Operations of all domestic flights from the Indira Gandhi International Airport in Delhi were cancelled and rail and road traffic severely disrupted on Monday night as a dense fog engulfed the national capital.

The visibility at the airport was less than 50 mt and no flight has either taken off or landed after 2000 IST as the fog, which had descended on Sunday night, thickened further tonight.

Delhi shivered as the maximum temperature plummeted to less than 15 degrees C on Monday.

The forecast looked bleak, with the Met Department saying foggy conditions would continue on Tuesday as there has been no wind to clear the fog.

On Sunday night, Delhi experienced the most dense fog of the season so far, especially over the IGI airport, reducing the visibility and Runway Visual Range to 50 and 150 mt, respectively.

The airport was mostly closed on Sunday night with air traffic operating only using the CAT-IIIB Instrument Landing System.

The situation improved only slightly during the day on Monday, but low visibility conditions continued with the Visibility Maxima and RVR Maxima rising to 400 mt and 800 mt respectively, R K Jenamani, director (Incharge) of Met Department at the IGI Airport, said.

The moisture level was very high at 95 per cent, he said.