Jeff, I don't ideologically believe in states rights, but I DO believe our government should allow California to set its own standards. ALLOWING states to set their own standards is not in conflict with my belief that a state's rights are submissive to national rights.
Ignoring all the fluff, logically, yes it is in conflict.
supporting the government allowing states to set more stringent emissions requirements
Its gone beyond what is needed.
Imagine being a scientist or bureaucrat in California CARB, you need a reason to justify your existence, well "make up" more "pollution". All the original efforts by CA have been noble and right.
Right up until it FORCED MTBE on the populous ... then it went to crap and did more damage than polluted cars have ever done.
CA disallows Diesels from Europe which is outrageous, those are so much "cleaner" than cars 10 years older still on the road.
Just like with EVERYTHING, at somepoint you have reached a theoretical point where more restrictions isn't going to help given the amount of effort. Known as diminishing returns. Focus on Electric infrastructure, focus on change, not more regulations.
As a conservative I believe in a clean environment. I also believe there are better things the state should focus on with better returns.