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1. Dust blocking efficiency The dust blocking efficiency of the mask is based on its blocking efficiency of fine dust, especially respirable dust below 2.5 microns. Because this particle size of dust can be directly into the alveoli, human health caused the greatest impact. Dust respirators, made...Read more »
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1. Wear a mask during the season of high incidence of influenza, in the days of smog and dust, when you are ill or go to the hospital for medical treatment. In the winter, the old people with low immunity, the sickly people had better wear a mask when they go out. 2. Most of the colorful masks ar...Read more »