If I am healthy, I can avoid wearing a mask at home, in places with good ventilation or low density of people, as follows: 1.No suspected patients, close contacts or people returning home from infected areas at home, you can avoid wearing a mask at home; 2.Working in the open air in places with good ventilation and keeping appropriate distance from adjacent people; 3.When going out, there is no crowd gathering, and those who are in a position to do so keep appropriate distance from people around them 4, the office strictly take clean and necessary preventive disinfection, temperature measurement, ventilation measures. At the same time, if there is no history of living in the infected areas such as Hubei and Wenzhou, no suspected and close contacts, and if a safe distance of one meter or more is maintained, the mask can also not be worn.