Delhi: Over 170 flights affected, 20 trains delayed due to fog

A four-and-a-half-hour delay is expected on the arrival of the Katihar-Amritsar Express, the railways' data mentioned.

Biting cold, dense fog in North India; 21 trains running late. Details here

Delhiites woke up to dense fog in the morning on Friday with a partly cloudy sky and the temperature dropping to below 8 degrees Celcius in most parts of the Delhi-NCR region.