That would be near impossible in the Federal system we have. It is the purview of the state to license vehicles on its roads and to determine what characteristi

That would be near impossible in the Federal system we have. It is the purview of the state to license vehicles on its roads and to determine what characteristics the vehicles must have in order to be given a license. But as much as some areas are concerned with emissions, 17 states don't even do any emissions testing and of the remaining 33 states that do, only 10 require emissions testing statewide instead of in just a few areas. I can see some of the blue areas banning all sorts of things, but the red areas wont, and there are constitutionality issues with trying to stretch the commerce clause to things like forcing states to ban certain types of technology. Even the Federal highway speed limits have been a constitutional nightmare and many states no longer follow the national speed limits, which were also designed to improve on fuel economy and reduce emissions (e.g. https://www.newsweek.com/kentucky-judge-rules-states-speed-limit-laws-are-unconstitutional-inconsistent-unclear-1460579 https://www.newsweek.com/kentucky-judge-rules-states-speed-l...)