After prevailing in the 'Very Poor' category, national capital Delhi's air quality in several places dipped to 'severe' on Wednesday. According to the data shared by the Central Pollution Control Board (CPCB), the air quality index (AQI) of Delhi is now standing at more than 400 as areas like Ashok Vihar recorded AQI of 405 while the same is 447 in Bawana, 405 in Dwarka, and 429 in Jahangirpuri.