• New York (09%)
• Washington (07%)
• London (05%)
• Beijing (04%)
• Gaza (04%)
• San Francisco (03%)
• Damascus (03%)
• Manila (02%)
• Seattle (02%)
• Rome (02%)
• Jerusalem (02%)
• San Diego (02%)
• Vatican (02%)
• Sydney (02%)
• Delhi (02%)
• Athens (01%)
• Milan (01%)
• Bangkok (01%)
• Canberra (01%)
• Durban (01%)

• View Archive (2011)

• New York (17%)
• San Diego (17%)
• Portland (17%)
• Houston (17%)
• Washington (17%)
• Philadelphia (17%)

• (2) MSNBC News Cough ... the 20 most polluted cities in America

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