When you are in indoor crowded places such as shopping malls, supermarkets, cinemas, venues, exhibition halls, airports, docks and common areas of hotels; when you ride in compartment elevators and public transportation such as airplanes, trains, boats, coaches, subways and buses; when you are in crowded outdoor places such as open squares, theaters and parks; when you are in hospitals for medical consultation or escorting, when you receive temperature tests, check health codes and register trip information You should wear a mask when you are having nasopharyngeal discomfort, coughing, sneezing and fever; and when you are not eating in a restaurant or canteen.