During the pandemic-induced lockdown period, PM 2.5 levels across six major Indian cities – Delhi, Mumbai, Kolkata, Chennai, Hyderabad and Bengaluru – dropped a phenomenal 45-88 per cent. The drop in Delhi-NCR was of about 66-79 per cent. However, with the nation opening up in lockdown 4, pollution has started registering a comeback. In the six cities, there was a two-six times increase in PM 2.5 levels during lockdown 4; Delhi-NCR saw has seen a more significant rise of four-eight times.
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