You've repeatedly chosen to ignore it by castigating California for having a large % of cities with the worst air quality in the country, as if everyone were on a level playing field. It appears you are now agreeing that the local conditions in the areas of the state with the worst pollution are tougher to deal with than is the case elsewhere, which is progress.
Because I'm pretty sure I said "they have known what causes smog for 70 years" one of those things being local air movement or the lack there of.
Now what do you think we have control over:
The lack of air movement that traps smog over a city?
Or what we burn, how much, how it's burned and where?
If you know of a way to get the air moving that would be pretty cool.
I guess we could use millions of tons of blasting agents to remove mountains and haul away rubble in rock trucks that burn 1,000 gallons of diesel per shift, but how environmentally friendly is that?
I was wondering if you'd suggest an "Atoms for Peace" approach, several nukes to knock the Tehachapis down by a couple thousand feet.
Checking the source, the ALA says the major cause of California's poor air quality is . . . PM from wildfires. You know, the ones made far worse by the AGCC that Dear Leader claims is a Chinese hoax. We certainly do need to increase management fires when possible, but as has been pointed out to you before, most (57%) of California's forests are national forests, i.e. federal land.
We don't have the worst air quality in the nation and I would say they are doing pretty good for only smog testing vehicles made after 1983 and not having our own special emissions standards.
Oh and I know enforcement totally sucks, have seen plenty of junkers that were made well after 1983 around Albuquerque and Las cruces that would never pass any kind of emissions test.
The best place to start would be to enforce the laws they have now.
NM is doing pretty good, with two cities in the top 30 despite your lack of population? Yet you said it would be fine if California's oldest, dirtiest trucks which can no longer be registered here were moved to New Mexico, while simultaneously criticizing California for incrementalism.
I'm pretty sure my leaf would pass and I bet my wife's 2018 Hyundai hybrid would pass of they went state wide.
New mexico also ranks in the bottom 5 or 6 for electric vehicle sales and has almost no public charging out side the big cities. There's a bit of room for improvement there.
There's plenty of room for improvement in every state of the union, and every country in the world.