As fog continued to cover the capital city on Sunday morning, trains services have taken a hit in Delhi and NCR with 73 trains being affected.

Owing to poor visibility due to the fog, at least 28 trains have been cancelled, 36 trains are running late, nine trains have been rescheduled.

Meanwhile, air pollution levels in Delhi have also raised concerns in the city as prominent pollutant PM 2.5 remained in ' very poor' category in the Lodhi Road area.

On Saturday, the national capital experienced its first coldest day of this season with minimum temperature at 4.2 degree Celsius, three notches below the season's average.

The Meteorological department has forecast moderate fog in Delhi with visibility likely to remain low.

Delhi has been battling air pollution for the past many days further lowering the visibility levels. -- ANI