North India is experiencing a severe cold wave with biting temperatures and dense fog across states including Uttar Pradesh, Delhi, Haryana, and Madhya Pradesh. Poor visibility is disrupting air, rail, and road transport. Cities like Varanasi, Delhi, Gwalior, and Ayodhya are particularly affected. The Meteorological Department attributes the harsh conditions to an active western disturbance, predicting their persistence. Authorities have established night shelters and roadside facilities to protect citizens and animals.