The Air Quality Index at 18 of the 39 monitoring stations in Delhi on Thursday recorded readings above 400, categorised as “severe”, showed the Sameer application, which provides hourly updates published by the Central Pollution Control Board, at 1.06 pm.

The application did not have any data from one of the stations at the time.

Despite ongoing restrictions to curb pollution, Delhi’s average AQI stood at 394, placing it at the higher end of the “very poor” category, the data showed.

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 3

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