This feels like deja vous. Didn't this happen before, rather recently? A smell in NYC, I think it was a sweet smell like candy, that permeated a few blocks? And it was attributed to the winds inversion layer or something like that?
I answered my own question. This one:
http://www.freerepublic.com/focus/f-chat/1510878/posts
and this one from last march:
http://www.freerepublic.com/focus/f-chat/1588517/posts