Delhi is experiencing severe air pollution with AQI levels reaching 'severe' and 'hazardous' categories, compounded by dense fog. This dual environmental challenge has led to significantly reduced visibility across the National Capital Region, causing widespread disruptions to flight and train operations. Authorities have issued orange and red alerts for fog, with airlines warning of delays and cancellations, and advising passengers to check flight statuses. The cold weather is trapping pollutants, exacerbating the smog and haze.