The smog-guzzling buildings fighting deadly pollution

May 24, 2014 1:22 PM

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The smog-guzzling buildings fighting deadly pollution

Vital Signs is a monthly program bringing viewers health stories from around the world.

(CNN) -- Air pollution is now the biggest global environmental killer, the WHO has confirmed. The seven million deaths it caused in 2012 exceeded the victims of cigarettes, and is more than double previous estimates.

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