1. Medical protective masks (N95)>Medical surgical masks>Disposable medical masks. Medical surgical masks can block 70% of bacteria, N95 masks can block 95% of bacteria, and cotton masks can only block 36% of bacteria. Therefore, to prevent the new crown, we must choose the first two masks. Moreover, the protective effect of n95 masks is better than that of medical surgical masks.

2. It is not to say that medical surgical masks are useless. For the general population, medical surgical masks are sufficient for daily protection. N95 masks are generally used by frontline medical staff. N95 masks are more expensive than medical surgical masks.

3. The N95 mask is one of the nine particulate protective masks certified by NIOSH. It can filter particles with aerodynamic diameter and physical diameter of 0.075μm±0.020μm with a filtration efficiency of more than 95%; while medical shell masks consist of face masks, Shaped parts, straps and other components are processed, generally made of non-woven materials. Isolate by filtering.