TR: Sorry I was not specific, You are correct, if you are trapped under a metric ton of concrete, a mask is the least of your worries.
I was referring to the folks in surrounding buildings and outlying areas that were enveloped in the dust/debris cloud when the towers went down. I have heard that lots of those folks as well as some of the remaining rescue personnel are having respiratory problems from all of the particulate matter they took in that morning and in the rescue/recovery that followed.
Also, the airpacks most firefighters were wear are only good for 30-60 minutes breathable air in most cases.
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