https://en.m.wikipedia.org/wiki/Carbogen
its called carbogen
e, "A carbogen mixture of 95% oxygen and 5% carbon dioxide can be used as part of the early treatment of central retinal artery occlusion. " so low percentage of co2 works fine.
hypoxia
no actually it isnt. the person has still regular amounts of oxygen just more co2. with a mask it can cause this sort of effect moreso than hypoxia i can see.
The issue is, co2 stays in the mask and the mask restricts respiration. Which is why o2 levels fall. Normal o2 levels remain outside the mask. The mask also limits normal respiratory exchange requiring slightly longer breathing cycles to obtain normal function. Are people doing this? The result is a build up of co2 and reduced o2 levels. Classic hypoxia scenario.
This is why I am curious to see people measured with a pulseox to see what's actually walking around.
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