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Ahvaz, a city in southwest Iran, is the world’s most polluted city, with the highest measured level of airborne particles smaller than 10 micrometers, according to a global survey of reported data by the World Health Organization, the Financial Times reported.

Ahvaz had an annual average of 372 micrograms of such particles per cubic meter, followed by Ulan Bator, the capital of Mongolia, with 279 micrograms and another Iranian city, Sanandaj, with 254; cities in Pakistan and India, such as Quetta and Kanpur, were high on the list, as was Gaborone, the capital of Botswana, the newspaper said.