If you are standing outside the Merchandise Mart in Chicago. Or the Suntimes building near the Chicago River, what do you smell nearly every working day of the week?

(and it's not the river, sewage, exhaust, nor pollution)

The Blommer chocolate factory

http://www.lynnbecker.com/repeat/blommer/blommer.htm

That's right... wow, that was very quick. It still smells like chocolate all the time even though the article claims the smell will be removed using filters.