Delhi's air quality index (AQI) on Friday was in the 'poor' category after being in the 'very poor' category for four consecutive days. As per Central Pollution Control Board (CPCB) data, the AQI in Delhi was recorded at 293 at 6 am, days after Diwali celebrations. Anand Vihar reported an AQI of 403, followed by Wazirpur at 337.