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Air quality was “severe” for a third consecutive day in the city on Monday, making it the second most polluted city in the world, behind Lahore in Pakistan, according to a real-time compilation by Swiss group IQAir.
Source: https://www.newdelhitimes.com/new-delhi-to-restrict-use-of-vehicles-to-curb-air-pollution/
The gold standard of air pollution research is the IQAir survey.
Source: https://247wallst.com/economy/2023/03/16/americas-most-polluted-city/