People asked to wear face masks in public to contain pneumonia epidemic

A passenger wearing a mask is seen at a station in the subway line 5 in Zhengzhou, central China's Henan Province, Jan. 26, 2020. The Zhengzhou Subway has made it mandatory for passengers to wear face masks, effective from Jan. 26, an action to contain the new pneumonia epidemic. (Xinhua/Li Jianan)