Delhi AQI in parts of New Delhi surged after Diwali fireworks on Monday, with PM 2.5 levels reaching 879 micrograms per cubic metre in Mandir Marg early Monday morning. The reading was nearly 59 times the World Health Organization's recommended daily maximum.
Mandir Marg reading
IQAir cited data from a city government station for the Mandir Marg measurement. The same reading came about eight hours after the peak of the bursting fireworks, showing how quickly the air worsened after the festival night.
Residents of New Delhi live in a city of more than 30 million people, and the pollution spike hit one locality hard enough to push the air far beyond the World Health Organization benchmark. The source describes the capital as one of the world's most polluted, and the post-Diwali jump landed on top of an already strained winter air pattern.
Supreme Court and green firecrackers
This month, the Supreme Court allowed the limited use of so-called green firecrackers during Diwali. Yet restrictions on green firecrackers are routinely flouted in the city, and air quality deteriorated in Delhi on Monday after residents celebrating Diwali set off fireworks in violation of court orders.
Authorities had already implemented restrictions on traffic and construction to curb smog in New Delhi. Those limits target the season's other major pollution sources: vehicles account for 23 percent of Delhi's winter pollution, biomass burning including farm stubble fires contributes 20 percent, industry including coal-fired power plants contributes about nine percent, and secondary particles contribute 27 percent.
Delhi winter pollution
The fireworks spike landed amid a broader pollution problem that does not begin or end with Diwali. A 2024 study published in The Lancet Planetary Health estimated that 3.8 million deaths in India between 2009 and 2019 were linked to air pollution, putting the city's seasonal smog inside a national health burden that already runs deep.
For people in Mandir Marg and other hard-hit parts of New Delhi, the immediate signal is simple: the air can move from bad to extreme within hours after fireworks peak. The harder question is how much of the rise came from Diwali itself and how much came from the winter mix of traffic, farm smoke and industry that keeps Delhi trapped in haze long after the festival ends.
