COVID 19: KN95 masks are not as effective as N95 masks. Per HealthLine.com they can still be useful outside of high risk settings.
Answered 1/24/2021
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Efficacy: The N95 mask has been chosen as the one to wear in the future if traveling by air, and is used preferentially, where available by medical professionals. HOWEVER, there are regional shortages of N95 at this time, so may take effort to locate.
Answered 1/25/2021
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