Smog
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Trees are saving human lives - 850 people per year - by reducing air pollution
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WHO lists most polluted countries: Delhi air worst
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List of U.S. cities with worst air pollution released: Is your city poisoning you?
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Storms in America Fueled by Air Pollution in Asia?
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Greenland ice cores speak volumes about climate change problems
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Proof of success of U.S. Clean Air Act shows up in Greenland ice
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Paris now greeting tourists with smog (Beijing, you've got competition)
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Will air clear with new sulfur regulations?
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Orange level smog alert in Beijing triggers spike in sale of air purifiers
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With orange alert, Beijing finally taking smog problem seriously
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