This is something I’ve heard a lot, and assuming it’s true, what’s the science behind it? Surely holes in masks are the same size no matter whether the germs are heading in or out, but I’m guessing it’s not about the holes and I’m missing something.
Obligatory disclaimer: I’m not an anti-masker, I’m still wearing it in shops for example. This is just me wanting to understand.
In: Biology
The flat masks that the majority of people wear are designed to simply stop us from projecting all of our germs on everyone else. Instead of blowing out a large plume of respiratory particles we just have small cloud around our faces. Air is still able to flow around our masks and thus we can still breathe in what is in the air around us. A respirator or n-95 type dust mask needs to be fitted, and when worn correctly will filter particles from the air. This will effectively reduce infection rates.
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