| 1 | Linfen, China: The most polluted city on earth. | |
| 2 | Hang out laundry in Linfen and it will turn black before drying, according to Mother Nature Network. | |
| 3 | Sixteen of the world's 20 dirtiest cities are located in the People's Republic, including the worst, Linfen, a coal-mining center in Shanxi province. | |
| 4 | In 2006, the World Bank dubbed Linfen the most polluted city in the world. | |
| 5 | Iron foundries, smelting plants, and cement factories loomed in and out of the haze as I traveled along the roads leading into Linfen. |
