You're totally right, my comment was far too simplistic. However it captures the feelings at the time, cars at that time were far "cleaner" in that they smelled

You're totally right, my comment was far too simplistic. However it captures the feelings at the time, cars at that time were far "cleaner" in that they smelled a lot better, did not clog streets with excrement etc Obviously play the car out a few decades and the emissions were _not_ so clean.