The Air Quality Index (AQI) has been dropped to ‘very poor’ category again in several parts of national capital of Delhi. In the last 24-hour average AQI in Delhi was recorded at 307, which falls in the ‘very poor’ category, as per the Central Pollution Control Board. The AQI in Alipur was recorded at 314, in Ashok Vihar at 331, Aya Nagar (316), Bawana (358), and Burari Crossing (352).