1, as far as possible to choose professional anti-haze mask, do not buy chemical fiber masks. The mask should be changed once in 2 hours as far as possible, and should not be used for more than 4 hours at a time, and can be washed several times. If it is a single-use mask, wear it for no more than 6 hours. 2. Avoid outdoor sports, close doors and windows; wash your face, hands and mouth after coming back from outdoors to avoid particulate matter from entering the respiratory tract and causing diseases. 3.Eat more food such as fungus and tomatoes.