For the general public, medical surgical masks, medical protective masks, medical care masks and industrial particulate protection masks, such as N95, are available. If you can buy medical protective masks and medical surgical masks, you will be given priority. For home life and daily travel, you can choose KN95 protective masks or KN90 masks, which can also play a better protective role. In addition, cotton gauze masks, sponge masks, activated carbon masks, etc. usually have no protective effect against this new coronavirus and are not recommended for use. The key to preventing the virus is to go out as little as possible, stay out of crowded places, and pay attention to hygiene and disinfection.