Under current law they can’t but they can tax the other way around which is very unfortunate and should be illegal.
The only way they can tax more is on something substitive like weight.
https://www.autoblog.com/2019/10/28/aut ... emissions/GM, Toyota, FCA back Trump on California emissions standoff
However, they still want the feds to strike a 'middle ground' with California
https://www.autoblog.com/2019/11/08/tru ... emissions/DOJ subpoenas automakers who sided with California against Trump
How might one keep the atmosphere of a state from mixing with other state's atmosphere?
The people of New Mexico shouldn't be free to decide that for themselves?
For the whole world?