1,Always wear a mask when you are in close proximity to others, such as on public transportation, the subway, or airplanes. Because close contact is easy to be infected with new coronary pneumonia.

2, When going to a public, enclosed environment, you must wear a mask, because the virus can form aerosols to spread in the uncirculated air, leading to infection.

3, wear a mask when you go to the hospital. The hospital is a mixed personnel place, it is easy to cross infection, so it is safer to wear a mask.

4, some of the weaker people as well as the elderly go out to try to wear a mask, because the weak and elderly, the relative resistance is lower, it is easy to be infected.