World's 10 Most Polluted Cities

8. Gaborone, Botswana:

Gaborone in Botswana takes the eighth position on the most polluted cities list. The city records for 219 micrograms of polluting particles per cubic meter. Gaborone is the capital and the biggest city in Botswana. It is one of the most rapidly growing cities in Africa, though, veldt fires from the dry winters and dirty second-hand vehicles are the main source of pollution in the city.

7. Peshawar, Pakistan:

Peshawar in Pakistan takes the seventh position. The city records for 219 micrograms of polluting particles per cubic meter. Peshawar is located in a valley and is the administrative center for the Federally Administered Tribal Areas of Pakistan.  Its enormous expansion and influx of migratory workers has caused a boom in urban pollution. It is also a key city from where the U.S. launches many of its strategic campaigns in Afghanistan.