Chennai, Bengaluru and Mumbai turned out to be among the best three cities in terms of having clean air during the first 40 days of the coronavirus-triggered lockdown, shows an analysis of the Central Pollution Control Board (CPCB), released on Wednesday.
source https://timesofindia.indiatimes.com/india/chennai-bengaluru-had-cleanest-air-in-lockdown/articleshow/78286550.cms
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