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Xiao and colleagues reviewed non pharmaceutical measures for prevention of influenza.10 They identified 10 randomised controlled trials published between 1946 and 2018 that tested the efficacy of face masks (including standard surgical masks and commercially produced paper face masks designed for the public) for preventing laboratory confirmed

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California to purchase masks from Chinese EV maker BYD

"A production line for high quality face masks requires about 1,300 parts for various gears, chains, and rollers, 90% of which are BYD's self made parts," said Sherry Li, director general of BYD's

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The enhanced aerosol depolarization ratio firmly demonstrates a vertical structure of aerosol associated with ASM over the east of South Asia. Overall, it is worth noting that an elevated aerosol layer at heights from 1 to 5 km is identified in the west (50°65° E) and east (80°105° E) regions of the South Asia.

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