The United Nations' International Agency for Research on Cancer announced last week that both outdoor air pollution and one of its major components, particulate matter, would be classified as Group 1 human carcinogens. Air pollution was linked to 223,000 lung cancer deaths across the world in 2010, and strong evidence suggests it is also tied to increased bladder cancer risk, according to the agency. The designation of air pollution as carcinogenic to humans was vital in raising governmental awareness of its dangers and possible costs, IARC Director Christopher Wild said.

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