If that's the case, how can California have auto safety standards or standards for gasoline that are more strict than other states?
Thanks.
Your point is correct as to the Clean Air Act. But, e.g. One state can't threaten economic sanctions against another state if pollution from one drifts into the other, undermining that state's higher standards.
Another example is GMO labeling requirements. These are being challenged as violating the dormant commerce clause by placing an undue burden on interstate commerce.
Thank you for replying. Have an upvote.