Campfire and I think sunscreen. If I hadn't gone to college near an ethanol plant, I would have said homemade bread, but the ethanol plant made the small town smell almost like bread but it was enough of a difference that it became off putting.
Campfire and right before it rains. The smell of a campfire is primal and smells of safety for humans. I wish strawberry fields in June was on the list. I went berry picking last weekend, and the smell was divine!