The air quality in the national capital remained in the 'very poor' category, as per data from the Central Pollution Control Board. The Air Quality Index (AQI) was recorded at 377 at 6 am, a slight improvement from 385 at the same time the previous day.

The AQI levels fell into the "severe" category in areas like RK Puram (401), Siri Fort (426), Patparganj (410), and Dwarka Sector-8 (405), among others

A dense smog blanketed Delhi, triggering warnings from airport and airline officials about potential flight disruptions as deteriorating air quality reduced visibility to zero in some regions.

The city experienced cold wave conditions as minimum temperatures dipped to 10 degrees Celsius at 5:30 am on Sunday morning.

On Saturday, visibility in Delhi plummeted to zero for an unprecedented nine-hour stretch, marking the season's longest duration of such conditions.

More than 45 flights were cancelled due to bad weather conditions at Delhi as well as at the destination airports, the official said.

Delhi airport on Saturday saw 19 flight diversions, many cancellations and over 400 flight delays as low visibility conditions due to dense fog impacted operations for the second straight day.