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

Extremely High Air Quality Measurements

Multiple areas of the city showed an air quality index above 500, which equals ten times the recommended limit set by the WHO.

Certain monitoring stations, levels of PM2.5 and PM10 hit highs of 1,800, equating to 15 to 20 times higher than acceptable limits.

Firecracker Restrictions and Current Changes

For the past four years, authorities had enforced a total prohibition on the sale and use of fireworks during the Festival of Lights due to their significant contribution to the dangerous smog that covers the metropolis as colder weather approaches.

Nevertheless earlier this year, the current regional administration petitioned the highest court to propose a easing of the restrictions.

The suggestion was allowing "environmentally conscious pyrotechnics" – historically criticized by environmentalists as being only approximately one-third less polluting – as a middle ground between "cultural practices and ecological concerns".

Legal Ruling and Implementation

Despite concerns of medical and ecological advocates, the court agreed to the proposal, mandating that eco-friendly pyrotechnics could be set off during limited time windows throughout the Diwali.

Throughout the festival evening, there was extensive flouting of the designated hours across the capital, with minimal monitoring regarding whether the fireworks being used were actually the supposedly greener variety.

Many monitoring devices throughout the capital showed pollution peaking around the night hours to the most severe measurements seen during celebrations in at least the past three years.

Regional Consequences

Extensive ignition of pyrotechnics during the celebrations also sparked a blame game with adjacent Pakistan, with officials in Pakistan's Punjab pointing to declining pollution levels in the city of Lahore on contaminants originating in neighboring India following the festivities.

Persistent Environmental Crisis

The dangerously high readings of pollution in Delhi have continued as a major challenge for more than 15 years, with the condition continuing to worsen.

Around celebratory seasons, the concentration of hazardous particulate matter in the environment has been documented to increase dramatically to 70% higher the most severe levels ever measured in the Chinese city, which was once considered as the planet's dirtiest urban center.

Multiple Contamination Contributors

The problem in the capital is resulting from a combination of different contributors including automobile exhaust, construction debris, construction activities, waste incineration and pollutants from agricultural fires in adjacent regions of Punjab and Haryana.

Throughout these areas, agricultural workers routinely burn crop residue to expedite field preparation, producing toxic smog that then gets trapped over the city as winter air descends.

Medical and Financial Consequences

The economic and health toll on the roughly thirty-three million residents residing in the Delhi area is significant, according to various investigations.

The contaminated air results in increased incidence of neurological, cardiovascular and lung conditions, and can potentially cause malignancies.

Environmental contamination is projected to be accounting for 10,000 premature fatalities per year in Delhi.