今晚NBC的Nightly News CDC官宣 mask guidance

来源: 于 2022-01-11 15:52:48 [旧帖] [给我悄悄话] 本文已被阅读：次

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N-95 made in USA

KN-95 made in China

KF-94 made in Korea

 

Filtration: According to the CDC, when worn properly fitted to the face, N95 masks are meant to filter out at least 95% of tiny airborne particles. KN95 masks also filter out at least 95% of particles per China’s regulations, but the NIOSH regulations of N95 masks are considered to be stricter. KF94s block at least 94% of particles, according to studies.