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/cloudfront-us-east-2.images.arcpublishing.com/reuters/5C3R4FSHWJI5ZNU4SGV3SIOL5E.jpg "Explainer: N95? KF94? Which mask is best at protecting against COVID-19 | Reuters")
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N95 vs KN95 vs FFP3 & FFP2 masks – what's the difference?(1)
Comparison of Mask Ratings, Standards, and Filtration Effectiveness (N95, KN95, FFP1, FFP2) – Smart Air
