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.
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.