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high quality anti dust pm2 5 for chaoyang. DescriptionBest Rated N95 Medical Masks 2020 Top 14 ReviewsNote:miyoo PM2.5 Mask is made of Velvet fabric.We recommend it for fall and winter seasons, or where it is not hot.Our Brand "miyoo direct" is only seller who sell this PM2.5 Masks.miyoohighquality antipollution mask is made with ultrasoft material.Protection against gases, smells, all Respirators & Masks_Product WAIMAOTONGCheap Price Pm2.5 Mouth Muffle Face Dust Mask 100% Brand New and High Quality Dustproof Mouth muffle with Filter Dust Mask Unisex Mouth Mask Non woven PM2.5 N95 Anti dust Medical Nonwoven Folding Face MaskIts registered capital is RMB 5 million.Company tenetgather strength, create brilliance!The company is a member of the Chinese textile association, which has obtained the eu CE certification, the international iso9001:2000 quality and environment system certification, passed the NELSON test of the American institute of occupational safety and

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METHODS Nine masks claiming protection against fine PM (PM2.5) were purchased from consumer outlets in Beijing. The masks' filtration efficiency was tested by drawing airborne diesel exhaust through a section of the material and measuring the PM2.5 and black carbon (BC) concentrations upstream and downstream of the filtering medium.Blueair FaceOne Go Blueair Select Market BlueairBlueair FaceOneTM Go High performance protection, filtering over 95% of PM 2.5, pollen, dust and industrial emissions. Natural cotton for better comfort Water absorbent inside, water repellent outsideCompany Overview face mask, dust maskAs one of the first manufacturers that are qualified to produce PM2.5 masks in China, we have now five production lines for PM2.5 masks. In 2013, we founded our branch company Tongcheng Chaoxia Labor Protection Articles , whose main products are N95 folded masks, cup shape masks, anti dust and anti poison masks and gauze masks, etc.

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