Fact: Iran has 4 of the 10 cities with worst air pollution, with Arabistan Alahwaz being number 1

Ahwaz in southwestern Iran has the world's worst air pollution, according to data released by the World Health Organization (WHO). The oil refineries and steel factories around the Iranian city contribute to airborne particulate levels averaging 15 times that of Los Angeles and 3 times that of Beijing.

Among the ten cities with the most polluted air, Ahwaz is joined by three others in Iran:

1. Ahwaz city, Arabistan Al Ahwaz
2. Ulaanbaatar, Mongolia
3. Sanandaj, Iran
4. Ludhiana, India
5. Quetta, Pakistan
6. Kermanshah, Iran
7. Peshawar, Pakistan
8. Gaborone, Botswana
9. Yasouj, Iran
10. Kanpur, India