The irony. And a good response from this guy, that pretty much states that!
(media.greatawakening.win)
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Hook yourself to an O2 monitor and see what your readings are with and without a mask. Unless your mask is made out of a screen, or VERY thin material (which makes it virtually useless even for catching sneezes), you will see a drop in your oxygen levels when breathing with a mask on. I was in the hospital for a kidney stone (didn't know it was a stone at the time) and they made me wear a mask in the ER. While hooked up to all the monitoring equipment, I checked the change in oxygen levels with and w/o the mask, because I had read that it decreased your oxygen, but I thought "there is such a small amount of volume inside the mask, how could it significantly drop oxygen levels in your blood?", but sure enough, 5 or 6 points of change occurred.
If I ever get the chance, I'm actually gonna give that a try. I still find the masks to be far worse in itch factor than air quality though, and the constantly fogging sunglasses are a pain.
They sell the fingertip oxygen sensors for a pretty low price now, that work with a smart phone.