Dense fog and severe air pollution significantly disrupted life across Delhi-NCR on Wednesday, December 31, 2025. Flight operations at Indira Gandhi International Airport were heavily impacted, with at least 148 flights cancelled and over 150 delayed due to low visibility. Many areas experienced near-zero visibility, slowing road and rail transport. Delhi's Air Quality Index (AQI) remained in the 'very poor' to 'severe' category, with several stations recording AQI above 400. Airlines and airport authorities issued advisories, urging passengers to check flight statuses.