Smog a Medellín

A giant mask is seen on the sculpture by Colombian artist Fernando Botero called "Cabeza" after it was put as a symbolic demonstration against air contamination, in Medellin, Antioquia department, Colombia, on April 8, 2016. City authorities declared an environmental emergency due to high leves of pollution. / AFP / RAUL ARBOLEDA (Photo credit should read RAUL ARBOLEDA/AFP/Getty Images)

A giant mask is seen on the sculpture by Colombian artist Fernando Botero called "Cabeza" after it was put as a symbolic demonstration against air contamination, in Medellin, Antioquia department, Colombia, on April 8, 2016. City authorities declared an environmental emergency due to high leves of pollution. / AFP / RAUL ARBOLEDA (Photo credit should read RAUL ARBOLEDA/AFP/Getty Images)

A giant mask is seen on the sculpture by Colombian artist Fernando Botero called "Cabeza" after it was put as a symbolic demonstration against air contamination, in Medellin, Antioquia department, Colombia, on April 8, 2016. City authorities declared an environmental emergency due to high leves of pollution. / AFP / RAUL ARBOLEDA (Photo credit should read RAUL ARBOLEDA/AFP/Getty Images)

A giant mask is seen on the sculpture by Colombian artist Fernando Botero called "Cabeza" after it was put as a symbolic demonstration against air contamination, in Medellin, Antioquia department, Colombia, on April 8, 2016. City authorities declared an environmental emergency due to high leves of pollution. / AFP / RAUL ARBOLEDA (Photo credit should read RAUL ARBOLEDA/AFP/Getty Images)

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