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Tuesday brought citizens of this heavily contaminated metropolis found themselves exposed to extremely polluted air that fell into the "alarming" category.

Extremely High Air Quality Readings

Several parts of the capital registered an air quality index over 500, which translates to ten times the safe level established by the WHO.

In some locations, levels of dangerous airborne particles reached peaks of 1800, representing fifteen to twenty times above acceptable limits.

Fireworks Restrictions and New Policy Shifts

For the past four years, officials had enforced a complete ban on the purchase and ignition of firecrackers during the Festival of Lights due to their substantial impact to the deadly haze that engulfs the capital as colder weather begins.

Nevertheless recently, the current regional leadership petitioned the judicial authority to propose a modification of the ban.

The suggestion was allowing "environmentally conscious pyrotechnics" – historically questioned by conservation groups as being only roughly 30 percent lower impact – as a middle ground between "cultural practices and public health".

Legal Ruling and Implementation

Despite concerns of public health and environmental advocates, judicial authorities agreed to the request, stipulating that green firecrackers could be ignited during limited time windows throughout the Diwali.

Throughout the festival evening, there was considerable disregard of the regulated periods across the city, with insufficient regulation regarding whether the fireworks being used were actually the supposedly greener type.

Many air quality sensors throughout the city showed contamination reaching highest levels around midnight to the most severe readings seen during celebrations in at least three years.

International Consequences

Extensive ignition of pyrotechnics during Diwali also initiated a dispute with neighbouring the neighboring country, with representatives in Pakistan's Punjab partially attributing declining atmospheric conditions in the city of Lahore on contaminants traveling from across the border following the events.

Chronic Environmental Problem

Alarmingly severe levels of pollution in the city have persisted as a major challenge for more than 15 years, with the problem continuing to worsen.

Around celebratory seasons, the levels of hazardous particles in the atmosphere has been documented to spike to 70% higher the most severe readings ever recorded in the Chinese city, which was previously considered as the planet's dirtiest metropolis.

Various Pollution Sources

The problem in Delhi is attributed to a mix of multiple factors including automobile exhaust, airborne particles, construction activities, garbage fires and smoke from crop residue ignition in adjacent areas of Punjab and Haryana.

In these regions, farmers routinely ignite agricultural waste to clear them quickly, creating hazardous haze that then gets trapped over the metropolitan area as colder air arrives.

Medical and Financial Consequences

The economic and health toll on the approximately 33 million people calling home the metropolitan zone is enormous, according to numerous studies.

The contaminated air causes increased incidence of neurological, heart and circulatory and lung diseases, and can potentially cause malignancies.

Environmental contamination is calculated to be causing approximately 10k premature fatalities per year in the capital.