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I made an experiment at home. I measured my blood-oxigen levels with a Pulse Oximetry sensor. It showed 93%. I then put on a N95 mask and worked out on my ellyptical for 30 minutes. Then I immediately measured again, and it showed 95%. It actually went UP! Your claim that masks cause you to raise CO2 levels in your body is bullshit. And it makes sense, becasue gas molecules are so tiny that they have no problem going through a mask. However, I accept the fact that it traps more HEAT, and therefore it makes you feel more stuffy. But that has NOTHING to do with supposedly breathing in more CO2!

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Yes I think wearing a mask just causes you to breathe more to compensate, perhaps to the point where you get hyperventilation syndrome if you take it off.

Trapping heat should help to prevent viruses for the same reason that you’re more likely to get a cold in the winter.

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