Chongqing, Chongqing Municipality, China

According to the National Environmental Analysis released by Tsinghua University and the Asian Development Bank in January 2013, Chongqing is among one of the ten most air-polluted cities in the world. Also according to this report, seven of the ten most air-polluted cities are in China, including Taiyuan, Beijing, Urumqi, Lanzhou, Chongqing, Jinan and Shijiazhuang.
Administrative divisions
Chongqing is the largest of the four direct-controlled municipalities of the People's Republic of China. The municipality is divided into 38 subdivisions (3 were abolished in 1997, and Wansheng and Shuangqiao districts were abolished in October 2011), consisting of 21 districts, 13 counties, and 4 autonomous counties. The boundaries of Chongqing municipality reach much farther into the city's hinterland than the boundaries of the other three provincial level municipalities (Beijing, Shanghai and Tianjin), and much of its administrative area, which spans over 80,000 square kilometres (30,900 sq mi), is rural.