Iran’s Escalating Air Pollution Crisis

On September 26, 2025, the Swiss air quality technology company IQAir ranked Tehran as the most polluted city in the world. A day later, the Iranian capital—along with several other major cities—experienced their most polluted days of the year. Air quality indices in parts of Tehran surpassed the “very unhealthy” threshold, while Mashhad, Isfahan, Urmia, Tabriz, Qom, and several […]

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