Take a look at some of the world's most polluted cities, as ranked and compiled by Time, the Blacksmith Institute and ABC Environment.
2 / 14
Linfen, China -- One of China's most polluted cities, Linfen sits in the heart of the country's coal belt. The hills are dotted with mines, both legal and illegal, and the air is filled with burning coal. Hanging laundry is known to turn black before it dries.