Polyurethane plant fire - GIF

[JoeVanGeaux]

When chemical plants catch fire it often loos as if the whole world is on fire the noxious gasses from the smoke can be just as deadly as the fire itself

Absolutely correct! In the case of polyurethanes the two biggies are carbon monoxide and hydrogen cyanide. The first one you'd expect, but the second one is no breath of fresh air, either!!