Delhi has earned the dubious tag of being India’s most polluted city, rising from rank 3 in 2019 and rank 2 last year in the worst-polluted list, as per the National Clean Air Programme (NCAP) Tracker based on annual PM2.5 levels measured by the Central Pollution Control Board.source https://timesofindia.indiatimes.com/india/delhi-indias-most-polluted-city-just-7-cleaner-in-3-years/articleshow/96892878.cms
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