Delhi suffered its fourth consecutive cold wave day on Sunday, with the minimum at the city’s base station Safdarjung falling below 2 degrees Celsius for the first time in two years and the city experiencing one of its worst fog spells of the season with nine hours of lower than 200m visibility. Over 100 flights were delayed at IGI Airport due to dense fog and 42 trains were running late.Delhi suffered its fourth consecutive cold wave day on Sunday, with the minimum at the city’s base station Safdarjung falling below 2 degrees Celsius for the first time in two years and the city experiencing one of its worst fog spells of the season with nine hours of lower than 200m visibility. Over 100 flights were delayed at IGI Airport due to dense fog and 42 trains were running late.