Zabol, Iran #1
Global Citizen
The Zabol area, with summer temperatures exceeding 100 F, is well known for its “120-day winds”, a persistent summer dust storm. The disappearance in the 2000s of the nearby Hamoun wetlands has exacerbated the dusty conditions in Zabol, leading the World Health Organization to name Zabol the most polluted city in the world. A study in Preventive Medicine suggested that the harm from 30 minutes of cycling outdoors in Zabol’s polluted air would outweigh the benefits of the exercise.
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