Group 1 - The air quality in New Delhi has severely deteriorated, with the Air Quality Index (AQI) exceeding the World Health Organization's recommended limit by 30 times, leading to significant disruptions in flights and train services [1] - Over 40 flights were canceled and dozens delayed due to toxic smog, while more than 50 trains experienced hours of delays [1] - The average AQI in New Delhi reached 471, categorized as severe, with some monitoring stations recording AQI levels as high as 500, the peak measurement [1][2] Group 2 - The Indian government has activated the highest level of its graded response action plan to combat pollution, which includes banning old diesel trucks from entering the city, halting construction activities, and shifting young children to online classes [1] - A report from the Indian federal government indicated that over 200,000 cases of acute respiratory diseases were recorded in six public hospitals in New Delhi from 2022 to 2024 due to worsening air pollution [2]