Vietnam is listed amongst the top ten countries with the worst air pollution in the world, according to the 2012 Environmental Performance Index (EPI) released during this year's World Economic Forum in Davos, Switzerland.
The annual study uses satellite data to measure air pollution concentrations and has been produced by researchers at Yale and Columbia universities.
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http://www.asianewsnet.net/home/news.php?id=27481
http://veryvietnam.com/2012-02-08/vi...air-pollution/
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