Face masks do not cause carbon dioxide poisoning
This claim gets a lot of attention, but it’s simply not true that masks cause carbon dioxide poisoning. Carbon dioxide molecules are too small to be trapped by the fabric in a mask. What does get reflected back by the mask is moisture and heat and ambient scents, but carbon dioxide does not accumulate. If that were the case, then doctors would be wearing something else during their long shifts. They can spend whole days and even perform whole procedures with their face covered, and it does not impact their ability to breathe or move or think.
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