[x SF med]

TR-
you did not ask about probabilities for the situations, just the situations, so I took a walk down memory lane, and pulled conceivable situations. The flooding was for the COL, even though the waters are receding, because he sent the damn rain my way.

I'm not sure if I buy your particulate / filter argument - breathability is compromised, and without quick action there are long term issues that will affect survivability. Esp. in the NBC scenario, without protection form the Cesium 123 / or various incapacitating agents you are in deep deep kimshi - anything harder than an incap agt - well you're basically screwed anyway (yup NBC school put the fear of chem war into me).

In the most likely situations - Fire/smoke, non incidiary particulates - common sense should prevail, as long as you have your drive on rag and remember how to low crawl with a purpose.

Mug - dust can be categorized into the bio category also, most of the deaths from dust storms are delayed - due to soil borne contaminants (mycoplasmic spores / dormant viruses ie. pneumonae mycoplasmiae, p.viriliae, a whole series of v. shigellae - thank you to the d.board at medlab, my one attendance required the study of the "pneu" section of the Merck, and as extra credit I was required to have a good understandin of the section "resp")