Residential buildings are obscured by heavy air pollution in Cairo, Egypt Wednesday, Jan. 16, 2013. Cairo has air pollution levels from 10 to 100 times higher than the World Health Organization standards. High vehicle fuel emissions, polluting urban industries, and a hot and dry desert climate are causing havoc to the occupants of this city. (AP Photo/Khalil Hamra)

Associated Press
Residential buildings are obscured by heavy air pollution in Cairo, Egypt Wednesday, Jan. 16, 2013. Cairo has air pollution levels from 10 to 100 times higher than the World Health Organization standards. High vehicle fuel emissions, polluting urban industries, and a hot and dry desert climate are causing havoc to the occupants of this city. (AP Photo/Khalil Hamra)
Residential buildings are obscured by heavy air pollution in Cairo, Egypt Wednesday, Jan. 16, 2013. Cairo has air pollution levels from 10 to 100 times higher than the World Health Organization standards. High vehicle fuel emissions, polluting urban industries, and a hot and dry desert climate are causing havoc to the occupants of this city. (AP Photo/Khalil Hamra)
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