It is not true that medical masks cannot protect against the new coronavirus. Usually, the new coronavirus is mainly transmitted through respiratory droplets and close contact. The actual diameter of human droplets is more than 5 microns, and medical masks have filters in the middle, which can effectively prevent droplets with the new coronavirus from entering the human respiratory tract and causing infections. If you use other non-medical masks in your daily life, they may not be able to prevent the new coronavirus from entering the human respiratory tract, such as cotton masks, sponge masks, activated charcoal masks, etc. Because the material of these masks is not fine enough, they may not be able to prevent the new coronavirus from entering the human respiratory tract. Because these masks are not made of fine enough materials and do not have filters, and the gaps in the masks are larger than those of medical masks. Daily travel need to wear a good medical mask, which can effectively reduce the chances of new coronavirus infection, but also can isolate other viruses transmitted by the droplet route, which is conducive to the health of the body.