Moderate to dense fog occurred at several places in the city. Visibility dropped to 100 metres at Safdarjung observatory, the department said. At least 19 Delhi-bound trains were delayed by two to five hours due to fog in several parts of northern India.
According to northern Railway officials, Vasco-Hazrat Nizamuddin Goa Express was delayed by 5 hours, followed by Manikpur-Hazrart Nizamuddin UP Sampark Kranti Express which was delayed by 3 hours and 45 minutes.
Even Bengalore-Hazrat Nizamuddin Rajdhani Express was running 3 hours behind its schedule, Howarah-New Delhi Poorva Express and Puri-New Delhi Purushottan Express were also delayed by 3 hours.
Meanwhile, the weather experts had earlier said there would be no cold wave until January 8.
Light rains are expected in the capital anytime between January 6 and 8 due to a fresh western disturbance. Widespread rains may also help reduce pollution levels. The overall air quality index stood at 300 (very unhealthy) at 9 am.
(with inputs from IANS)