What's in Sno-Seal? I ask because of the chemical reaction that transmitted into the air - then into your lungs after the ML is fired - not only when there's a head wind, but lingering smoke in the area.

Lehigh has been around forever, is safe & won't freeze. The original formula is supposedly back. Be careful when burning chemicals. If you have real questions about interactions, there are a few firemen -- even abatallion chief,who post in forums like this one.His screen name is Batchief at some messageboards.