Day 4 of zero visibility in Delhi

Delhi logged zero visibility for a fourth consecutive day on Sunday, for over three hours between 4am and 7.30am this time, impacting flight and train operations.

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The fog spell, however, was shorter-lived than the nine hours of zero visibility clocked a day before.

Officials at Delhi's Indira Gandhi International (IGI) Airport said no flight was diverted or cancelled on Sunday, but several were delayed. According to the flight tracking website Flightradar24, over 300 flights were delayed at the airport. The website also showed 18 cancellations, but it did not specify whether this was due to adverse weather or other reasons.

"No cancellations or diversions were reported on account of fog on Sunday. On Saturday, 19 flights had to be diverted and over 40 were cancelled," an official at the airport said.

The India Meteorological Department (IMD) said visibility was zero at the Palam observatory for three hours, while it was 50 metres at the Safdarjung observatory at 5.30am, making the early morning commute difficult. IMD issued a yellow alert for Monday, forecasting moderate fog in most places and dense fog in isolated pockets.