anti-pollution when did it start

Nothing was always.

We are all too young to been around in the 1920's but back then those older Model A cars used to smoke, that was normal.

The was a time when no traffic lights existed.

As for the smell from the cars, heck they were cleaner then horses. What do you think happen to all the horse crap, lol. When a horse died many folks just dragged them off to the side of the road and let the wild animals feed on them.

It wasn't all pretty like the movies show the 1800's, life was rough.