Delhi’s air quality deteriorated to 'very poor' after Diwali, with an average AQI of around 350 on Tuesday morning. Bawana is the most polluted area in the city, with an AQI of 427, HT reported. It's followed by Wazirpur, Alipur, Jahangirpuri and Burari Crossing. Other areas are Shadipur, Ashok Vihar, Punjabi Bagh, Sonia Vihar and Vivek Vihar.