New Delhi:Dense fog enveloped parts of the Delhi-National Capital Region (NCR) this morning, reducing visibility to zero and delaying more than 150 flights and about 26 trains.Flight delays averaged 41 minutes, aviation website FlightRadar24 said.The Delhi International Airport Limited (DIAL), in an update this morning, said the flight departures have been “impacted” due to dense fog.The DIAL, however, reassured travellers that CAT III-compliant flights can land and depart from the airport. The India Meteorological Department (IMD) has issued a moderate to very dense fog warning for many parts of North India, including Punjab, Haryana and Rajasthan.Hundreds of flights and trains have been cancelled or delayed due to thick fog in the past few weeks in North India.The capital’s air quality index (AQI) was recorded at 408 around 6 am, dropping to the ‘severe’ category from ‘very poor’, according to the data on the Central Pollution Control Board website.An AQI between zero and 50 is considered ‘good’, 51 and 100 ‘satisfactory’, 101 and 200 ‘moderate’, 201 and 300 ‘poor’, 301 and 400 ‘very poor’, and 401 and 500 ‘severe’.










