Delhi continues to battle severe fog for the third consecutive morning, with 51 trains delayed, officials reported on Sunday.
A dense fog covered several parts of the city, significantly reducing visibility.
The Met Office revealed that Palam witnessed zero visibility between 4 am and 7:30 am.
On Saturday, the region had experienced a nine-hour spell of complete visibility loss. The situation remained grim, with visibility dropping to 0.50 metres at Safdarjung around 5:30 am.
Read more: Over 250 flights cancelled, trains late as fog blankets North India
Flight operations were also severely impacted, with flight tracking website Flightradar reporting six cancellations and 114 delays at Indira Gandhi International Airport at 8 am on Sunday. The average delay time was 18 minutes.
A far worse scenario unfolded on Saturday, when 48 flights were cancelled and 564 delayed.
"General visibility at both Palam and Safdarjung airports was reduced to zero in very dense fog at 7:30 am," the Met office stated.
The air quality in the national capital was also in the 'very poor' category, with an Air Quality Index (AQI) reading of 372 at 9 am, according to data from the Central Pollution Control Board.
In terms of temperature, Delhi's minimum settled at 9.4°C, two notches above normal, with a humidity level of 95 per cent at 8:30 am. The Met office has forecast dense to very dense fog throughout the day, with a maximum temperature likely to be around 18°C.