20 Most Polluted Cities in the World
| January 2, 2017
Kabul, Afghanistan
On top of the violence and unrest in Kabul, the city also has to deal with extreme levels of air pollution partly due to the popularity of coal as a winter fuel source.
Experts estimate that the toxic particles are reaching up to 1000 mg per cubic meter, much higher than the 300 mg per cubic meter that is considered to be the safe threshold.
Christopher Killalea / Own Work
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