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On Tuesday morning inhabitants of this heavily contaminated metropolis found themselves breathing extremely polluted air that was classified as the "alarming" category.

Extremely High Air Quality Measurements

Various sections of Delhi showed an pollution measurement exceeding 500, which represents a tenfold increase over the recommended level set by the World Health Organization.

Certain monitoring stations, concentrations of PM2.5 and PM10 soared to of 1,800, representing 15-20x higher than safe levels.

Firecracker Ban and Recent Changes

Since 2020, authorities had implemented a comprehensive restriction on the sale and use of firecrackers during the Festival of Lights due to their major role to the deadly smog that covers the capital as winter sets in.

Yet earlier this year, the recently formed city government petitioned the highest court to seek a relaxation of the prohibition.

Officials advocated for allowing "environmentally conscious pyrotechnics" – previously doubted by environmentalists as being only roughly 30 percent lower impact – as a balance between "tradition and environment".

Judicial Ruling and Enforcement

Despite concerns of public health and environmental activists, judicial authorities complied with the request, mandating that environmentally conscious fireworks could be set off during designated hours throughout the Diwali.

On Monday night, there was extensive disregard of the time restrictions across the capital, with insufficient enforcement regarding whether the pyrotechnics being used were actually the eco-friendly version.

Numerous air quality sensors throughout the city registered air quality spiking around late evening to some of the worst measurements observed during the festival in at least three years.

Regional Effects

Extensive ignition of fireworks during the celebrations also sparked a blame game with adjacent Pakistan, with authorities in Pakistani Punjab pointing to worsening atmospheric conditions in their urban centers on pollutants originating in across the border following the events.

Chronic Pollution Crisis

Extremely elevated readings of air contamination in the city have remained as a significant issue for more than 15 years, with the condition continuing to worsen.

During the festival period, the amount of hazardous particles in the air has been found to spike to seventy percent above the most severe levels ever measured in China's capital, which was formerly viewed as the planet's dirtiest metropolis.

Multiple Contamination Sources

The situation in the capital is resulting from a convergence of various sources including transportation pollution, airborne particles, development work, waste incineration and smoke from farm burning in neighbouring regions of Punjab and Haryana.

Within these states, farmers routinely set their fields on fire to prepare for next season, generating hazardous haze that remains stagnant over the city as winter air arrives.

Public Health and Economic Toll

The economic and health impact on the nearly 33 million inhabitants residing in the metropolitan zone is enormous, according to numerous investigations.

The contaminated air causes increased incidence of nervous system, heart and circulatory and respiratory disorders, and can result in cancer.

Environmental contamination is projected to be accounting for ten thousand untimely fatalities annually in Delhi.