California is rather strict on emissions. Other states don't care. I used to work for my state's version of the DMV and the only public facing page where one could report things was to report people who would not register their cars locally (many people who purchase very expensive cars chose to register them in Montana). There used to be a web page to report license plates that were worn and needed replacing (like the reflective coating wore off, or all the paint got scratched off).
Vehicle regulation in the US is piss poor. Here's the full list of states that require all passenger vehicles to be inspected for safety and emissions every year:
* New York
* Massachussets
* Vermont
Utah used to require safety inspections every year, but they eliminated them; there were no noticeable side effects [1].
"Safety Inspections" were generally just a grift for third-party repairshops to collect free money and I couldn't be happier that they are no longer a thing.
Be aware that "safety" and "emissions" are different. Emissions testing is still required biannually for newish vehicles and yearly for older ones.
[1] https://www.deseret.com/2017/3/9/20607904/lawmakers-remove-r...
I used to live in Massachusetts. I'm not sure it's a benchmark to look up to. If buy buy a brand new car from a dealer, your next stop must be an inspection station - a pointless waste of time and money. But if your car is older than 15 years? You're no longer required to have an annual emissions test. Pretty backwards.