Delhi's air quality slipped into the "very poor" category on Sunday. The city recorded an Air Quality Index (AQI) of 315, deteriorating from 292 on October 25, according to data from the Central Pollution Control Board (CPCB).

Despite an overall improvement, air pollution remained severe in certain areas. Anand Vihar recorded an AQI of 421, placing it in the “severe” category. Across the city, 29 monitoring stations continued to report “very poor” air quality, with AQI readings above 300.

The CPCB classifies air quality based on AQI levels: 0-50 is “good”, 51-100 “satisfactory”, 101-200 “moderate”, 201-300 “poor”, 301-400 “very poor”, and 401-500 “severe”.

The weather appeared to influence the temporary improvement in air quality. Sunday saw the minimum temperature drop to 15.8 degrees

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