The main ways of transmission of new coronavirus pneumonia are droplet transmission and contact transmission. A good way to dilute the density of the virus in the indoor environment is to open windows and ventilate the room, but it is best to ventilate the room when people are not in the room, because the weather is relatively cold, and it is easy to catch a cold if you open the windows and ventilate the room. In addition, there are also aerosols in the current mode of transmission, which may be one of the ways of transmission of the new crown, if the ventilation in the indoor environment, there is a possibility that aerosols may be formed after the wind comes, which may cause aerosol infection. Therefore, it is best to ventilate the room when people are not in the room, such as people in the living room, close the bedroom door, open the bedroom window to ventilate the bedroom for more than half an hour, and then open the window of the living room to ventilate the living room after people go to the bedroom. Source: Dr. Yurai