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Civil Aviation Minister Jyotiraditya Scindia said that all stakeholders are working round-the-clock to minimise fog-related disruptions.
The traffic on the roads was extremely slow too as fog reduced the visibility to a few feet.
Delayed trains include the Varanasi-Delhi Vande Bharat Express and Rajendranagar-New Delhi Rajdhani Express.
Runway Visual Ranges (RVRs) now range from 400 to 800 metres, indicating improved aviation conditions.
Data from private flight trackers showed several flights had been delayed.
The IMD warned of an impact on agriculture, livestock, water supply, transport and the power sector at some places.
A blinding layer of dense fog over north India, including Delhi, caused major inconvenience to commuters.
According to IMD, very dense fog is when visibility is between 0 and 50 metres, between 51 and 200 metres is dense fog, 201 and 500 metres is moderate fog, and 501 and 1,000 is shallow fog.
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