ClimateThursday, November 12, 20261 min read

Delhi’s Diwali pollution started before the fireworks

By Economic Times · Published by Everything Blog

In short

Analyses by the Centre for Science and Environment revealed that surrounding districts generated over half of the city's particulate load in early November. Within urban boundaries, vehicular exhaust remained the largest internal contributor alongside industrial and residential sources. While nighttime firecrackers caused severe localized spikes, stagnant weather patterns and low wind speeds compounded the crisis by trapping chronic year-round emissions.

Key points

Festive fireworks act as an acute tipping point that exacerbates pre-existing year-round…: Festive fireworks act as an acute tipping point that exacerbates pre-existing year-round air contamination.
Emergency anti-pollution frameworks provide limited relief when adverse weather condition…: Emergency anti-pollution frameworks provide limited relief when adverse weather conditions and stagnant air trap particulates.
Policy interventions have achieved minor multi-year progress, but regional pollution rema…: Policy interventions have achieved minor multi-year progress, but regional pollution remains well above safe health limits.

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The finding complicates the usual explanation for Delhi’s winter pollution, that the air quality crisis is mainly the result of Diwali fireworks and stubble burning around October/November. The capital city enters winter with pollution from vehicles, construction, industries, waste burning and neighbouring NCR districts already trapped in the air.

“Diwali pollution is an annual tipping point, but elevated particulate levels before the festival this year show that baseline pollution is higher than in previous years,” CSE executive director Anumita Roychowdhury said.

The smoke was already building

CSE compared air quality data, pollution source estimates and traffic conditions during October and November 2026. It found that the average PM2.5 level in the week before Diwali was 236 micrograms per cubic metre, compared with 120 in 2025 and 179 in 2024.PM2.5 refers to fine particles in the air that are 2.5 micrometres or smaller. They can come from vehicle exhaust, industrial emissions, smoke from fires and burning, and can travel deep into the lungs.

According to the World Health Organization’s 2021 air quality guidelines, PM2.5…

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Key Points

Festive fireworks act as an acute tipping point that exacerbates pre-existing year-round…: Festive fireworks act as an acute tipping point that exacerbates pre-existing year-round air contamination.
Emergency anti-pollution frameworks provide limited relief when adverse weather condition…: Emergency anti-pollution frameworks provide limited relief when adverse weather conditions and stagnant air trap particulates.
Policy interventions have achieved minor multi-year progress, but regional pollution rema…: Policy interventions have achieved minor multi-year progress, but regional pollution remains well above safe health limits.

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AI Analysis

Tone

Negative

In short

Key Points

Festive fireworks act as an acute tipping point that exacerbates pre-existing year-round…: Festive fireworks act as an acute tipping point that exacerbates pre-existing year-round air contamination.
Emergency anti-pollution frameworks provide limited relief when adverse weather condition…: Emergency anti-pollution frameworks provide limited relief when adverse weather conditions and stagnant air trap particulates.
Policy interventions have achieved minor multi-year progress, but regional pollution rema…: Policy interventions have achieved minor multi-year progress, but regional pollution remains well above safe health limits.

Topics

Climate

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Delhi’s Diwali pollution started before the fireworks

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