As many as 14 Indian cities have been included in the list of world's top 20 most polluted cities by IQAir, which ranked Pakistan's Lahore as the world's most polluted city. The Indian cities in the top 20 are Bhiwadi, Delhi, Darbhanga, Asopur, Patna, Ghaziabad, Dharuhera, Chhapra, Muzaffarnagar, Greater Noida, Bahadurgarh, Faridabad and Muzaffarpur.