A blanket of smog covering Mexico City in 2010 (Image by Usfirstgov).

By Allston Mitchell, April 4, 2016

A blanket of smog covering Mexico City in 2010 (Image by Usfirstgov).

A blanket of smog covering Mexico City in 2010 (Image by Usfirstgov).

A blanket of smog covering Mexico City in 2010 (Image by Usfirstgov).

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