Delhi's air quality slips into 'severe' category morning after Deepavali, AQI at 404

Meanwhile, several other key areas in the capital continued to reel under the 'Very Poor' air quality bracket. Rajiv Chowk clocked an AQI of 381 at 1:30 a.m., while the area surrounding South Extension registered an AQI of 360 at 4:00 a.m.