Flight operations resumed after 10 am as flights started landing and take-offs resumed after 11:30 am.
Passengers heading to New Delhi and other northern regions of the Country from Rajiv Gandhi International Airport (RGIA), Shamshabad had to wait for long hours on Monday as many flights were delayed due to heavy fog in New Delhi. Visibility level fell below the minimum required affecting over 100 flights on Sunday.
Visibility at the airport fell to as low as 50 metres on the morning of New Year's Eve, with flight schedules going haywire.
The Air Quality Index (AQI) at Delhi's Shadipur was recorded at 332, and Siri Fort at 388 - both in the "hazardous" category.
The readings have put these areas between "Hazardous" and "Very Unhealthy". Over 150 flights were delayed and almost 50 were diverted, according to an airport official. No flights could take off from Delhi's IGI for almost four hours between 7.30 am and 11.05 am, according to an airport official. The three-hour suspension of flight operations meant that it took hours for the backlog to clear.
Several domestic as well as worldwide flights were affected as fog reduced visibility.
Many took to Twitter to share pictures of the overcrowded domestic terminal where passengers could be seen sitting on floors and staircases.
Dense fog also enveloped parts of Uttar Pradesh as visibility remained low in Varanasi and train operations there were affected as well. The poor visibility also affected the train and flight services with over 56 trains delayed, 20 rescheduled and 15 cancelled.