People sit around a fire to keep themselves warm during a foggy morning, in Delhi on Monday. Pic/PTI

Six flights were cancelled and over 60 delayed due to fog at the Indira Gandhi International Airport here this morning. Nearly 40 domestic and 26 international flights were among those delayed. According to the Indian Meteorological department, general visibility improved to 200 metres at IGI as compared to zero metres the past two days. The runway visual range (RVR) was between 800-1000 metres early this morning. This is also an improvement, as RVR was in the range of 50-100 metres in the last two days.