Four people died after a jeep veered off the road and fell into a pond in Rajasthan’s Bharatpur district on Tuesday because of dense fog, PTI reported. The accident occurred near the town of Deeg just after midnight.

The jeep was on its way from Mathura in Uttar Pradesh to Alwar and was carrying nine members of a family. Five of those injured are undergoing treatment at a hospital.

Dense fog also affected visibility in Delhi, Haryana, Punjab and Uttar Pradesh. Train and flight services in the national Capital continued to suffer for the second straight day because of thick fog.

More than 60 flights were delayed in the morning, and six were cancelled, PTI reported. At least 64 trains were delayed, 24 rescheduled and 21 were cancelled because of poor visibility.

“The sky will remain clear during during the day, with dense fog in the morning,” IANS quoted a Weather Department official as saying. The minimum temperature was around 8 degrees Celsius, and the visibility was at 300 m around 8.30 am, an improvement from Monday morning’s 50 m.

The Air Quality Index for Particulate Matter 2.5 – the concentration of the particulate matter of diameter less than 2.5 microns – was at a hazardous 409 at 11 am on Tuesday, according to the United States Embassy’s monitoring.

Passengers at the Indira Gandhi International airport in New Delhi had suffered on Monday too as more than 500 flights were delayed due to poor visibility. The Delhi airport had resumed functioning in the afternoon after dense fog in the morning forced it to halt its operations for nearly four hours.