New Delhi, Jan 28: Dense fog enveloped Delhi and its adjoining regions of Faridabad, Gurugram, Ghaziabad and Noida on Sunday. Operations of a numerous trains have been affected due to the low visibility. Flights from the Indira Gandhi International Airport (IGIA) have been delayed, rescheduled or cancelled owing to the thick fog cover in the national capital. Also Read - As Winter Sets In, Thousands of Migratory Birds Arrive at Odisha's Bhitarkanika National Park

On Sunday, 38 trains will be arriving late in Delhi whereas, five have been rescheduled and 18 cancelled due to low visibility and operational reasons. Also Read - Delhi Temperature Rises a Notch, Air Quality Drops to 'Very Poor' Again as Smog Thickens

Meanwhile, the Air Quality Index of Delhi’s Lodhi Road area was at a moderate level. The prominent pollutants PM 2.5 recorded at 211 and PM 10 at 213 on Sunday. Also Read - Brace Yourself As India to Have a Colder & Harsher Winter Than Usual This Year | Here's The Reason

According to The Skymet Weather, the persistence of fog could be attributed to the flow of northwesterly winds. These light winds are dry and cold in nature reaching the region straight from the snow-clad mountains.

It further predicts that the maximum temperatures in Delhi, on Sunday, are expected to rise by 2 to 4 degrees, ranging between 19 and 23 degree Celsius. Night temperatures are anticipated to remain close to normal, settling in the range of 6 and 10 degree Celsius. Days would be clear, with bright sunshine and nights are likely to remain cold, the agency said.

Furthermore, the cold weather conditions are likely to continue not just in Delhi, but other plains of North India such as Punjab, Haryana, North Rajasthan and Uttar Pradesh as well for the next 48 hours.