What's that smell?

There are a lot of sirens racing to and fro in midtown, maybe in search of the source of this mysterious smell that's hanging around:

http://www.nytimes.com/2007/01/08/nyregion/08cnd-odor.html

http://www.ny1.com/ny1/content/index.jsp?stid=1&aid=65718

I didn't smell it on the street, but I sure smelled something funny in the elevator.