Delhi enveloped in a thick blanket of fog this morning as the minimum temperature settled at 8.4 degrees Celsius. It is said that the visibility has been reduced to 50 metres in Palam at 5.30 AM. It is to be seen if the fog blanket lifts later in the day. Maximum temperature through the day is likely to hover around 18 degrees Celsius. Also, the airport had to hold down flights before the fog layer cleared a little.