Post-Diwali air pollution pushed Delhi to its smokiest festival in five years. So the real question now is simple: how do we protect people while the smog lingers?
What happened
Delhi’s average Air Quality Index (AQI) reached 376 on Diwali, 8 November. That is the highest Diwali-day reading since 2021, when it touched 382. Deccan Herald reported these figures from Central Pollution Control Board (CPCB) data. This year’s figure was also 31 points higher than in 2025 and 48 points higher than in 2024.
The next morning brought little relief. Delhi recorded an AQI of 368 at 7 am on 9 November, according to All India Radio. By 10 am, the reading stood at 371. Of the 51 stations that reported data, 14 were in the “severe” band and 33 were “very poor”. Not one station showed good, satisfactory or moderate air.
Smog and fog also cut visibility sharply. At Safdarjung, it fell to just 50 metres at 6.30 am, down from 700 metres a day earlier. The India Meteorological Department linked the haze to dry weather and calm winds. In simple terms, the air had nowhere to go.
The Supreme Court had allowed green firecrackers in Delhi-NCR only during fixed hours on 7 and 8 November. From 9 November, the court restored the complete ban, All India Radio reported. Even so, the smog did not clear overnight. As a result, the capital stayed in the “very poor” band on the morning after Diwali.
Why post-Diwali air pollution matters
The biggest worry is fine dust called PM2.5. These particles are small enough to enter deep into the lungs and even the blood. One monitoring platform put Delhi’s PM2.5 level at about 170 micrograms per cubic metre on 9 November. That is roughly 34 times the World Health Organization’s annual guideline.
Bad air does not affect everyone equally. Children, older people and people with asthma or heart disease feel it first. Also, traffic police, sanitation workers, vendors and delivery riders spend long hours outdoors. For them, a smoggy week is not a headline but a daily health risk.
Weather plays a big role too. In early winter, cool and still air traps smoke close to the ground. So the post-Diwali air pollution spike can stay for days, even after the celebrations end.
What can be done
Clean air needs action from many hands. Here are practical steps that institutions can take right now.
- Schools: Check the daily AQI before planning outdoor games and assemblies. Then move activities indoors on “very poor” and “severe” days.
- Hospitals: Prepare for more breathing complaints, especially among children and elderly patients. Also share simple masking and indoor-air advice with families.
- Municipalities: Stop open burning of garbage and leaves, because it adds smoke when the air is already still. In addition, cover construction dust and sprinkle water on busy roads.
- Workplaces: Give outdoor staff masks, shaded rest breaks and flexible shifts on the worst days.
- Industry and CSR teams: Fit emission controls on chimneys and boilers. Also fund cleaner air near schools, bus stops and hospital gates, where people gather and breathe the most.
For families, small steps help as well. Keep windows shut during the smoggiest hours, usually early morning and late evening. Then air out homes in the afternoon, when the air is often a little better. Finally, avoid burning anything at home or in the neighbourhood.
Key takeaways
- Delhi’s Diwali-day AQI of 376 was the highest since 2021.
- A day later, 14 of 51 stations reported “severe” air and none reported moderate or better.
- Calm winds and dry weather trapped the smoke, and visibility at Safdarjung fell to 50 metres.
- Schools, hospitals, cities and employers can all cut exposure with simple, timely steps.
Cleaner air is a shared job
Post-Diwali air pollution returns every winter, but it does not have to feel hopeless. When cities, institutions and citizens act together, the air near our homes, schools and workplaces can get better. At Stree Sanman, we build clean air solutions for exactly these places. Explore our work on climate action and clean air. Or partner with us to bring cleaner air to your campus or city.
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