According to a Met department official, visibility was recorded at 800 meters at 5.30 AM which dropped to 200 meters at 8.30 AM.
The fog cover led to cancellation of six train services as announced earlier while 14 trains were reported to be running late.
Flight operations at Delhi Airport were normal, said a spokesperson.
The humidity was recorded at 97 per cent at 8.30 AM. The weatherman predicted a clear day ahead.
"It will be a mainly clear day and maximum temperature is expected to hover around 25 degrees Celsius," the MeT official added.

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