Photo taken on Nov. 14, 2016 shows a view of smog-enveloped Tehran, Iran. Iran's government announced that all schools and kindergartens of Tehran close on Nov. 14 and 15, due to heavy air pollution in the city. (Xinhua/Ahmad Halabisaz)
Photo taken on Nov. 14, 2016 shows a view of smog-enveloped Tehran, Iran. Iran's government announced that all schools and kindergartens of Tehran close on Nov. 14 and 15, due to heavy air pollution in the city. (Xinhua/Ahmad Halabisaz)