• Washington (10%)
• London (07%)
• New York (06%)
• Kabul (05%)
• Damascus (03%)
• San Francisco (03%)
• Tripoli (03%)
• Beijing (03%)
• Barcelona (03%)
• Roma (02%)
• Seattle (02%)
• Delhi (02%)
• Leon (02%)
• Paris (02%)
• Chicago (02%)
• Madrid (02%)
• Berlin (02%)
• Los Angeles (02%)
• Gaza (01%)
• Istanbul (01%)

• View Archive (2011)

• Honolulu (17%)
• Los Angeles (17%)
• Phoenix (17%)
• Pittsburgh (08%)
• Santa Fe (08%)
• Portland (08%)
• Sacramento (08%)
• San Francisco (08%)
• San Jose (08%)

• (1) MSNBC News Report names U.S. cities with foulest, cleanest ai...
• (1) SF Gate Air quality: Several Bay Area counties fail survey

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