The national capital woke up to a layer of smog on Diwali morning with the city's air quality index (AQI) slipping into the "very poor" category, as it crossed the 300-mark, reported news agency PTI.

According to the SAMEER app by the Central Pollution Control Board (CPCB), Delhi recorded an overall AQI of 339 at 9 am. Data from around 38 monitoring stations showed that most parts of the city reported air quality levels above 300.