Yes there is, 49 states must seek policy exemptions from the EPA and win approval for them, while California has no such burden. CA gets a perpetual exemption allowing them freedom no other state gets.

Edit: I was actually wrong here, no other state may even ask for a waiver.

> This power is reserved alone for California, and it only covers pollution from cars. No other state can ask for a waiver. (In all of federal law, this might be the only time that a specific state is given special authority under such a major statute.)

https://www.theatlantic.com/science/archive/2017/03/trump-ca...

Then maybe another state could sue and possibly get make it so all states could get a waiver (since it sounds at least a little like the ports betting law):

https://www.nytimes.com/2018/05/14/us/politics/supreme-court...

When Congress passed the Clean Air Act they wrote an exception for California into the law. If they don't like it they should get Congress to change the law.