At present,BBN Health Group has three KN95 mask production lines,the daily production capacity has increased from less than 10,000 to 30,000; the number of disposable flat mask production lines has more than 10,with a daily output of one million.An Association between Air Pollution and Mortality in Six Background Recent studies have reported associations between particulate air pollution and daily mortality rates.Population-based,cross-sectional studies of metropolitan areas in the United StateAre cloth masks a substitute to medical masks in reducing The second one 24 analyzed three different cloth masks and reported that the best result was achieved by the twill cloth mask(93.6±1.16) with no difference compared to Hopes & surgical mask (98.1 ± 1.02,p < 0.05),and the last one 27 concluded that the surgical mask with two filter screens presented 60-80% of filtration efficiency while
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