Turns out someone had just opened two packets of Parmesan Cheese for their salad. The smell must have gotten in the venting system and spread around the area. Now who believes any cheese could be that potent, really! The funniest part of this is that both EH&S and Facilities have to write this up in their reports! (I think we can safely say, next time ,if there is a real emergency, no one will show up!)
FYII - For those sensitive to molds cheese can be very sickening. So, I do hope that someone will show up if there is an emergency.