How is it not dangerous to breathe in the CO2 that we breathe out into our masks?

Question

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

Answer 1

CO² doesn’t “get stuck” in the mask, the same way that oxygen doesn’t get stuck outside of it, suffocating you.

You exhale, and the spent oxygen passes through the mask and away from your face.

It’s pretty simple, grade-school stuff. Which is why anti-maskers don’t get it.