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Tuesday brought citizens of this heavily contaminated metropolis were faced with breathing extremely polluted air that fell into the "severe" range.

Alarming Pollution Readings

Various sections of the capital registered an AQI over 500, which represents a tenfold increase over the recommended threshold established by the WHO.

In some locations, levels of PM2.5 and PM10 soared to of 1,800, amounting to 15 to 20 times higher than healthy levels.

Fireworks Restrictions and New Policy Shifts

For the past four years, authorities had enforced a comprehensive restriction on the distribution and bursting of pyrotechnics during the Festival of Lights due to their substantial impact to the deadly smog that covers the capital as the cold season sets in.

However earlier this year, the current regional administration approached the supreme court to seek a modification of the prohibition.

The suggestion was allowing "green crackers" – previously criticized by environmental experts as being only roughly 30 percent lower impact – as a balance between "cultural practices and public health".

Court Decision and Implementation

Despite concerns of public health and environmental advocates, judicial authorities approved the proposal, stipulating that eco-friendly pyrotechnics could be used during designated periods throughout the celebrations.

During the celebrations, there was extensive disregard of the designated hours across the capital, with minimal regulation regarding whether the firecrackers being used were actually the eco-friendly variety.

Numerous air quality sensors throughout Delhi showed contamination spiking around the night hours to extremely hazardous measurements seen during Diwali in at least three years.

International Implications

The widespread use of fireworks during the festival also sparked a blame game with neighbouring the neighboring country, with authorities in Pakistan's Punjab province partially attributing deteriorating air quality in their urban centers on contaminants originating in across the border following the celebrations.

Persistent Environmental Issue

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

Near Diwali, the levels of dangerous particles in the environment has been found to increase dramatically to seventy percent above the most severe levels ever documented in the Chinese city, which was formerly viewed as the globally most contaminated urban center.

Diverse Pollution Contributors

The situation in Delhi is attributed to a combination of multiple factors including heavy vehicle emissions, dust, construction activities, waste incineration and smoke from crop residue ignition in nearby states of neighboring agricultural zones.

Within these states, rural residents routinely burn crop residue to clear them quickly, creating toxic haze that remains stagnant over the metropolitan area as colder air descends.

Medical and Economic Toll

The economic and health impact on the nearly 33 million inhabitants residing in the capital region is enormous, according to numerous studies.

The contaminated air leads to elevated rates of nervous system, heart and circulatory and respiratory disorders, and can potentially cause malignancies.

Air quality crisis is estimated to be responsible for 10,000 premature mortalities each year in the city.