Heavy industry in BaoTou

First one picture from Google Earth: heavy industry in BaoTou, a megacity in Inner Mongolia Autonomous Region, China. (2007-02-27)

And then two pictures taken in the flight from Beijing to Urumqi. (2007-01-21)

This is a aerial photograph of city BaoTou. You can see the heavy industry area as a black surface in the north west corner of the city. (http://en.wikipedia.org/wiki/Baotou)