How would contamination get onto the mask, other than you? It seems like a strict improvement, even if it isn’t much improvement. Also the contamination should at least be only on one side of the mask.
I would expect that people in the general public are not careful to avoid touching their masks with their hands before putting them on.
With a filtration rate of 60% I don’t see how the contamination will stay on one side of the mask. Especially when it is wet after breathing in it for a while.
If there’s contamination on your mask and you blow air through your mask, aren’t you also blowing the contamination on other people?
How would contamination get onto the mask, other than you? It seems like a strict improvement, even if it isn’t much improvement. Also the contamination should at least be only on one side of the mask.
I would expect that people in the general public are not careful to avoid touching their masks with their hands before putting them on.
With a filtration rate of 60% I don’t see how the contamination will stay on one side of the mask. Especially when it is wet after breathing in it for a while.