Rotting trash baking in the sun
Dog poop that an owner thought was ok to leave in the middle of the sidewalk
Ethnic food wafting out apartment windows
Urine-y subway platforms (ok, that's kind of all the time)
The smells of a Brooklyn summer. It's a miracle I haven't passed out from holding my breath as I walk down the sidewalk.
(Ok so there are some good smells, too...probably. It just seems like these days I only notice the really horrid ones.)