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
Think about the fact that when we perform CPR we are literally exhaling directly into their lungs. If there was enough CO2 in a human exhale to harm someone why would we perform life saving CPR with that exhale? Our exhale does have some CO2 in it but our exhale is also still full of O2, we don’t use all of the O2 we inhale and whatever isn’t used comes back out in our exhale. The average human exhale is entirely safe to breathe in, it just is, which is why we’re able to use it to save people’s lives with CPR.
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