The skies of Delhi-NCR and parts of Punjab and Haryana were engulfed in a thick haze on the morning of October 21, a day after Diwali. While the government-run Central Pollution Control Board (CPCB) and private air pollution monitoring agencies were on the same page in categorising the air quality as “polluted”, the readings of a major pollutant — particulate matter 2.5 (PM2.5) — by the different agencies varied, sparking a debate.

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