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Tuesday brought residents of this heavily contaminated metropolis were faced with inhaling severely hazardous air that registered in the "severe" category.

Record-Breaking Pollution Measurements

Multiple areas of the capital registered an pollution measurement above 500, which translates to a tenfold increase over the safe level established by the WHO.

In some locations, concentrations of PM2.5 and PM10 hit highs of 1800, amounting to fifteen to twenty times higher than healthy levels.

Pyrotechnics Restrictions and Current Policy Shifts

Beginning in 2020, officials had enforced a total prohibition on the distribution and bursting of fireworks during Diwali due to their significant contribution to the hazardous haze that engulfs the city as the cold season sets in.

However in recent months, the newly elected city leadership approached the judicial authority to request a easing of the restrictions.

They proposed allowing "environmentally conscious pyrotechnics" – which have been questioned by conservation groups as being only about 30% less polluting – as a middle ground between "tradition and public health".

Legal Decision and Reality

Despite concerns of medical and ecological advocates, judicial authorities complied with the request, mandating that environmentally conscious fireworks could be set off during limited time windows throughout the festival.

During the celebrations, there was widespread violation of the regulated periods across the city, with minimal monitoring regarding whether the fireworks being used were actually the eco-friendly variety.

Numerous air quality sensors throughout the capital showed contamination peaking around late evening to the most severe readings observed during celebrations in at least three years.

Cross-Border Effects

Extensive ignition of fireworks during the celebrations also triggered a dispute with bordering the neighboring country, with officials in Pakistani Punjab partly blaming declining pollution levels in their urban centers on hazardous particles originating in across the border following the events.

Chronic Pollution Crisis

Alarmingly severe readings of pollution in the capital have remained as a significant issue for more than 15 years, with the situation showing no improvement.

Around Diwali, the concentration of toxic airborne contaminants in the environment has been documented to shoot up to seventy percent above the worst readings ever documented in China's capital, which was once viewed as the world's most polluted urban center.

Multiple Pollution Sources

The situation in the capital is attributed to a combination of multiple factors including automobile exhaust, construction debris, construction activities, rubbish burning and smoke from crop residue ignition in adjacent states of Punjab and Haryana.

Throughout these areas, farmers illegally ignite agricultural waste to expedite field preparation, producing hazardous pollution that then gets trapped over the city as colder air sets in.

Health and Economic Impact

The economic and health toll on the nearly 33 million residents calling home the capital region is enormous, according to multiple research.

The contaminated air results in high levels of nervous system, cardiovascular and breathing diseases, and can potentially cause malignancies.

The pollution is projected to be accounting for 10,000 early fatalities annually in the capital.