I am in FL. I purchased a new 2024 F150 last year and noticed that it is CA compliant. Since I was curious I looked it up. Maybe 70% of new vehicles are CA, NY, CT, etc compliant. It seems it is simply easier for manufacturers to meet one standard instead of many. 18 states including CA have tougher than federal emission standards.
The EPA may not be unConstitutional, any more than the FAA is. But the EPA writing laws, enforcing those laws and judging the guilt of those who run afoul of those laws, certainly is.
Many people are unaware that the EPA uses the so called "interstate commerce clause" as the basis to regulate the manufacturers. The EPA, until quite recently, had absolutely no jurisdiction over the individual. Instead, that duty fell to the states. Then some minor changes were made that went unnoticed. And the EPA suddenly had control over individuals, clearly in violation of the Constitution and the basis used for regulating commerce. 3 branches of govt in one. Regulate (legislative, write the rules), Enforce (Executive branch, fines for example) and Judge your guilt (Judicial, incarcerate, including set terms of)