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PHOTOS: After Diwali Fireworks, Smog Shrouds New Delhi

An Indian worker sweeps a street in a cloud of choking smog in New Delhi on Monday, the day after fireworks for the Diwali festival. After millions of firecrackers were lit, New Delhi's air pollutants shot up far higher than normal levels.
Money Sharma
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AFP/Getty Images
An Indian worker sweeps a street in a cloud of choking smog in New Delhi on Monday, the day after fireworks for the Diwali festival. After millions of firecrackers were lit, New Delhi's air pollutants shot up far higher than normal levels.

On Sunday, India celebrated Diwali with lamps, candles, feasting and fireworks. Now, a day after fireworks for the festival of lights, New Delhi is choked with a thick, dark smog.

The celebrations sharply exacerbated the city's perpetual pollution problems — the BBC reports that in the wake of the fireworks, levels of extremely small particulate matter more than doubled over the course of a few hours.

Those tiny particles, called PM2.5, can travel into the lungs and get stuck there, posing a serious health risk.

The BBC reports that by Monday, PM2.5 levels had exceeded 30 times the World Health Organization's recommendation for average daily exposure.

Photos of India's capital before and after the light show for Diwali, which lasts for five days, show landmarks first visible through the city's smog, then nearly erased by the spike in pollution.

Residents of New Delhi have been advised to remain indoors Monday, The Associated Press reports, with special cautions for the young, elderly and those with health problems.

Anumita Roychowdhury, the executive director of a New Delhi-based think tank called the Centre for Science and Environment, tells The Guardian there are several reasons for the severe Diwali pollution.

Weather plays a factor — in winter, cooler temperatures and slower winds prevent the smoke from being blown away. India's Central Pollution Control Board says wind speeds were lower for this Diwali than they were for last year's festival.

A girl plays with firecrackers during Diwali on Sunday in New Delhi. Hindus light lamps, wear new clothes, exchange sweets and gifts and pray to the goddess Lakshmi during Diwali, the festival of lights.
Tsering Topgyal / AP
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AP
A girl plays with firecrackers during Diwali on Sunday in New Delhi. Hindus light lamps, wear new clothes, exchange sweets and gifts and pray to the goddess Lakshmi during Diwali, the festival of lights.

Then there's the baseline smog problem. "Delhi's air remains so polluted throughout the year that it doesn't really have room for additional pollution during Diwali," Roychowdhury tells the Guardian.

"New Delhi's air pollution, among the world's worst, spikes every winter because of the season's weak winds and countless garbage fires set alight to help people stay warm," the AP reports. Agricultural fires in nearby fields also contribute to the problem.

"New Delhi has tried to clean its air," the wire service adds. "It has barred cargo trucks from city streets, required drivers to buy newer cars that meet higher emissions standards, and carried out several weeks of experimental traffic control, limiting the number of cars on the road. But other pollution sources, including construction dust and cooking fires fueled by wood or kerosene, continue unabated."

The New Delhi skyline is seen enveloped in smog on Friday (top) when pollution levels were already far above WHO recommendations, and on Monday (bottom) after fireworks for the Diwali festival sharply exacerbated the problem.
Altaf Qadri (top) and Tsering Topgyal (bottom) / AP
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AP
The New Delhi skyline is seen enveloped in smog on Friday (top) when pollution levels were already far above WHO recommendations, and on Monday (bottom) after fireworks for the Diwali festival sharply exacerbated the problem.

In the run-up to Diwali, several campaigns called for residents to cut back on fireworks, the BBC reports. "Similar initiatives in the past have got little attention," the network says.

A new report from UNICEF says 2 billion children live in areas with elevated air pollution, with nearly a third of them in South Asia. The report also says some 300 million kids are exposed to air pollution levels that are toxic, or six times higher than WHO standards.

Copyright 2023 NPR. To see more, visit https://www.npr.org.

Camila Domonoske
Camila Flamiano Domonoske covers cars, energy and the future of mobility for NPR's Business Desk.