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Delhi is once again facing serious air pollution problems following the Diwali celebrations of November 8, 2026. The national capital witnessed a significant deterioration in air quality as firecracker emissions, vehicle pollution, construction dust and smoke from agricultural stubble burning contributed to rising pollution levels. Thick layers of smog covered several parts of the city, raising concerns about public health and environmental safety.
According to reports, Delhi recorded an average Air Quality Index (AQI) of 376 on Diwali day, November 8, making it the most polluted Diwali in the capital in five years. The situation became more concerning on November 9, when several monitoring stations reported AQI readings above 400, placing them in the severe pollution category.
Although air quality showed some improvement on November 10 due to increased wind speeds, pollution levels remained a major concern across several neighbourhoods.
Delhi Records Its Most Polluted Diwali in Five Years
Delhi experienced its worst Diwali air quality in five years, highlighting the continuing challenges of controlling pollution during the festive season.
According to Central Pollution Control Board (CPCB) data, the city’s average AQI reached 376 at 4 PM on November 8. The reading was higher than the Diwali-day AQI recorded during the previous three years.
The comparison highlights the worsening situation:
| Year | Diwali AQI |
|---|---|
| 2022 | 312 |
| 2023 | 218 |
| 2024 | 328 |
| 2025 | 345 |
| 2026 | 376 |
The increase in pollution was particularly concerning because restrictions on firecrackers and other pollution-control measures were already in place.
Several areas experienced thick smoke and reduced visibility, making outdoor activities uncomfortable for residents.
AQI Crosses 400 in Several Parts of Delhi
The situation became more serious on November 9, when multiple monitoring stations recorded air quality in the severe category.
According to reported CPCB monitoring figures, some of the affected locations included:
- Jahangirpuri: AQI 433
- Chandni Chowk: AQI 418
- Mundka: AQI 417
- RK Puram: AQI 364
- Lodhi Road: AQI 370
- Anand Vihar: AQI 335
An AQI reading above 400 falls into the severe category under India’s air-quality classification system.
On November 10, the situation showed some improvement. NDTV reported that Delhi’s average AQI declined to 299, although 23 monitoring stations continued to report very poor air quality.
This improvement was largely associated with increased wind speeds, which helped disperse some of the accumulated pollutants. However, experts and residents remain concerned about the possibility of pollution rising again as winter conditions continue.
Why Is Delhi’s Air Pollution Increasing After Diwali?
Delhi’s air pollution is influenced by several factors, particularly during October and November. The combination of festive firecrackers, vehicle emissions, industrial activities, construction dust and agricultural residue burning creates additional pressure on the city’s already polluted atmosphere.
1. Firecracker Emissions
Firecrackers are one of the major contributors to the sudden increase in pollution during Diwali. Burning crackers releases particulate matter and other pollutants into the atmosphere.
Despite restrictions, firecrackers were reportedly used beyond the permitted hours in several locations. These emissions contributed to the formation of thick smoke and deteriorating air quality across the capital.
2. Stubble Burning in Neighbouring States
Agricultural stubble burning is another important factor affecting air quality in Delhi-NCR during the winter season.
Farmers in neighbouring states, particularly Punjab and Haryana, burn crop residue after harvesting to prepare their fields for the next agricultural cycle.
Reports cited 1,248 crop-residue burning incidents across Punjab, Haryana, Uttar Pradesh and Delhi on Diwali, compared with 135 incidents on the corresponding festival day in 2025.
3. Vehicle and Industrial Emissions
Delhi has a large number of vehicles operating every day. Cars, buses, trucks and other vehicles release pollutants that contribute to poor air quality.
Industrial emissions and diesel-powered generators also add to the pollution burden, particularly when weather conditions prevent pollutants from dispersing.
4. Construction Dust and Weather Conditions
Construction and demolition activities release dust particles into the atmosphere. When combined with low wind speeds, cooler temperatures and stagnant weather, these particles can remain suspended in the air for extended periods.
During winter, atmospheric conditions can trap pollutants closer to the ground, increasing the concentration of harmful particles that people breathe.
Health Risks of Breathing Highly Polluted Air
Poor air quality can affect people of all age groups, particularly children, elderly individuals and people with existing respiratory conditions.
Exposure to high concentrations of air pollutants can cause several health problems, including:
- Breathing difficulties and shortness of breath.
- Irritation in the eyes, nose and throat.
- Persistent coughing and throat irritation.
- Worsening of asthma and other respiratory conditions.
- Increased risk of cardiovascular and respiratory complications.
- Reduced lung function following prolonged exposure.
Fine particulate matter, particularly PM2.5, is especially concerning because these tiny particles can penetrate deep into the lungs and enter the bloodstream.
Residents are advised to monitor local AQI levels and reduce prolonged outdoor activities when pollution levels are high.
Government Measures to Control Delhi Pollution
Authorities have continued implementing pollution-control measures to reduce emissions across Delhi-NCR.
Stage III of the Graded Response Action Plan (GRAP) was already in force from November 6, 2026, ahead of the Diwali pollution spike.
The restrictions include measures targeting non-essential construction and demolition activities, alongside additional pollution-control monitoring.
Delhi authorities have also increased surveillance of construction sites and pollution-related complaints. According to a November 10 report, the Integrated Command and Control Centre received 14 public complaints and generated 74 dust-related alerts in the 24 hours following Diwali.
Water sprinklers, anti-smog measures and enforcement teams are among the measures being used to address dust pollution and other violations.
However, controlling Delhi’s air pollution requires coordinated action throughout the year rather than temporary measures during the winter season.
Delhi Air Pollution: What Can Residents Do?
While government authorities work to control pollution, residents can also take precautions to reduce their exposure.
Some practical precautions include:
- Check the daily AQI before planning outdoor activities.
- Avoid unnecessary outdoor exercise when pollution levels are very high.
- Consider using a well-fitting N95 mask when outdoor exposure cannot be avoided.
- Keep windows closed during periods of particularly high outdoor pollution, while maintaining appropriate indoor ventilation and filtration.
- Avoid burning waste, leaves and other materials.
- Seek medical advice if you experience persistent breathing difficulties, chest discomfort or other concerning symptoms.
People with asthma or other respiratory conditions should follow their prescribed treatment plans and take additional precautions during periods of severe pollution.
What Is the Outlook for Delhi’s Air Quality?
Delhi’s air quality is expected to remain a concern as winter approaches. Although stronger winds helped improve pollution levels on November 10, unfavourable weather conditions, vehicle emissions, construction dust and agricultural stubble burning could continue affecting the capital.
The situation highlights the need for long-term pollution-control strategies, improved public transport, cleaner industrial operations, effective construction-dust management and better coordination between neighbouring states.
The latest post-Diwali pollution episode is another reminder that air pollution is not just a seasonal inconvenience but a serious public health and environmental challenge for millions of people living in Delhi-NCR.
Frequently Asked Questions (FAQs)
1. What is the AQI in Delhi after Diwali 2026?
Delhi recorded an average AQI of 376 on November 8, 2026, its highest Diwali-day reading in five years. On November 10, the average AQI improved to 299, although several monitoring stations continued to report very poor air quality.
2. Why did Delhi’s air pollution increase after Diwali?
The increase was associated with firecracker emissions, vehicle pollution, construction dust, industrial emissions, agricultural stubble burning and unfavourable weather conditions.
3. Which areas of Delhi recorded severe AQI levels?
Jahangirpuri, Chandni Chowk and Mundka were among the locations that recorded AQI readings above 400 on November 9.
4. Is Delhi’s air quality improving?
Delhi experienced some improvement on November 10 due to increased wind speeds. However, pollution remained high in several areas, and the situation continued to require monitoring.
5. What is the safe AQI level in India?
An AQI between 0 and 50 is classified as good under India’s National Air Quality Index. Readings above 300 indicate very poor or severe air quality, depending on the exact level.