The N95 mask is one of nine particulate protective masks certified by NIOSH (National Institute for Occupational Safety and Health). The N95 mask is not a specific product name. As long as it meets the N95 standard and passes the NIOSH review, it can be called a N95 mask. The N95 mask can be used for particles with an aerodynamic diameter of 0.24 ± 0.6 μm (physical diameter 0.075 μm ± 0.020 μm). The filtration efficiency reaches over 95%.