The operations were on hold since 7:30 am when the visibility hovered around 75 metres and dropped to 50 metres later. The density of the fog could be judged by the fact that runway visual range (RVR) decreased to 50 metres at the IGIA on the New Year's eve.
Hundreds of passengers at Delhi's airport and several railway stations in north India were left stranded on Monday after multiple flights and trains got affected due to the thick fog.
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Over 150 flights were delayed, almost 50 diverted and an estimated 20 were cancelled. Also the airport has advanced technology for low-visibility landings - CAT IIIB system - under which an aircraft can land in visibility of 25 to 50 metres. Sources said that almost 50 planes were sent to nearby airports as many pilots were not trained in this technology. However, visibility improved during the day, it went up to 2000 meters and the operation became normal, but due to the trouble in the morning, delayed planes were delayed and waiting for six hours. The Indian Meteorological Department yesterday had predicted dense fog for today morning and mist/shallow fog during the day, prediction that came completely true as citizens in Delhi woke up in the New Year.
At least two global flights were diverted in the morning. An official of the department said that it was the densest fog of this season. One Air India flight from Paris was diverted to Mumbai while an Oman Air flight from Muscat was diverted to Jaipur, as per the officials.