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Originally Posted by mugwump
So, we have 3(?) categories: 1) trapped with absence of/diminishing O2; 2) nasty, filterable stuff that'll kill you; 3) injuries that prevent inspiration.
Seems like the only one to reasonably plan for is #2. a) Short term: particulates - smoke (high rise fire) or radiologics or bioagents; b) short term: nasty gases; c) mid to long term intermittent exposure to infectious agents or spores, dust (1930s dust bowl), radiologics.
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May also include under c) debris from a 9/11 WTC style collapse. A lot of those folks are having big problems because of breathing all that stuff in that day.