Air pollution is killing an average of 4,000 people a day in China,
according to researchers who cited coal-burning as the likely principal cause.
(Photographer: Tomohiro Ohsumi / Bloomberg)
A study found that China's export industry is responsible for pollution
that blows across the Pacific Ocean and contributes to smog in the United States.
(Peter Parks / AFP/Getty Images)
(Photo by Kevin Frayer/Getty Images)
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