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As Tuesday dawned citizens of this heavily contaminated metropolis were faced with breathing severely hazardous air that fell into the "severe" category.

Record-Breaking Air Quality Readings

Several parts of Delhi registered an AQI over 500, which represents a tenfold increase over the recommended limit set by the WHO.

Particular areas, concentrations of PM2.5 and PM10 reached peaks of eighteen hundred, amounting to 15 to 20 times exceeding safe limits.

Pyrotechnics Restrictions and Current Policy Shifts

Beginning in 2020, authorities had maintained a comprehensive restriction on the purchase and ignition of pyrotechnics during the Festival of Lights due to their significant contribution to the deadly haze that covers the capital as the cold season sets in.

However recently, the current city administration appealed to the supreme court to seek a easing of the restrictions.

The suggestion was allowing "eco-friendly fireworks" – which have been questioned by environmental experts as being only approximately one-third lower impact – as a middle ground between "cultural practices and public health".

Legal Decision and Enforcement

Despite concerns of public health and environmental campaigners, the court agreed to the appeal, stipulating that environmentally conscious fireworks could be ignited during specific hours throughout the festival.

Throughout the festival evening, there was widespread violation of the time restrictions across the capital, with insufficient enforcement regarding whether the fireworks being used were actually the supposedly greener type.

Numerous recording stations throughout Delhi showed contamination reaching highest levels around the night hours to extremely hazardous readings seen during celebrations in at least three years.

Cross-Border Effects

The widespread use of firecrackers during the celebrations also initiated a dispute with adjacent the neighboring country, with authorities in Pakistan's Punjab pointing to worsening atmospheric conditions in their urban centers on contaminants originating in neighboring India following the events.

Persistent Environmental Issue

Alarmingly severe concentrations of pollution in the city have continued as a significant issue for fifteen-plus years, with the situation showing no improvement.

During Diwali, the concentration of dangerous particulate matter in the atmosphere has been observed to shoot up to significantly exceeding the most severe levels ever documented in Beijing, which was previously viewed as the world's most polluted metropolis.

Diverse Pollution Sources

This crisis in the city is caused by a combination of various sources including transportation pollution, airborne particles, development work, garbage fires and haze from crop residue ignition in nearby regions of farming communities.

Throughout these areas, rural residents regularly burn crop residue to prepare for next season, producing hazardous smog that remains stagnant over the capital as cooler air descends.

Public Health and Financial Consequences

The economic and health toll on the approximately 33 million residents residing in the metropolitan zone is significant, according to numerous studies.

This pollution results in high levels of neurological, cardiovascular and respiratory disorders, and can even lead to malignancies.

Air quality crisis is calculated to be causing 10,000 premature deaths per year in the capital.