In open and ventilated places in non-epidemic areas, it is not necessary to wear a mask: 1. When entering crowded or confined public places, it is necessary to wear a mask. 2. In open and ventilated places in areas with a high incidence of epidemics, it is recommended to wear a disposable medical mask; when entering crowded or confined public places, wear a surgical medical mask or a particulate matter protective mask. 3. 4.Cotton gauze masks, sponge masks and activated carbon masks have no protective effect against viral infections. 5.Masks worn by healthy people should be replaced when they are deformed, wet or dirty, resulting in reduced protective performance, and should be disposed of according to the requirements of household garbage classification. 6.Masks worn by suspected cases or confirmed patients should not be discarded at will, and should be treated as medical waste and disposed of strictly according to the They should be treated as medical waste and handled in strict accordance with the relevant medical waste process and should not enter the circulation market.