Where I live there are trees everywhere and it doesn't smell strongly of anything until you get down towards the river, and sometimes that is a good thing (faint brine scent! smell of dirt & progress!) or a bad thing (wheeeeff what died in the river today?). But last summer there was that
nasty smell throughout NYC, and I swear I got a couple whiffs.
Capt. Izz--you live in Orlando, right? I can't really think of a more highly trafficked area, so I'm not surprised that you guys get some stank every now and then. More cars = more exhaust = more stank. But do you really want tourists biking into buses when their Mickey hats get in their eyes? Much more effective would be more widespread use of transit (and more transit--Florida's got one of the worst public-t systems in the country) I think.