Tuesday brought citizens of this heavily contaminated metropolis were faced with breathing severely hazardous air that fell into the "critical" level.
Multiple areas of the capital registered an AQI exceeding 500, which equals 10x the healthy threshold established by the World Health Organization.
Particular areas, readings of dangerous airborne particles hit highs of 1,800, equating to 15-20x higher than healthy standards.
Beginning in 2020, officials had implemented a total prohibition on the sale and use of fireworks during celebrations due to their substantial impact to the deadly haze that engulfs the city as colder weather approaches.
However in recent months, the recently formed local leadership appealed to the supreme court to propose a relaxation of the restrictions.
They proposed allowing "eco-friendly fireworks" – which have been questioned by environmentalists as being only about 30% less polluting – as a compromise between "heritage and ecological concerns".
To the disappointment of public health and environmental campaigners, judges agreed to the appeal, stipulating that eco-friendly pyrotechnics could be ignited during specific time windows throughout the Diwali.
On Monday night, there was widespread flouting of the regulated periods across the capital, with little monitoring regarding whether the pyrotechnics being used were actually the more environmentally friendly variety.
Several air quality sensors throughout Delhi recorded contamination spiking around late evening to extremely hazardous levels observed during Diwali in at least the past three years.
The widespread use of pyrotechnics during Diwali also initiated a dispute with bordering Pakistan, with officials in Pakistan's Punjab partially attributing deteriorating atmospheric conditions in the city of Lahore on contaminants coming from India following the celebrations.
Extremely elevated levels of air contamination in the capital have persisted as a significant issue for more than 15 years, with the problem showing no improvement.
Around celebratory seasons, the amount of dangerous airborne contaminants in the air has been observed to increase dramatically to significantly exceeding the worst records ever documented in Beijing, which was formerly viewed as the planet's dirtiest city.
The situation in the capital is resulting from a mix of various sources including heavy vehicle emissions, construction debris, building projects, waste incineration and haze from farm burning in adjacent states of farming communities.
Throughout these areas, rural residents regularly ignite agricultural waste to expedite field preparation, creating dangerous haze that remains stagnant over the capital as colder air descends.
The economic and health toll on the nearly 33 million people residing in the Delhi area is enormous, according to numerous research.
The contaminated air results in elevated rates of neurological, cardiovascular and breathing disorders, and can potentially cause cancer.
Environmental contamination is estimated to be responsible for 10,000 early mortalities per year in the capital.
A seasoned gaming analyst with over a decade of experience in casino entertainment and slot machine technology.