Delhi's air quality slips into 'severe' category on Diwali, AQI at 404

Delhi experienced a significant decline in air quality overnight, with areas recording severe pollution levels. The Central Pollution Control Board reported an Air Quality Index of 406 at ITO, indicating hazardous conditions. Visibility was greatly reduced as a thick layer of smog enveloped the city during the early morning hours. Rajiv Chowk and South Extension also reported very poor air quality readings.