A thick layer of smog blanketed Delhi on Saturday as the overall Air Quality Index (AQI) stood at 360 in the national capital, according to the 9 am bulletin of the Central Pollution Control Board (CPCB). Several areas in Delhi reported AQI levels above 400, including Vivek Vihar (423), Anand Vihar (422), Bawana (419), and Jahangirpuri (417).