Earth's most polluted cities

This is the list of the dirtiest cities on the planet. First place goes to Linfen, located within China's coal belt. So polluted is the city that, according to reports, laundry hung to dry ends up black even before it finishes drying. A day spent in Linfen is equivalent to smoking three packs of cigs!

But if you think that pollution is a problem in poor and developing nations, think again. Guess which city got the second place. Los Angeles, USA, the city with the most polluted ozone! And it's interesting that in this list are included affluent places such as London in the UK and Phoenix, USA.

It's now time for these nations to take action.