I was in Santa Fe last year and went to Home Depot. While walking across the parking lot my nose was hit by an old smell that I had to stop and think about.

Then I looked up and saw a 1966 Chevy pickup going by and realized the smell was unburned gas. It was weird that it stood out like that, but Santa Fe is somewhat out there by itself, and the Home Depot is on the edge of town, so the air is really clean.

I finally figured out the smell reminded me of Downtown Dallas in the 60's when there were out of tune cars everywhere.

While smog checks are a hassle I would not want to go back to the good old days of smog belching autos.