Cities with low centralized treatment rate of urban domestic sewage are: Changchun, Harbin, Wuhan, Zhanjiang, Beihai, Chongqing and Lhasa; Cities with low harmless treatment rate of domestic garbage are: Harbin, Urumqi and Guiyang; Cities with zero centralized treatment rate of hazardous wastes (especially cities without centralized medical waste disposal devices) are: Beijing, Shanghai, Yantai, Lhasa, Xi and Yinchuan.