In the era of mandatory facemasks, KN95 masks reign supreme when it comes to its recommendations from the health experts and its use by people who are more concerned about the safety of their immediate surrounding than to just fulfil the task of wearing a mask just because it is necessary.
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The science behind facemasks is that it prevents someone carrying the diseases from expelling the infected droplets into the air via speaking, coughing, sneezing or even just breathing the same space as the healthy for too long. The use of Facemasks discourages the touching of the face and it could become an effective 2nd line of defence after the proper use of handwash and hand sanitization.