A Mask Q&A: Addressing common questions about the KN95, N95 …
https://publichealth.wvu.edu/news/story/?headline=a-mask-q-addressing-common-questions-aboutkn95-n95-mask-and-more
WEBJan 24, 2022 · A KN95 mask is made to filter at least 95% of particles of size down to 3 microns in diameter. It permits 8% or less leakage, by Chinese standards. A medical procedure mask, or surgical mask, fits loosely and will stop large droplets and particles, but does not stop small droplets.
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