“Actually in 1950 we didn’t have any EPA or air regulations and the air was great.”
Obviously, you are talking about rural areas where the air is still likely to be just as great, if not better than it was in 1950. If you had ventured into NYC, Boston, Philadelphia, Chicago, or L.A. during the '50s, you would have found air that was “visible”, due to the incredible amount of particulate matter in it.
When I was in my teens, we lived ~15 miles from NYC, and my father soon regretted buying a white Plymouth, because it would appear gray and grimy within just a day or two after being washed. The runoff of rain from the roof’s rain gutters actually caused black streaks to form in the white paint and those streaks could only be removed by compounding the paint.
The air where you lived in the '50s may have been “great”, but that certainly wasn’t the case for the bulk of the US population at that time.