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As Tuesday dawned residents of this heavily contaminated metropolis found themselves exposed to severely hazardous air that fell into the "severe" range.

Extremely High Pollution Levels

Various sections of the city registered an AQI over 500, which represents a tenfold increase over the healthy limit recommended by the global health authority.

Particular areas, concentrations of dangerous airborne particles reached peaks of 1,800, equating to 15-20x higher than healthy limits.

Pyrotechnics Prohibition and Current Developments

Since 2020, the government had maintained a total prohibition on the sale and use of pyrotechnics during the Festival of Lights due to their substantial impact to the hazardous haze that covers the metropolis as colder weather sets in.

Nevertheless earlier this year, the newly elected regional administration appealed to the supreme court to propose a relaxation of the prohibition.

The suggestion was allowing "environmentally conscious pyrotechnics" – previously criticized by environmentalists as being only roughly 30 percent less polluting – as a compromise between "cultural practices and environment".

Court Verdict and Enforcement

Much to the frustration of medical and ecological campaigners, judges complied with the request, mandating that green firecrackers could be used during designated time windows throughout the celebrations.

On Monday night, there was widespread violation of the designated hours across the capital, with minimal enforcement regarding whether the pyrotechnics being used were actually the supposedly greener version.

Many air quality sensors throughout the capital registered air quality peaking around the night hours to some of the worst levels observed during Diwali in at least recent memory.

International Consequences

The widespread use of pyrotechnics during Diwali also initiated a dispute with bordering Pakistan, with authorities in Pakistani Punjab province partially attributing deteriorating pollution levels in the city of Lahore on hazardous particles coming from neighboring India following the festivities.

Persistent Pollution Problem

The dangerously high readings of air contamination in the capital have continued as a significant issue for over a decade and a half, with the situation gradually deteriorating.

Near celebratory seasons, the amount of toxic airborne contaminants in the environment has been found to spike to significantly exceeding the most severe records ever recorded in China's capital, which was once considered as the planet's dirtiest city.

Various Pollution Sources

This crisis in the city is caused by a combination of different contributors including automobile exhaust, dust, building projects, rubbish burning and pollutants from crop residue ignition in nearby regions of farming communities.

Throughout these areas, agricultural workers illegally burn crop residue to prepare for next season, creating hazardous pollution that then gets trapped over the metropolitan area as colder air sets in.

Medical and Economic Toll

The economic and health impact on the nearly 33 million people living in the Delhi area is substantial, according to multiple investigations.

This pollution results in high levels of nervous system, cardiovascular and lung disorders, and can even lead to malignancies.

Air quality crisis is projected to be responsible for ten thousand premature fatalities each year in Delhi.