The visibility at Safdarjung and Palam was recorded at 300 meters and 200 meters respectively at 5.30 AM. It dipped to 200 meters at Safdarjung while it was 300 meters at Palam, at 8.30 AM, said the official.
The fog affected visibility resulted in late running of 52 trains while 7 trains were rescheduled, said a Railways spokesperson.
Flight operations at Delhi airport, however, remained normal, said a Delhi airport spokesperson.
Humidity was recorded at 97 percent at 8.30 AM.
The maximum temperature was recorded at 25.2 degrees Celsius yesterday, while minimum settled at 7.8 degrees Celsius.