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ye there are lots, i gave one of the easiest examples for you to understand.
And yes if there is a very small amount of anthrax (which occurs naturally int he environment by the way)you might be ok with a face mask since the exposure is only slightly above background, particularly if its for a short period of time. However if you happen to work in a place where there is an only slightly above background presence of anthrax, but youll be around it 24/7 then greater measures are likely to be taken.
So yes, the length of exposure is as much a factor as the level of threat. Why do you think it is hazmat clean up crws use full hazmat suits when they deal with things day after day, yet the same chemicals for short term interaction are often ok with a more minimal protections? such as when working with it in a lab.
I dot use full hazmat when i work with mercury, but a hazmat cleanup crew would if dealing with cleanup of mercury because they are exposed all day everyday doing various cleanups whereas im just exposed in short bursts if at all.
