India has 15 out of world's 20 most polluted cities
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India has once again performed poorly in the World Air Quality Report. According to the Swiss air quality technology company IQAir, 15 Indian cities are among the top 20 most polluted cities in the world. Bhiwadi in Rajasthan was ranked third, while Delhi was ranked fourth. The city of Lahore in Pakistan topped the list, followed by Hotan, China, at number two.