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Tuesday brought residents of this heavily contaminated metropolis found themselves exposed to severely hazardous air that registered in the "severe" category.

Alarming Air Quality Levels

Multiple areas of Delhi registered an AQI exceeding 500, which represents ten times the safe threshold recommended by the World Health Organization.

Particular areas, concentrations of dangerous airborne particles reached peaks of 1800, amounting to fifteen to twenty times above acceptable limits.

Pyrotechnics Restrictions and New Developments

For the past four years, authorities had maintained a complete ban on the purchase and ignition of pyrotechnics during the Festival of Lights due to their major role to the deadly pollution that blankets the metropolis as winter approaches.

However in recent months, the newly elected local administration appealed to the highest court to seek a relaxation of the restrictions.

The suggestion was allowing "environmentally conscious pyrotechnics" – previously questioned by environmental experts as being only roughly 30 percent reduced emissions – as a balance between "cultural practices and ecological concerns".

Judicial Decision and Enforcement

Despite concerns of medical and ecological activists, the court complied with the request, mandating that environmentally conscious fireworks could be ignited during limited hours throughout the festival.

During the celebrations, there was considerable flouting of the regulated periods across the city, with insufficient regulation regarding whether the pyrotechnics being used were actually the eco-friendly type.

Many recording stations throughout the city recorded pollution spiking around midnight to some of the worst measurements seen during Diwali in at least three years.

Regional Effects

Extensive ignition of fireworks during Diwali also sparked a dispute with adjacent the neighboring country, with representatives in Pakistani the Punjab region partly blaming worsening air quality in their urban centers on contaminants traveling from across the border following the events.

Long-Standing Environmental Problem

The dangerously high concentrations of air contamination in the capital have remained as a serious issue for over a decade and a half, with the condition continuing to worsen.

Near the festival period, the amount of toxic particles in the atmosphere has been observed to increase dramatically to seventy percent above the worst readings ever measured in Beijing, which was once regarded as the planet's dirtiest metropolis.

Multiple Contamination Contributors

The situation in the city is resulting from a convergence of various sources including heavy vehicle emissions, construction debris, construction activities, waste incineration and pollutants from agricultural fires in adjacent states of farming communities.

In these regions, rural residents routinely set their fields on fire to expedite field preparation, creating dangerous smog that becomes contained over the metropolitan area as cooler air descends.

Health and Economic Toll

Both financial and medical consequences on the roughly thirty-three million inhabitants living in the metropolitan zone is significant, according to numerous research.

This pollution leads to increased incidence of nervous system, heart and circulatory and breathing disorders, and can result in oncological diseases.

Environmental contamination is projected to be responsible for approximately 10k premature fatalities annually in Delhi.