As per live rankings by IQAir on Tuesday, Pakistan's Lahore is the world's most polluted city followed by Delhi, Senegal's Dakar, Democratic Republic of the Congo's Kinshasa and Bangladesh's Dhaka. Other cities in the top 10 are Mongolia's Ulaanbaatar, Vietnam's Hanoi, Indonesia's Jakarta, Kolkata and Romania's Bucharest. Mumbai is ranked 21st on the list on Tuesday.