Dense fog and harsh winter conditions have caused widespread disruption across northern India, affecting air and rail travel. On Tuesday, 118 flights were cancelled and eight diverted in Delhi, while more than 100 trains were called off in eastern Uttar Pradesh, including cities like Lucknow, Gorakhpur, and Prayagraj. Additional flight cancellations and delays were reported in Mumbai, Bengaluru, Kochi, Hyderabad, Kolkata, Amritsar, Chandigarh, Jaipur, Dehradun, Indore, Patna, and Bhopal.