It all comes down to the problem of California setting impossible standards for themselves that the rest of the country must pay for. God knows we have our local problems in Michigan but we’ve taken repeated hits from California automotive dictates.
California is in a difficult geographic situation. It has valleys that trap local air emissions in places that are both bustling shipping/travel corridors and heavily populated business/residential areas.
I was in L.A. during the early 80’s and it was bad, like “no ventilation outdoors” bad. Locals told me it was like that during much of the year.
Maybe for the longer term they can arrange some kind of rail transport between the ports and areas that are less prone to trap air pollution that can serve as truck depots.
In the meantime, regulations to mitigate the situation should have at least a tenuous connection to truth and facts.