World health organization

2011 in review: key health issues

Black soot produced by burning refinery by-products at a petrochemical complex south of Lyon, France

Over two million people die each year from particles found in air pollution

Air pollution (both indoor and outdoor) can threaten people's health in many cities, according to a compilation of WHO data on air quality. The information includes data on the air quality from nearly 1100 cities in 91 countries, including national capitals and cities with more than 100 000 residents.

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