The air quality in Delhi deteriorated to the “very poor” category on Thursday after remaining “poor” for the past few days. The national capital was covered in a toxic haze in the early hours of the day.

The average Air Quality Index at 3.06 pm was 377, categorised as “very poor”, according to data from the Sameer application, which provides hourly updates published by the Central Pollution Control Board.

The overall average AQI a day earlier was 279.

An index value between 0 and 50 indicates “good” air quality, between 51 and 100 indicates “satisfactory” air quality and between 101 and 200 indicates “moderate” air quality. As the index value increases further, air quality deteriorates. A value of 201 and 300 means “poor” air quality, while between 301 and 400 indicates “very poor” ai

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