Feng Luzhao pointed out that the following two situations can not wear masks.
First, there is no need to wear masks in outdoor areas, such as parks and streets with few people, including the playground. Especially when you are exercising hard, you cant wear a mask.
Second, in low-risk areas where no new cases have been reported recently, in fact, we do not need to wear masks when we can maintain ventilation conditions and relatively safe social distance in offices, meeting rooms, construction sites and schools.
First, it is recommended to wear masks in some closed public places, such as public transportation vehicles, elevators and public places with many people. As mentioned earlier, people with unknown infection may be contacted.
Second, when people are ill, especially if they have fever or cough or respiratory tract infection, they should wear masks. This is mainly to avoid passing these diseases on to other people. This is not only during the epidemic, but also at any time in the future. People who are ill should wear masks.