A thick fog enveloped Delhi on Saturday, reducing visibility and intensifying the ongoing cold wave. The minimum temperature dipped to 7.6°C, with the maximum likely to reach 23°C. Air quality in the national capital remained near the 'severe' category, with Anand Vihar recording an AQI of 414. The IMD predicts an extended cold wave for much of North India, with severe conditions in Himachal Pradesh and parts of Rajasthan, Punjab, and Jammu. Light snowfall is anticipated in higher reaches later in the week.