Not all masks can protect against the new coronavirus. Generally, the correct wearing of disposable surgical masks, masks that meet the N95 or KN95 standards, etc. can protect against the new coronavirus. The infectious pathways of the new coronavirus mainly include air droplets, aerosols, contact, etc. Wearing masks correctly can prevent some of the new coronaviruses. In the new coronavirus prevention and control program, it is clearly mentioned that disposable surgical masks can be used to prevent new coronavirus infection, and masks that meet the N95 or KN95 standards can also be used to prevent infection. Other masks such as gauze masks do not have the function of protection against novel coronavirus. It is recommended to wear disposable medical surgical masks, the effective time is usually 4 hours, and should be replaced in time.N95 or KN95 standard masks are more expensive, and can be used if you have the conditions.