Facemasks are not only moist germ collectors and spreaders, they make an oxygen deficient atmosphere, which would be even a higher percentage when breathing lightly on an airplane.
OSHA oxygen level test for masks
Jun 20, 2020
Facemasks are not only moist germ collectors and spreaders, they make an oxygen deficient atmosphere, which would be even a higher percentage when breathing lightly on an airplane.
Jun 20, 2020
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