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https://www.wsj.com/articles/why-are-n95-masks-so-important-11591026684 Level 3 Surgical Mask

What makes an N95 different from other face masks?

N95 masks are so called because they are a U.S. standard that requires masks to be able to filter out at least 95% of very small particles, including droplets containing the coronavirus. They are typically worn by medical workers as well as employees at factories working with paint or industrial chemicals, for instance.

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Respirator Fp3 Mask This copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djreprints.com.