The label confirms what everyone understood prior to the mask mania of COVID: Neither masks nor N95 respirators can stop aerosols, certainly not viral ones, which are much smaller than bacteria. What's truly revealing is that the label recommends against relying on them for source protection even against asbestos particles, which are on average 5 microns – 50 times larger than SARS-CoV-2 virions.
A large randomized controlled trial published just months before the discovery of SARS-CoV-2 — before masking became a political and social control tool — showed no benefit to N95s over surgical masks in terms of protection against the flu.
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