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Beijing smog 5

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Two new studies find that even low levels of air pollution can be linked to both lung cancer and an increased risk of heart failure.
Air pollution-related lung cancer killed 223,000 people worldwide in 2010, the United Nations agency says.
Beijing smog 5

A tourist and her daughter wearing the masks visit the Tiananmen Square at dangerous levels of air pollution on Jan. 23, 2013 in Beijing, China.

Feng Li