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Tuesday brought residents of the planet's dirtiest urban center encountered breathing dangerously toxic air that registered in the "critical" level.

Extremely High Pollution Levels

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

In some locations, readings of dangerous airborne particles reached peaks of 1800, amounting to 15-20x exceeding acceptable standards.

Pyrotechnics Restrictions and Recent Policy Shifts

Beginning in 2020, the government had enforced a comprehensive restriction on the purchase and ignition of pyrotechnics during Diwali due to their substantial impact to the deadly smog that engulfs the capital as the cold season begins.

However in recent months, the newly elected regional leadership petitioned the judicial authority to propose a relaxation of the prohibition.

Officials advocated for allowing "green crackers" – historically questioned by conservation groups as being only approximately one-third reduced emissions – as a balance between "heritage and environment".

Court Ruling and Enforcement

Despite concerns of public health and environmental campaigners, the court complied with the request, stipulating that eco-friendly pyrotechnics could be used during limited time windows throughout the celebrations.

Throughout the festival evening, there was considerable flouting of the regulated periods across the metropolis, with little regulation regarding whether the firecrackers being used were actually the supposedly greener version.

Several recording stations throughout the capital recorded pollution reaching highest levels around midnight to some of the worst readings recorded during the festival in at least three years.

Regional Consequences

Extensive ignition of firecrackers during the festival also triggered a dispute with adjacent Pakistan, with officials in Pakistani Punjab partly blaming deteriorating pollution levels in the city of Lahore on pollutants traveling from India following the events.

Persistent Pollution Problem

The dangerously high levels of pollution in Delhi have persisted as a major challenge for fifteen-plus years, with the problem continuing to worsen.

Around Diwali, the concentration of hazardous particulate matter in the environment has been documented to shoot up to seventy percent above the worst readings ever measured in Beijing, which was formerly regarded as the planet's dirtiest urban center.

Multiple Pollution Factors

The problem in Delhi is resulting from a convergence of different contributors including automobile exhaust, construction debris, construction activities, waste incineration and smoke from crop residue ignition in neighbouring states of neighboring agricultural zones.

In these regions, farmers routinely burn crop residue to prepare for next season, generating hazardous smog that then gets trapped over the city as winter air sets in.

Health and Financial Toll

Public health and economic toll on the nearly 33 million residents calling home the Delhi area is substantial, according to multiple research.

These hazardous conditions leads to elevated rates of nervous system, cardiovascular and respiratory conditions, and can result in malignancies.

The pollution is projected to be causing 10,000 premature deaths each year in Delhi.