by 2025 to 50mpg.
California meanwhile has had a waiver to be even stricter with car regulation. The most populous state in the US and a huge market for car sales has been a leader in green car innovation, and its lead has been followed by a number of other states, including New York, Pennsylvania and Massachusetts.
California's position on the matter has caused friction between both the state and the central government, and while Pruitt is in favour of states regulating themselves, he is against California's push for cleaner cars. 'It is in America’s best interest to have a national standard,' Pruitt said, with the western state's ability to regulate differently under scrutiny.
Naturally, California was not happy about the proposal. Mary Nichols, head of the California Air Resources Board, said California 'will vigorously defend the existing clean vehicle standards.'
California governor Jerry Brown added: 'This cynical and meretricious abuse of power will poison our air and jeopardise the health of all Americans.'