Protective masks are divided into 3 standards: 1, N95, according to the U.S. standard NIOSH production; 2, FFP2, for the European standard EN149; 3, KN95, for the Chinese standard GB2626-2006, all masks printed with the implementation of standards are qualified masks, medical N95 masks need to prevent high-pressure liquid splash, so the standard is higher than the ordinary N95. Take 3M for example, 1860 and 9132 type are the most commonly used medical protective masks, there is also a children’s version of 1860S. Ordinary people or medical personnel do not come into contact with high-pressure liquid splash, you can choose ordinary N95 masks that meet the standard, try not to touch after wearing the mask, if you need to touch please wash your hands before and after touching, try not to touch the outside of the mask when you take it off, wash your hands immediately after taking it off, disposable medical masks should not be used repeatedly.