Tuesday brought inhabitants of the planet's dirtiest urban center were faced with breathing dangerously toxic air that fell into the "severe" category.
Various sections of Delhi showed an air quality index above 500, which translates to ten times the safe limit set by the WHO.
In some locations, levels of PM2.5 and PM10 reached peaks of 1,800, equating to fifteen to twenty times exceeding healthy limits.
Beginning in 2020, the government had maintained a comprehensive restriction on the sale and use of firecrackers during Diwali due to their major role to the dangerous pollution that engulfs the capital as winter sets in.
Nevertheless in recent months, the recently formed city government appealed to the supreme court to request a easing of the restrictions.
The suggestion was allowing "environmentally conscious pyrotechnics" – historically doubted by environmentalists as being only approximately one-third lower impact – as a balance between "tradition and environment".
To the disappointment of medical and ecological campaigners, the court agreed to the proposal, mandating that green firecrackers could be ignited during limited periods throughout the celebrations.
Throughout the festival evening, there was widespread flouting of the time restrictions across the metropolis, with insufficient regulation regarding whether the firecrackers being used were actually the eco-friendly type.
Several air quality sensors throughout Delhi recorded pollution spiking around the night hours to some of the worst levels seen during the festival in at least recent memory.
The proliferation of fireworks during the festival also initiated a blame game with bordering the neighboring country, with officials in Pakistan's the Punjab region partially attributing declining air quality in the city of Lahore on pollutants originating in neighboring India following the events.
Alarmingly severe concentrations of atmospheric toxins in Delhi have remained as a serious challenge for over a decade and a half, with the condition showing no improvement.
Around celebratory seasons, the concentration of dangerous particles in the atmosphere has been observed to shoot up to seventy percent above the worst readings ever documented in the Chinese city, which was once considered as the planet's dirtiest metropolis.
The situation in Delhi is caused by a convergence of various sources including automobile exhaust, construction debris, construction activities, rubbish burning and pollutants from farm burning in nearby areas of neighboring agricultural zones.
Throughout these areas, agricultural workers routinely set their fields on fire to clear them quickly, generating toxic haze that becomes contained over the capital as winter air arrives.
Both financial and medical impact on the roughly thirty-three million residents residing in the metropolitan zone is significant, according to multiple research.
The contaminated air leads to elevated rates of neurological, cardiovascular and breathing diseases, and can even lead to oncological diseases.
Environmental contamination is estimated to be causing 10,000 early fatalities each year in the capital.
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