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Tuesday brought inhabitants of this heavily contaminated metropolis found themselves inhaling dangerously toxic air that fell into the "severe" range.

Record-Breaking Air Quality Measurements

Various sections of the city registered an air quality index exceeding 500, which equals ten times the safe level established by the WHO.

Certain monitoring stations, levels of PM2.5 and PM10 hit highs of 1800, amounting to 15 to 20 times above safe limits.

Firecracker Restrictions and Recent Changes

For the past four years, authorities had enforced a comprehensive restriction on the sale and use of pyrotechnics during the Festival of Lights due to their major role to the dangerous pollution that engulfs the metropolis as the cold season begins.

However in recent months, the newly elected local government appealed to the highest court to request a modification of the prohibition.

Officials advocated for allowing "green crackers" – previously doubted by environmental experts as being only approximately one-third reduced emissions – as a balance between "cultural practices and environment".

Court Decision and Enforcement

Despite concerns of public health and environmental activists, judicial authorities approved the appeal, specifying that green firecrackers could be ignited during limited hours throughout the celebrations.

During the celebrations, there was extensive disregard of the regulated periods across the metropolis, with insufficient regulation regarding whether the firecrackers being used were actually the supposedly greener version.

Many air quality sensors throughout the city recorded pollution spiking around the night hours to some of the worst levels observed during the festival in at least three years.

Regional Implications

The widespread use of pyrotechnics during the celebrations also initiated a dispute with neighbouring Pakistan, with officials in Pakistani the Punjab region partly blaming deteriorating atmospheric conditions in their urban centers on hazardous particles coming from across the border following the celebrations.

Persistent Pollution Problem

Extremely elevated levels of atmospheric toxins in the city have continued as a serious issue for fifteen-plus years, with the condition gradually deteriorating.

During the festival period, the amount of hazardous airborne contaminants in the air has been documented to shoot up to seventy percent above the most severe levels ever measured in China's capital, which was formerly considered as the planet's dirtiest city.

Multiple Pollution Factors

This crisis in Delhi is attributed to a combination of various sources including automobile exhaust, airborne particles, development work, waste incineration and pollutants from crop residue ignition in neighbouring areas of Punjab and Haryana.

Within these states, agricultural workers regularly set their fields on fire to expedite field preparation, producing toxic smog that becomes contained over the metropolitan area as colder air descends.

Public Health and Economic Impact

Both financial and medical toll on the approximately 33 million residents calling home the Delhi area is enormous, according to multiple investigations.

This pollution leads to increased incidence of neurological, cardiovascular and respiratory diseases, and can even lead to oncological diseases.

The pollution is calculated to be accounting for 10,000 premature fatalities each year in the city.