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The PM2.5 surgical mask performed similarly, with 22% TIL. The N95-equiv. mask was perceived to provide the best protection, but was also perceived as being uncomfortable and more difficult to

(PDF) Effectiveness of face masks used to protect Beijing

The PM2.5 surgical mask performed similarly, with 22% TIL. The N95-equiv. mask was perceived to provide the best protection, but was also perceived as being uncomfortable and more difficult to 3m face mask Manufacturers & Suppliers, China 3m face mask 3m face mask manufacturer/supplier, China 3m face mask manufacturer & factory list, find qualified Chinese 3m face mask manufacturers, suppliers, factories, exporters &

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