Over 110 flights were affected at the Delhi airport after dense fog shrouded north India on Wednesday morning as visibility dropped to just 25 metres, disrupting the movement of traffic. The weather office issued a red alert over “very dense fog” in the national capital as cold wave conditions continued. As many as 25 trains headed to Delhi are delayed, Northern railways said.

As roads remained engulfed in fog, several collisions were reported across Uttar Pradesh. One person was killed and 12 others injured after on the Agra-Lucknow Expressway. In Bareilly, a speeding truck rammed into a house near the Bareilly-Sultanpur highway.

The India Meteorological Department (IMD) predicted “dense to very dense fog conditions” over Punjab, Haryana, Delhi, UP, Rajasthan and Madhya Pradesh. 

In Delhi, the Safgarjung observatory recorded a visibility level of 50 metres while at the Safdarjung observatory near the Indira Gandhi International Airport it dropped to just 25 metres. However, commuters reported even lower visibility in several parts of the national capital. 

Apart from Delhi, cities in Haryana, Uttar Pradesh and Punjab saw reduced visibility due to dense haze. In Haryana’s Hisar and Karnal, visibility dropped to 25 metres while in Agra, Bareilly and Bhatinda it reached zero.