Kolkata air cleaner as residents stay indoors

The ‘janata curfew’ day has contributed a lot to the city’s ambient air. All parameters of pollutants not only plunged far below the national standard, but also below the World Health Organization-recommended safe standard, which is far more stringent than our national limit. Most heartening aspect is the steep plunge of PM2.5, which is the most dangerous of the pollutants.

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