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People wear masks to help guard against dangerous levels of air pollution in Tehran, Iran, Monday, Dec. 23, 2019. Poor air quality forced Iran’s government on Monday to keep all schools closed in the capital, Tehran, and other cities. Schools were closed since Saturday, and will remain closed until Wednesday, the end of the week in Iran, according to the official IRNA news agency. Tehran’s air is among the most polluted in the world. (AP Photo/Ebrahim Noroozi)

People wear masks to help guard against dangerous levels of air pollution in Tehran, Iran, Monday, Dec. 23, 2019. Poor air quality forced Iran’s government on Monday to keep all schools closed in the capital, Tehran, and other cities. Schools were closed since Saturday, and will remain closed until Wednesday, the end of the week in Iran, according to the official IRNA news agency. Tehran’s air is among the most polluted in the world. (AP Photo/Ebrahim Noroozi)

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