kn90 mask can be used to prevent new coronary pneumonia. kn90 is one of the particulate matter protective masks, for non-oil particles above 0.3μm filtration efficiency is greater than 90%, the CDC said it can be used.
The protection effect is better than disposable medical masks and medical surgical masks. Droplet nuclei carrying viruses exist in the air as particulate matter, and the barrier ability of particulate matter protection masks is comparable to that of medical protection masks, which can be used for self-protection in crowded places. For medical personnel can be used as a supplement when the supply of medical protective masks is insufficient, but for the operating room and other areas with high humidity or the risk of splashing body fluids is not recommended.