I’ve heard a lot of anti-maskers use the argument that since we breathe out CO2, it will become trapped in the mask and is dangerous to breathe back in.
Obviously, this isn’t the case, because doctors wear their masks for hours and hours on end while doing surgeries. However, I am wondering, how does it work?
In: Biology
In theory, you are also reinhaling the volume of air in your trachea, a mask adds a little bit more.
Your body would naturally adapt a slightly faster breathing rate, as it does all the time to balance blood O2 levels based on local atmosphere and exertion levels.
This is similar to those full face snorkel masks. Though those do add a significant amount of recycled air which can lead to problems, especially when you consider snorkels are used during a physical activity.
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