• London (08%)
• Washington (08%)
• Barcelona (05%)
• Birmingham (05%)
• Seattle (05%)
• New York (03%)
• Delhi (03%)
• Karachi (03%)
• Gaza (02%)
• Damascus (02%)
• Paris (02%)
• Madrid (02%)
• San Francisco (02%)
• Hong Kong (01%)
• Victoria (01%)
• Cairo (01%)
• Beijing (01%)
• Miami (01%)
• Tripoli (01%)
• Abidjan (01%)

• View Archive (2011)

• Phoenix (09%)
• Houston (09%)
• Los Angeles (09%)
• San Diego (09%)
• Charlotte (09%)
• Sacramento (09%)
• Fresno (09%)
• Birmingham (09%)
• Salt Lake City (09%)
• Pittsburgh (09%)

• (1) Forbes List: America's Most Polluted Cities

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