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View from Tlanepantla of Mexico City blanketed by smog on March 18, 2016. Mexican officials lifted a four-day air pollution alert in the nation's densely-populated capital after ozone levels dropped, according to them, to acceptable levels. Mexico City authorities issued the first air pollution alert in 14 years due to high ozone levels, restricting traffic, encouraging children to stay indoors and ordering factories to cut emissions. AFP PHOTO / RONALDO SCHEMIDT / AFP / RONALDO SCHEMIDT        (Photo credit should read RONALDO SCHEMIDT/AFP/Getty Images)
View from Tlanepantla of Mexico City blanketed by smog on March 18, 2016. Mexican officials lifted a four-day air pollution alert in the nation's densely-populated capital after ozone levels dropped, according to them, to acceptable levels. Mexico City authorities issued the first air pollution alert in 14 years due to high ozone levels, restricting traffic, encouraging children to stay indoors and ordering factories to cut emissions. AFP PHOTO / RONALDO SCHEMIDT / AFP / RONALDO SCHEMIDT        (Photo credit should read RONALDO SCHEMIDT/AFP/Getty Images)

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    El temor a respirar el aire de la Ciudad de México

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El temor a respirar el aire de la Ciudad de México

La Ciudad de México declaró una contingencia ambiental durante tres días debido a la mala calidad del aire; sus habitantes resienten los efectos de respirar los gases contaminantes de la ciudad.

El temor a respirar el aire de la Ciudad de México

La Ciudad de México declaró una contingencia ambiental durante tres días debido a la mala calidad del aire; sus habitantes resienten los efectos de respirar los gases contaminantes de la ciudad.