According to Railways, 26 trains have been delayed, nine rescheduled and seven cancelled.
An official of the MeT department said that the minimum temperature settled at 13.2 degree Celsius.
The official said that the humidity level recorded at 8.30 am was 91 per cent.
The visibility was recorded at 1,500 meters at 5.30 am, which dropped to 1,000 meters at 8.30 am in the national capital.
Delhi has been experiencing dense smog for about a week, forcing authorities to enforce emergency measures such as banning construction activities and brick kilns in the National Capital Region.