New Delhi: A thick layer of fog engulfed Delhi and the National Capital Region (NCR) on Saturday. The IMD said that 9.8℃ temperature was recorded in Palam area of the capital city at 5:30 am today, which is likely to fall by 0.2℃ during next 24 hours. Safdarjung recorded 8.6℃ temperature, which is likely to rise by 1.2℃ during next 24 hours. Also Read - Delhi Traffic Alert: Ghazipur, Singhu, Harewali Among Others Shut For Traffic Movement | Check Advisory Here

“Zero visibility was reported over Delhi, Lucknow and Amritsar due to variable and calm lower-level winds. Similar fog conditions are likely in the morning of January 17 as well. Visibility is likely to improve from January 18”, the India Meteorological Department (IMD) said in a statement. Also Read - Delhi Adarsh Nagar Chain Snatching-Murder: Police Mulling Separate Snatching Law With Enhanced Punishment

Following this, 4 flights to and from Delhi airport have been delayed and at least one flight stands cancelled due to fog. Delhi Airport has issued an advisory asking passengers to contact the airline concerned for updated flight information. “Due to dense fog, only CAT IIIA and CATIII B compliant aircraft and pilots are able to operate. Passengers are requested to contact the airline concerned for updated flight information, Any inconvenience is regretted,” the airport tweeted at 1.30 am today. Also Read - Bengaluru, Shimla 'Most Livable' Cities in Govt's Ease of Living Index | Check Complete List Here

Besides, train operations are also expected to delayed today.

According to the IMD, ‘very dense’ fog is when visibility is between 0 and 50 metres. In case of ‘dense’ fog, visibility is between 51 and 200 metres, ‘moderate’ 201 and 500 metres, and ‘shallow’ 501 and 1,000 metres. The Safdarjung Observatory, which provides representative data for the city, recorded a minimum of 2 degrees Celsius, five notches below normal, as against 3.2 degrees Celsius on Wednesday.

On January 1, the city had recorded a minimum of 1.1 degrees Celsius, lowest for the month in 15 years.

Meanwhile, the capital city’s air quality remained “severe” on Saturday as well. “Delhi’s overall air quality index (AQI) stands at 492 (severe category)”, said System of Air Quality & Weather Forecasting & Research (SAFAR).  An AQI between zero and 50 is considered ‘good’, 51 and 100 ‘satisfactory’, 101 and 200 ‘moderate’, 201 and 300 ‘poor’, 301 and 400 ‘very poor’, and 401 and 500 ‘severe’.