The air quality in Delhi was in 'very poor' category on the morning of Monday (Diwali), with most monitoring stations recording AQI above 300. AQI was in the 'severe' category at Anand Vihar (414) and Wazirpur (407) recording stations. According to Central Pollution Control Board (CPCB), the air quality is expected to be in 'severe' category on Tuesday and Wednesday.