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9 Apr 2018 . Even the best performing masks did not always reduce exposure . In November 2016, the Chinese National Institute of Standardization issued a new guideline to . Volunteers performed two simulation tests, designed to reflect . for 3M9322 to 67.3% IQR: 56.6%–75.2% for the Yi Jie PM2.5 mask.
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3 Dec 2019 . Only a P2 mask sold in hardware stores is effective against PM2.5 . are all at particular risk, and New South Wales Health advises them to . However, evidence suggests they may not work in practice as they require an extremely good fit. . 'Absolutely suffocating': how are you affected by smoke haze from .
1 Mar 2020 . Researchers randomly assigned people to wear surgical masks or N95 masks. Then they . A majority 68% guessed N95, so I'm not alone in my intuition. N95 . Both masks performed just as well at preventing the transmission of the viruses. . New comments to this discussion, Replies to my comments.
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