A dense blanket of smog continued to cover Delhi and its adjoining areas on Monday morning as the air quality remained in the ‘severe’ category, reducing visibility and disrupting flight operations. The Air Quality Index (AQI) in the national capital stood at 456 at 6 am, according to the data available on the Central Pollution Control Board (CPCB) website. It was 461 on Sunday – the second-worst December air quality day on record.
An AQI between zero and 50 is considered ‘good’, 51 and 100 ‘satisfactory’, 101 and 200 ‘moderate’, 201 and 300 ‘poor’, 301 and 400 ‘very poor’, and 401 and 500 ‘severe’.
Videos showed a thick layer of toxic air at Delhi’s Akshardham, where the Air Quality Index (AQI) stood at 493.
#WATCH | A thick layer of smog engulfs the National Capital. Visuals from the Akshardham area. AQI here is 493, categorised as ‘severe’ as per the Central Pollution Control Board (CPCB) pic.twitter.com/b9k9fthFDk
— ANI (@ANI) December 15, 2025
More clips show poor visibility in many areas, including the Barapulla flyover – where AQI was recorded 433, and Barakhamba Road – where AQI was 474.
#WATCH | A thick layer of smog engulfs the National Capital. Visuals from the Barapullah flyover. AQI here is 433, categorised as ‘severe’ as per the Central Pollution Control Board (CPCB) pic.twitter.com/3FX7wR5LQx
— ANI (@ANI) December 15, 2025
#WATCH | A thick layer of smog engulfs the National Capital. Visuals from Barakhamba Road. AQI here is 474, categorised as ‘severe’ as per the Central Pollution Control Board (CPCB) pic.twitter.com/VNpgxMF0z7
— ANI (@ANI) December 15, 2025
The India Meteorological Department (IMD) has issued an ‘orange’ alert for dense smog today.
The Delhi Airport issued an advisory for commuters.
“Due to dense fog, flight operations may experience disruptions. We are working closely with all stakeholders to minimise inconvenience to passengers. For the latest flight updates, passengers are advised to contact their respective airlines. We sincerely regret any inconvenience caused,” it said in a post on X.
Update issued at 06:12 hours.
Kind attention to all flyers!#Fog #FogAlert #DelhiAirport pic.twitter.com/qjVGEBhPxu— Delhi Airport (@DelhiAirport) December 15, 2025
IndiGo also issued an advisory, alerting passengers to flight delays.
“Low visibility and fog over #Delhi will impact flight schedules. We’re keeping a close watch on the weather and doing our best to get you where you need to be, safely and smoothly. We request you to stay updated on your flight status via our website or app. Be assured, our teams are here to assist you at every step and ensure support,” it said.
Travel Advisory
Low visibility and fog over #Delhi will impact flight schedules. We’re keeping a close watch on the weather and doing our best to get you where you need to be, safely and smoothly.
We request you to stay updated on your flight status via our website or app. Be…
— IndiGo (@IndiGo6E) December 15, 2025
In another post, the airline also urged passengers to allow additional time while planning their journey to the airport as road traffic may be slower due to the toxic haze. “Our teams are closely monitoring the situation and will keep you updated. As conditions improve, we will continue departures with safety at the forefront,” it added.
The Commission for Air Quality Management (CAQM) on Saturday had invoked the strictest measures (Stage IV) under its air pollution control plan, Graded Response Action Plan (GRAP), including a ban on all construction and demolition activities in Delhi-NCR after pollution levels rose sharply amid unfavourable meteorological conditions. Additionally, the Delhi government directed 50 per cent of staff in government and private offices to work from home, while all schools until Class 11 (except Class 10) were directed to conduct classes in hybrid mode – both physical and online.