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Originally Posted by heero_yuy
Mainly because the type of mask available to the public does not stop all particles from leaving or entering the individual. Only a full medical grade mask can do that.
Anyway the rule, when it existed, only said cover the face. Anything would do from a mask or scarf to a bandana. Some people only wore a transparent visor that had zero effectiveness.
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Indeed, a surgical PPE grade mask, worn in very enclosed spaces does offer a decent level of protection something like 79-90% if I recall. Which is why in hospital nurses wear a face mask “and” a visor.
Cheapo masks, Cloth masks, scarves, bandanna, and such like aren’t worth the effort in reality.