India did this 10 years ago, total ban on diesel in many cities with air quality problems. The solution was conversion of old diesels to Natural Gas. Simple, kinda cheap, definitely cleaner. If India with 4 times our population can do it in a year or two, We can do it too once the idiots who fight every change in status quo are shut down.What I'm hoping to see is professional truckers taking a stand on this. Refuse to enter California, period. And see how long the ban lasts. How many 18 wheelers are NOT powered by diesel?
These were all tiny diesels, now they are all CNG.
So if you own a diesel RV, ya might have to convert to compressed natural gas.
They run better, quieter and zero smell. Even cheaper to run since filtering diesel fuel is a major expense and CNG is clean.