• Washington (07%)
• London (06%)
• Beijing (04%)
• Shanghai (04%)
• New York (04%)
• Mexico City (03%)
• Hong Kong (03%)
• Delhi (03%)
• Gaza (03%)
• Singapore (03%)
• Islamabad (02%)
• Baghdad (02%)
• Seattle (02%)
• Paris (02%)
• Barcelona (02%)
• Los Angeles (02%)
• Moscow (01%)
• Pyongyang (01%)
• Cairo (01%)
• New Delhi (01%)

• View Archive (2009)

• Dallas (11%)
• Houston (11%)
• Los Angeles (11%)
• Phoenix (11%)
• Washington (11%)
• Birmingham (11%)
• Pittsburgh (11%)
• Cincinnati (11%)
• Fresno (11%)

• (1) Forbes America's Most Polluted Cities

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