Delhi's air quality on Sunday slipped to the 'very poor' category as a combination of fog and low wind speed prevented the dispersal of pollutants, the Central Pollution Control Board (CPCB) said. Several areas in the national capital witnessed the Air Quality Index (AQI) crossing the 'severe' mark, with readings beyond 400.

At 7 am, the AQI was 377, according to the CPCB-developed Sameer app, a huge spike from Saturday's 233 and 218 on Friday. Wazirpur in north Delhi and RK Puram in south Delhi were the most polluted areas in the city with readings of 432 and 425, respectively, both falling in the 'severe' category.

According to the CPCB, an AQI between 0 and 50 is considered good, 51-100 satisfactory, 101-200 moderate, 201-300 poor, 301-400 very poor, and 401-500 severe.

Several are

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