On December 19, 2025, a blanket of dense fog blanketed Delhi, reducing visibility to less than 100 meters in many areas and causing major disruption in travel. CAT III low visibility procedures were implemented at Indira Gandhi International (IGI) Airport, but operations remained affected.

**Airport problems**: About 79 flights were canceled (including some international), while more than 230 flights were delayed, with an average departure delay of about 49 minutes. Airlines like IndiGo, Air India and SpiceJet advised passengers to check the status.

**Impact on rail and road**: Dozens of trains under Northern Railway were delayed by 30 minutes to several hours due to speed limit due to fog. Speed ​​limits and fines implemented for road safety in Uttar Pradesh.

**Air quality concerns**: The city’s 24-hour average AQI stood at 387 (‘very poor’), which was worse than the previous day. Many of the 39 monitoring stations—including Vivek Vihar (436), R.K. Puram (436), Anand Vihar and Punjabi Bagh—recorded levels above 400 (‘severe’). Conditions were also bad in nearby Noida and Ghaziabad, where stagnant winds had trapped pollution.

**Weather Forecast**: IMD issues yellow alert for dense fog, especially in the morning. Thursday was the coldest day in Delhi this season, the maximum temperature was 20.1°C. Minimum temperatures may rise by 2-4°C over the next three days, but dense fog may persist or return on December 21-22 due to the incoming western disturbance. Slight improvement in AQI is possible on Saturday.

Health advice advised vulnerable people to avoid going out amid the mix of dangerous fog and pollution. Travelers should keep a close eye on updates.