Och
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However they fine-tune the numbers, I don't think there's much question that today's cars, in general, pollute a lot less today than they did years ago In cities lacking heavy smokestack industries and where vehicles do most of the air-pollution (the D.C. area where I live is an example), there are generally fewer Code-Orange and Code-Red smog days now than there were decades ago, even when there were many fewer vehicles on the road. That the number of vehicles in and around major cities can increase like they have (there are probably two or three times the number of cars in the D.C. area than back when I learned to drive 45 years ago), while at the same time, the average quality of the air has actually improved, to me, is remarkable. It testifies to the effectiveness of emission controls (the VW scandal notwithstanding, of course).
Absolutely, but thats mostly because we no longer have cars without EFI and without catalytic converters. I don't think however there is much real life difference between say 1995 Civic vs 2015 Civic, or any other comparable cars that are equipped with these systems.