Like the mystery smell that took over the NYU law school library last month, the cause is unknown.

This sounds worrisome. Con Edison is investigating.

This natural-gas odor is being detected in midtown and downtown Manhattan, home to countless law firms. If you're noticing this smell in your workplace, feel free to share your firsthand account of it (after securing your own gas mask).

Gas Smelled Over Large Area Of Manhattan [NBC via Drudge Report]
Gas-Like Odor Permeates Parts of New York City [Associated Press]