More than 80% of people living in urban areas that monitor air pollution are exposed to air quality levels that exceed WHO limits. While all regions of the world are affected, populations in low-income cities are the most impacted. According to the urban air quality database, 98% of cities in low- and middle income countries with more than 100 000 inhabitants, do not meet WHO air quality guidelines.
From: http://redirect.viglink.com?u=http%3A%2F%2Fwww.who.int%2Fentity%2Fmediacentre%2Fnews%2Freleases%2F2016%2Fair-pollution-rising%2Fen%2Findex.html&key=ddaed8f51db7bb1330a6f6de768a69b8
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