Red Alert for UP Fog, Delhi on Yellow Alert; Cold Wave Grips North India

• IMD issues Red Alert for Uttar Pradesh due to dense fog and severe cold day conditions.
• Delhi under Yellow Alert for moderate to dense fog for two days; air quality 'Very Poor'.
• Orange Alert for Himachal Pradesh, Punjab, Haryana, Chandigarh for dense to very dense fog.
• Widespread dense fog predicted across North, East, and Northeast India until early January.
• Cold wave conditions expected in Rajasthan, Jharkhand, and parts of Uttar Pradesh and Bihar.

Why It Matters: IMD warns of severe fog and cold wave across North India, with UP on Red Alert and Delhi's air 'Very Poor'.