Tuesday brought residents of this heavily contaminated metropolis were faced with exposed to severely hazardous air that fell into the "alarming" range.
Several parts of the city registered an AQI above 500, which represents a tenfold increase over the recommended level established by the WHO.
Particular areas, readings of toxic particulate matter reached peaks of 1800, amounting to 15 to 20 times above healthy levels.
Beginning in 2020, the government had enforced a total prohibition on the sale and use of fireworks during the Festival of Lights due to their significant contribution to the hazardous smog that covers the city as winter begins.
Nevertheless in recent months, the current regional leadership petitioned the highest court to request a modification of the restrictions.
They proposed allowing "green crackers" – historically doubted by environmentalists as being only roughly 30 percent less polluting – as a middle ground between "heritage and environment".
Despite concerns of public health and environmental activists, judges agreed to the appeal, specifying that green firecrackers could be ignited during specific time windows throughout the celebrations.
On Monday night, there was considerable violation of the time restrictions across the capital, with minimal monitoring regarding whether the firecrackers being used were actually the eco-friendly type.
Many monitoring devices throughout Delhi recorded pollution spiking around the night hours to the most severe levels seen during celebrations in at least the past three years.
Extensive ignition of firecrackers during Diwali also triggered a blame game with bordering Pakistan, with representatives in Pakistan's Punjab province partially attributing worsening pollution levels in the city of Lahore on pollutants originating in India following the festivities.
Alarmingly severe concentrations of pollution in the city have remained as a major challenge for more than 15 years, with the problem continuing to worsen.
Around the festival period, the levels of toxic particles in the environment has been found to shoot up to 70% higher the most severe records ever measured in Beijing, which was previously regarded as the planet's dirtiest metropolis.
The problem in the capital is caused by a convergence of multiple factors including automobile exhaust, dust, building projects, waste incineration and pollutants from crop residue ignition in neighbouring regions of neighboring agricultural zones.
In these regions, agricultural workers routinely ignite agricultural waste to clear them quickly, producing toxic smog that then gets trapped over the city as winter air descends.
Both financial and medical consequences on the roughly thirty-three million residents calling home the capital region is substantial, according to numerous investigations.
These hazardous conditions leads to increased incidence of neurological, heart and circulatory and breathing diseases, and can result in malignancies.
Air quality crisis is projected to be accounting for ten thousand untimely mortalities per year in Delhi.
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