The common standards for civil masks in China are the following 3: 1, medical surgical masks, YY0469-2011; 2, industrial dust masks, GB2626-2006/2019; 3, medical protective masks, GB19083-2010. in addition, each country and region will also promulgate their own mask standards. For example, the standards developed by the National Institute for Occupational Safety and Health (NIOSH), common models are N95, N99 masks, FFP1, FFP2, FFP3 masks that meet the EU standards. Medical surgical masks, medical protective masks, N95, FFP2 can be used in medical institutions for protection. KN95 cannot be used in medical institutions, but the general public can choose their own for epidemic protection.