The overall AQI at around 8 am on Friday in Delhi stood at 434, categorised in 'severe' category, amid cold weather and a layer of smog. However, Rohini, RK Puram, Sirifort, and Dwarka Sector 8 were among those that recorded an AQI of over 450, the 'severe-plus' level according to the Central Pollution Control Board (CPCB).