this post was submitted on 27 Dec 2023
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This is misinformation. Masks are rated based on 0.3 micron particles because that's the size that's hardest to filter. Smaller particles are actually more likely to be filtered due to how they move.
https://www.safetyandhealthmagazine.com/articles/20459-osha-updates-faqs-to-address-particle-sizes-and-n95s