What are the 20 cities with the worst environment in China?

The 10 cities with the largest air pollution index and the heaviest air pollution are Linfen, Yangquan, Datong, Shizuishan, Sanmenxia, Jinchang, Shijiazhuang, Xianyang, Zhuzhou and Luoyang. Urban sewage centralized treatment rate of low cities are: Changchun, Harbin, Wuhan, Zhanjiang, Beihai, Chongqing, Lhasa; harmless treatment of domestic waste is relatively low in the city are: Harbin, Urumqi, Guiyang; hazardous waste centralized treatment rate of zero (specifically referred to the centralized disposal of medical waste has not yet been built) of the city are: Beijing, Shanghai, Yantai, Lhasa, Xi'an, Yinchuan.