20 Most Polluted Cities in the World
| January 2, 2017
Mexico City, Mexico
Air quality in Mexico City reached a 14 year low earlier in 2016, mostly due to out of date models of vehicles that are not held to the same emissions standards that other countries might have. City officials even placed a ban on 40% of the city’s vehicles in an attempt to quell the pollution that kills approximately 2,700 citizens a year.
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