这也是为什么医用和非医用的不同同样都是N95，医用标准和非医用的filter是不同的 “Masks can filter particles as small as 0.007 microns – 10 times smaller than viruses, and much, much smaller than PM2.5. What’s more, they work surprisingly well, even while people are wearing them. Surgical masks are perform less well cheap but are cheaper and more readily available. Get the latest clean air tips!” https://smartairfilters.com/en/blog/coronavirus-pollution-masks-n95-surgical-mask/?__cf_chl_jschl_tk__=9b60753eed487fd4154bf9f34fdf65aaac09759d-1586752523-0-AUbRUxSDu4ePYkBzUrkVbTbWkcBFyGqTF9MKn2cYPMHSuvaMCezvDmqKJLk63Yuv6ltAef3e1pjb0z11H2dN23DM74I1qTKEr_r8WSxCdeODIGvynm_rPd42-aFxtW_McGgqtIhBDl1Gt5JBB82tgwMoy1dDPAGBkpthVCtzPIHZO5DY8JaNPp4O-4SHLO5aXm02UoFQ6Pk9Dig-x9ByJfBib3UA3bHWG70WuifypNV1yhNTWPSdDitETqMO-JLAi9yiFxs-AjkrBLf-vWj2tETvYr7sTRO4riGaiOLV9UmYfSEpttFTCC4vZmlAAsPRq8wNLCCS5XZvuEcN4bGg0TMzryim1EOLKl2aUlKiKnfu Surgical N95 respirators are designed to reduce but cannot eliminate the wearer’s exposure to airbor (more...)