Outdoor air pollution was recently classified as carcinogenic to humans by the specialized cancer agency of the World Health Organization, the International Agency for Research on Cancer (IARC). According to the press release, The IARC evaluation showed an increasing risk of lung cancer with increasing levels of exposure to particulate matter and air pollution. Although the composition of air pollution and levels of exposure can vary dramatically between locations, the conclusions of the Working Group apply to all regions of the world. As stated in 2010, 223 000 deaths from lung cancer worldwide resulted from air pollution and the predominant sources of outdoor air pollution are transportation, stationary power generation, industrial and agricultural emissions, and residential heating and cooking.
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