Air Pollution as bad as asbestos or cigarettes: United Nations World Health Organization says: more reason to plant more street trees!
http://www.thestar.com/news/world/2013/10/17/air_pollution_as_bad_as_asbestos_cigarettes_as_cause_of_cancer_says_un.html
http://www.thestar.com/news/world/2013/10/17/air_pollution_as_bad_as_asbestos_cigarettes_as_cause_of_cancer_says_un.html
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