A thick blanket of fog engulfed the national capital and its suburbs on the New Year Day with visibility dropping to zero, hitting domestic and worldwide operations at the Delhi airport and delaying trains departing from and arriving to Delhi. Most of the northwestern plains are in its grip.
On Sunday moring, over 40 flights were diverted to other airports and several were cancelled.
Delhi airport has advanced technology for low-visibility landings, called CAT IIIB.
Monday's maximum temperature settled at 20.1 degrees Celsius, one notch above the season's average while the minimum was recorded at 5.7 degrees Celsius, a notch below the season's average.
All flights - both domestic and global - were not allowed to take off between 6 am and 11 am.
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The passengers had driven through fog-covered roads to the airport but the operations at the airport were severely affected for around five hours in the morning, as the runway visibility dropped below 50 metres. The visibility later improved to 100 metres at 3 a.m. and to 200 metres at 6 a.m.
The Northern Railways said over 50 trains coming to Delhi were running late and 20 were rescheduled.
The maximum temperature is likely to hover around 22 degrees Celsius, he said. SAFAR, which has its own monitoring network, recorded "severe" levels of pollution.
Tuesday began on a very cold note for Delhi-NCR people with a dense fog covering the sky in the entire region.
Many took to Twitter to share pictures of the overcrowded domestic terminal where passengers could be seen sitting on floors and staircases.