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As Tuesday dawned citizens of this heavily contaminated metropolis found themselves breathing severely hazardous air that fell into the "critical" category.

Extremely High Air Quality Measurements

Several parts of the capital recorded an air quality index exceeding 500, which equals a tenfold increase over the safe limit established by the World Health Organization.

In some locations, concentrations of toxic particulate matter reached peaks of 1,800, representing 15-20x exceeding acceptable standards.

Pyrotechnics Ban and Current Policy Shifts

For the past four years, officials had maintained a comprehensive restriction on the purchase and ignition of fireworks during the Festival of Lights due to their major role to the hazardous smog that engulfs the city as colder weather sets in.

Nevertheless in recent months, the newly elected city leadership approached the supreme court to request a modification of the prohibition.

The suggestion was allowing "eco-friendly fireworks" – historically criticized by environmental experts as being only roughly 30 percent reduced emissions – as a middle ground between "heritage and environment".

Judicial Ruling and Enforcement

Despite concerns of medical and ecological activists, judicial authorities approved the proposal, mandating that eco-friendly pyrotechnics could be set off during specific time windows throughout the Diwali.

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

Numerous monitoring devices throughout the capital registered pollution peaking around midnight to the most severe measurements seen during Diwali in at least the past three years.

Cross-Border Implications

The widespread use of fireworks during the celebrations also sparked a dispute with bordering Pakistan, with authorities in Pakistani Punjab province partly blaming worsening pollution levels in the city of Lahore on contaminants coming from neighboring India following the celebrations.

Chronic Pollution Crisis

The dangerously high concentrations of pollution in Delhi have persisted as a major challenge for over a decade and a half, with the condition continuing to worsen.

Near celebratory seasons, the amount of dangerous particles in the air has been found to increase dramatically to 70% higher the peak readings ever recorded in Beijing, which was previously viewed as the globally most contaminated city.

Diverse Contamination Sources

The situation in the city is resulting from a convergence of different contributors including automobile exhaust, construction debris, construction activities, garbage fires and smoke from farm burning in adjacent regions of farming communities.

Within these states, farmers illegally set their fields on fire to clear them quickly, producing dangerous pollution that becomes contained over the metropolitan area as colder air sets in.

Public Health and Financial Toll

Public health and economic consequences on the roughly thirty-three million inhabitants living in the metropolitan zone is enormous, according to numerous studies.

These hazardous conditions causes increased incidence of nervous system, heart and circulatory and breathing conditions, and can result in oncological diseases.

Air quality crisis is estimated to be accounting for approximately 10k premature mortalities per year in the capital.