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When a healthy person wears a face mask, they continuously re-rebreathe a portion of the CO2 that comes out of their lungs. Of course, there are many different types of masks that vary in such CO2 concentration, but the principal remains the same. Breathing air that is too rich in CO2 has its own negative health effects! Humans breathe in air that is approximately 20.95% oxygen, 78.09% nitrogen, 0.93% argon, and 0.04% (400 ppm) of carbon dioxide. Upon exhaling your breath contains approximately 3.8% CO2. Now, people are not dropping dead because they breathe higher-than-normal concentrations of CO2. How many of you survived as kids hiding under the covers with a flashlight after bedtime? (Likely, all of you!)


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