There was some sort of issue in Calif about 10 years ago where trucks (18 wheeler types in this case) on the road would no longer meet the emissions rules, so new trucks had to be purchased. But the truck owner’s didn’t take to this idea kindly, as you might expect. I can’t remember how it was all resolved, but it probably involved a good deal of money changing hands … lol …
Calif sometimes goes off on a tangent & shoots itself in the foot. 15 years ago or there-a-bouts the Calif politicos passed a law requiring a chemical called MTBE be put into the fuel to lower emissions. Unfortunately some vehicle designs were not compatible w/MTBE, and a lot of damage was done to those vehicles. I think it was mostly Mercedes vehicles that got hit the worst. Again I don’t recall how it was all resolved, but again I expect a lot of money changed hands. The MTBE also polluted lakes and streams, another unexpected event, and that caused the end of the MTBE fiasco for good.