Delhi becomes world's most polluted city

Delhi became the world's most polluted city on Saturday, according to Swiss company IQAir's data. The city's AQI between 11 am and 12 noon was recorded at 483. It was followed by Lahore (216), Kolkata (180), Dhaka (165) and Birmingham and Almaty (157). Mumbai took the seventh spot on the list, as AQI was recorded at 156.