
Recognise Kolkata’s deteriorating air quality as a public health emergency: PIL petition in Calcutta High Court
On the evening of December 11, 2025, Kolkata recorded an AQI peak of 439 and the AQI surged to an alarming 558 at around 11.04 pm, placing the city firmly in the "severe" or "hazardous" category and surpassing Delhi's worst readings during the same timeframe, according to the petition.













