Do you think that the rules and regulations imposed to reduce...

Do you think that the rules and regulations imposed to reduce car exhaust pollution and increasing mileage per lt has anything at all to do with the decreases?

Carbon emissions: down 83%. NO
Ozone: down 25%. Lead: down 91%. YES
Nitrogen dioxide: down 60%. YES
Particulate matter: down 33%. YES
Sulfur dioxide: down 78% YES

So the exhaust regulations have reduced just about everything except carbon dioxide, which is what gloabal warming is about.