Delhi is the most polluted city in the world today
Mumbai and Kolkata also feature on the list of the world's most polluted cities. While Lahore, Pakistan, is number 2, China's Chengdu is at no 3
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Mumbai and Kolkata also feature on the list of the world's most polluted cities. While Lahore, Pakistan, is number 2, China's Chengdu is at no 3
