Feb. 2021
At present, my country's medical masks are mainly divided into three types: medical protective masks with the highest protection level, medical surgical masks commonly used in invasive operating environments such as operating rooms, and ordinary-level disposable medical masks.
Recently, the virus has struck, and experts recommend wearing a mask when going out. Masks are divided into several categories, so what is the difference between the most common KN95 and N95 masks?
