Disposable masks are not necessary to wear throughout the day, depending on the situation, as follows: 1, the new coronavirus pneumonia period: wear masks to prevent infection of respiratory transmission of a variety of infectious diseases, such as tuberculosis, the new coronavirus pneumonia and so on. Especially in the epidemic period of new coronavirus pneumonia, wearing a surgical mask can effectively prevent infection and morbidity, but there is no need to wear all day. 2, cardiopulmonary diseases in the elderly: a specific analysis of the environment, selective wear, long-term wear may have the risk of skin allergies, but also affect the respiratory, especially for the elderly with cardiopulmonary underlying diseases. 3, public places as well as hospitals: usually in public places or crowded crowded environment need to wear masks, and pay attention to maintain the distance between people, medical staff into the new coronavirus pneumonia patients in the hospital room or clinic need to wear N95 masks, at the same time to pay attention to the secondary or tertiary protection, wear a face screen or goggles, in order to improve the level of protection. 4, the open environment or at home: there is no need to wear masks in patients who do not have fever or pneumonia, and the home should be noted that Open windows frequently for ventilation.