Air pollution in Tehran

An Iranian flag is seen following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A view of Milad Tower following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A general view of Tehran city following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A general view of Tehran city following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A general view of Tehran city following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A view of Milad Tower following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A view of a mosque following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A view of Tehran's traffic following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A general view of Tehran city following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A view of Milad Tower following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A general view of Tehran city following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)

A view of Milad Tower following the increase in air pollution in Tehran, Iran, December 18, 2022. Majid Asgaripour/WANA (West Asia News Agency)