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[–]Tums_is_Smut_bkwrds 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

N95 masks are very effective for the smaller particles; 'attractive' properties of molecules result in their getting captured by the fibers. This is why you can't wash and re-use them, as it ruins these properties. The mask are also effective for larger molecules. It's the mid-sized molecules that are harder to effectively block and in fact the N95 moniker means that the mask blocks 95% of mid-sized molecules.

There are numerous vids on YT that explain it fully, if you're interested.