SUMMARY
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The World Health Organization says outdoor air pollution causes cancer. The International Agency for Research on Cancer (IARC) classifies outdoor air pollution as a “Group 1” cause of cancer, the riskiest category on its four-step scale. The IARC says pollution exposure levels increased significantly in some parts of the world in recent years, especially in rapidly industrializing nations with large populations. 2010 data shows 223,000 lung cancer deaths worldwide are the result of air pollution. The latest findings are based on overall air quality, and on an in-depth study of thousands of medical research projects conducted around the world over decades.
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