Fog delays trains, flights in Delhi, Bengaluru: All you need to know

Airlines like Indigo, SpiceJet and Vistara airlines notified their passengers well in advance on Twitter and via SMS

As dense fog blanketed the national capital on Friday with the visibility dropping to 400 meters, flight operations at the Indira Gandhi International Airport and were affected. According to Indian Railways, as many as 12 trains were rescheduled after getting delayed by at least two hours.

"The minimum temperature was recorded at 7.1 degrees Celsius, the season's average. At 8.30 a.m. the humidity was recorded at 100 per cent, while the visibility was recorded at 400 meters," an India Meteorological Department (IMD) official said.

"There was moderate to dense fog in the morning. The sky will remain mainly partly cloudy with haze