Iranian oil technician Majid Afshari checks the oil separator facilities in Azadegan oil field, near Ahvaz, Iran, in 2008. Cities in Iran, India, Pakistan and the capital of Mongolia rank among the worst on the planet for air pollution, while those in the U.S. and Canada are among the best, according to the first global survey, released Monday, Sept. 26, 2011, by the World Health Organization. The southwest Iranian city of Ahvaz walked away with the unfortunate distinction of having the highest measured level of airborne particles smaller than 10 micrometers. (AP Photo/Vahid Salemi, File)
Read the article: Air pollution: U.S., Canada cities among best; Iran, India, Pakistan cities worst
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