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Context: Delhi remained the most polluted capital city in the world but India, on the whole, had improved its average annual PM2.5 (particulate matter) levels in 2020 than in 2019, according to a report from IQ Air.
Improvement:
Rankings:
https://www.thehindu.com/todays-paper/delhi-remains-most-polluted-capital-report/article34087609.ece
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