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Outdoor air pollution a leading cause of cancer: WHO

Diesel exhaust has been classified as carcinogenic by the World Health Organization's International Agency for Research on Cancer (IARC)The World Health Organization (WHO) on Thursday classified outdoor air pollution as a leading cause of cancer in humans. "The air we breathe has become polluted with a mixture of cancer-causing substances," said Kurt Straif of the WHO's International Agency for Research on Cancer (IARC).