Flight operations at Delhi airport were affected today as dense fog brought down visibility in some parts of the national capital to zero. Passengers have been advised to contact their respective airlines for updates on their flights. The mercury dipped to 9.4 degrees Celsius, as reported by the India Meteorological Department (IMD) in Delhi. The visibility in various parts of the capital plummeted to a mere 125 meters, causing widespread disruptions to daily life. The National Capital Region (NCR) also bore the brunt of the thick fog, resulting in low visibility across most areas.