Study: Air pollution is a big problem for city dwellers

05/8/2014 | Wire, The

Just 12% of the global population lives in cities with acceptable air quality, and half of all urbanites are subjected to air pollution levels more than 2.5 times the recommended threshold, according to a new study from the World Health Organization. Mexico City, Karachi and Delhi are among the worst offenders, and researchers also found poor air quality in the U.S. and in European metropolises such as Paris and London.

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