How long do you wear N95 masks at a time?
Various places are looting masks, manufacturers work overtime to produce, and dispose of masks after use. In the face of this epidemic of fighting coronavirus pneumonia, " N95 masks " have become a sensitive word affecting social nerves. What is the N95 mask that everyone seeks? N95 is not a specific product name, but a standard. Products reviewed by the National Institute of Occupational Safety and Health (NIOSH) can be called " N95 masks ." "N" means not resistant to oil, "95" means that under the specified number of special test particles, the particle concentration inside the mask is more than 95% lower than the particle concentration outside the mask. The protection level of N95 means that under the testing conditions specified in the NIOSH standard, the filtering efficiency of the mask filter material to non-oily particles (such as dust, acid mist, paint mist, microorganisms, etc.) reaches 95%. The N95 mask is one of the nine partic...