Settled. Masks are not OSHA approved.
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Irrelevant.
After one breath the oxygen levels drops. At some point equilibrium is reached, but it is at a level below recommended, which causes hypoxia and acidosis of the blood.
Where is your evidence that equilibrium is reached? When you breath in, are you breathing in a larger volume than the mask contains? If so, where is THAT air coming from? What is the oxygen content of that air?
My god you're dumb.