(PD) Photo: Dr. Edwin P. Ewing, Jr. / Centers for Disease Control and Prevention (CDC) Smog in New York, 1988
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(CC) Photo: Rick Kimpel Smog in Denver, 2006
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(CC) Photo: Carol Sawada Smog in Sao Paulo, Brazil, 2006
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(CC) Photo: Jim Budd Smog in London, 2007
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(PD) Photo: Jon Sullivan, www.pdphoto.org Smog in Los Angeles, 2003
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(CC) Photo: Brian Jeffrey Beggerly Smog in Beijing, 2005
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(CC) Photo: Andrea Squatrito Smog in Milan, italy, 2006
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(CC) Photo: Yulia Smirnova Smog in Moscow, 2010
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(CC) Photo: Lauren Brown Smog in Mexico City, 2006
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(CC) Photo: Thomas Galvez Smog in Kuala Lumpur, Malaysia, 2006
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