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" '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). 'We now know that outdoor air pollution is not only a major risk to health in general, but also a leading environmental cause of cancer deaths.'
"The IARC said a panel of top experts had found 'sufficient evidence' that exposure to outdoor air pollution caused lung cancer and raised the risk of bladder cancer.
"... The predominant sources of outdoor air pollution were transport, power generation, emissions from factories and farms, and residential heating and cooking, the agency said."