Rooftops are seen, shrouded in polluted air in Tehran, Iran, Wednesday, Dec. 1, 2010. Heavy air pollution has forced Iranian authorities to close government offices and declare a two-day public ... more 
Rooftops are seen, shrouded in polluted air in Tehran, Iran, Wednesday, Dec. 1, 2010. Heavy air pollution has forced Iranian authorities to close government offices and declare a two-day public holiday in the capital, Tehran. less 
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Associated Press | Photo By Vahid Salemi
Thu, Dec 2, 2010 12:32 PM EST