I would say air pollution an is a national problem. Other than that you’d be right. The EPA has cleaned up the air. Since I was a kid in the 60’s it is night and day. But they have grown onto a maniacal beast. Just go back to clean air and water and nix everything else they are into like “climate change”.
The air got where it needed to be by about seventy-eight, judging by my drives through Ponca City and other refinery towns. Those standards are something the state’s can maintain, and I don’t see any likelihood of any municipalities not maintaining at least those standards today.
Again, it is not a task that requires the federal government or else it won’t happen.