Most N95 masks are also consumables. When used to prevent infectious diseases caused by viruses, bacteria, fungi and other pathogens spreading in the air, N95 masks are not recommended to be used for a long time, otherwise the pathogens may gather on the surface of the mask. Pollution masks have greatly reduced its ability to prevent and control it.
Therefore, it is generally recommended to wear the mask for more than 4 hours and replace it in time. If the mask is damaged or wet, it should be replaced in time. Otherwise, microorganisms can penetrate into the inner surface, which causes bacteria on the inner surface of the mask to exceed the standard and does not provide good defense effect.