Cambridge Mask, after N99 testing, instead of the next level of N95, uses a unique three-layer filtration system to filter out dust, PM10, PM2.5, and PM0.3 contamination particles as well as bacteria and viruses. Cambridge Mask is a major protective face mask brand that markets products and services at us.cambridgemask.com. Cambridge Mask sells mid-range purchase size items on its own website and partner sites in the highly competitive online protective face masks industry.
