The new coronavirus pneumonia epidemic is not recommended to wear black masks, black masks on the market mostly because of the factor of adding activated carbon, activated carbon added after the mask is presented as black. Activated carbon masks, mostly used for odor control, dust control and irritating taste, can be used in chemical factories, leather factories, daily dust control, etc., but they have no effect on the blocking of new coronavirus pneumonia. At present, according to different people, scenarios and the degree of danger, in order to cut off the respiratory droplet transmission route of the new coronavirus, it is recommended to choose to wear disposable medical protective masks, medical surgical masks, N95 or KN95 masks.