“New Delhi, May 9: Prolonged exposure to poor air quality appears to increase the risk of cancer, particularly breast and prostate cancers, a study in the US has suggested, bolstering evidence for environmental links to cancer.
The study led by Jyotsna Jagai, an environmental health researcher at the University of Illinois, Chicago, has found that counties across the US with poor environmental quality had on average 39 more cases of cancer per 100,000 people than counties with high environmental quality.”  The Telegraph

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Cancer risk tied to pollution in environment