Dense fog over north India disrupts travel, 22 trains reaching Delhi delayed by up to six hours

New Delhi: The national capital on Friday recorded a minimum temperature of 7.1 degrees Celsius, a notch below the season average, the weather department said.

Dense fog conditions prevailed in parts of the city with the Palam Observatory near the Indira Gandhi International Airport recording a visibility level of 50 metres at 5:30 am.

According to the Indian Railways, 22 Delhi-bound trains were delayed by one to six hours due to fog.

Very dense fog is when visibility is between 0 and 50 metres, between 51 and 200 metres is dense, between 201 and 500 metres moderate, and between 501 and 1,000 metres shallow.