Delhi's air quality index (AQI) remained in the 'poor' category on Saturday. According to Central Pollution Control Board (CPCB) data, the AQI in Delhi stood at 233 at 7 am, while a thick layer of smog covered the city. The AQI stayed below 300 in most areas, including Anand Vihar. Delhi had recorded an AQI of over 260 on Friday.