Delhi’s air quality deteriorated from ‘very poor’ to the ‘severe’ category on Wednesday morning, the Ministry of Earth Sciences’ monitoring system SAFAR informed.

The national capital’s air quality index (AQI) was in ‘severe’ category on November 15 the last time but after that, it had improved and remained in either “poor” or “moderate” category until November 22.

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SAFAR has already predicted improvement in the AQI for Wednesday.

According to the Central Pollution Control Board(CPCB) mobile app, SAMEER, the city’s air quality index (AQI) was recorded at 401. It was 388 on Tuesday. The AQI in the city was 302 on Monday, 274 on Sunday, 251 on Saturday, 296 on Friday and 283 on Thursday.

Stubble burning contributed to 5% of the PM2.5 pollutants in Delhi’s air on Tuesday.  The farm fires accounted for 6% of Delhi’s PM2.5 pollution on Monday and 12% on Sunday. It was 13% on Saturday, 15% on Friday, 20% on Thursday and eight per cent on Wednesday.