Today when I was getting out of the taxi at the Richmond Airport, I said "It smells like waffles."
The cab driver told me that the Nabisco plant wasn't far away, so I was probably smelling cookies baking by the thousands.
When I lived in my first apartment down by the beach in Ventura at 1160 Pittsfield Lane, the evening air was often scented by lemons being boiled down into lemonade concentrate. It was like a room freshener, but it was a whole neighborhood freshener.
The best smell of all was in Chicago near the Milk Dud factory. Boiling caramel and chocolate all together - I think that must be what heaven smells like.
Do you have experience with ambient smells?