Interactive map of small particle air pollution in world cities

In the Guardian web site an interactive map, based on the data of the World Health Organization, is available:
http://www.theguardian.com/news/datablog/interactive/2014/may/08/exposure-air-pollution-city-map
North America has lower pollution levels than in European states, with south-eastern European countries having the highest pollutions for Europe. India, China, Mongolia, Pakistan, Afghanistan, Iran present the highest levels in the world, together with many Middle East cities.

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