Delhi's air quality slipped back to the 'severe' category on November 23 morning with an AQI of 420 while the minimum temperature was recorded at 11.4 degrees Celsius.
Out of 38 monitoring stations, nine recorded air quality in the 'severe plus' category with AQI exceeding 450.
Nineteen other stations recorded 'severe' air quality with AQI levels between 400 and 450. The remaining stations recorded AQIs in the 'very poor' category, news agency PTI reported.
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Delhi's air quality has remained hazardous for over 20 days. On October 30, it first slipped into the 'very poor' category and stayed there for 15 days. It worsened further last Sunday as Delhi recorded 'severe' air quality and stayed so on Monday and Tuesday.
The Supreme Court said the highest GRAP-4 restrictions would continue until at least November 25 when it would review if it can be lifted.
ccording to the Central Pollution Control Board (CPCB), the city's 24-hour average Air Quality Index (AQI) at 4 pm on Friday was 393, up from 371 a day earlier.
By Wednesday, the air quality was in the 'severe plus' category.
Favorable wind conditions brought slight relief on Thursday but the air quality began deteriorating again, nearing the 'severe' category, on Friday.
With PTI inputs
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