As Tuesday dawned citizens of this heavily contaminated metropolis encountered inhaling dangerously toxic air that fell into the "alarming" category.
Several parts of the city recorded an air quality index above 500, which equals 10x the recommended level established by the global health authority.
Certain monitoring stations, concentrations of toxic particulate matter reached peaks of 1800, equating to 15-20x exceeding acceptable standards.
Since 2020, authorities had enforced a complete ban on the purchase and ignition of firecrackers during the Festival of Lights due to their significant contribution to the hazardous haze that blankets the capital as the cold season approaches.
Yet in recent months, the newly elected local administration appealed to the highest court to request a relaxation of the restrictions.
They proposed allowing "eco-friendly fireworks" – which have been questioned by conservation groups as being only roughly 30 percent reduced emissions – as a compromise between "tradition and ecological concerns".
To the disappointment of environmental and health campaigners, the court complied with the appeal, specifying that eco-friendly pyrotechnics could be set off during designated periods throughout the Diwali.
Throughout the festival evening, there was widespread disregard of the designated hours across the metropolis, with little regulation regarding whether the pyrotechnics being used were actually the more environmentally friendly version.
Numerous air quality sensors throughout Delhi showed pollution spiking around midnight to extremely hazardous levels recorded during Diwali in at least the past three years.
The proliferation of firecrackers during Diwali also initiated a dispute with adjacent Pakistan, with officials in Pakistan's Punjab pointing to worsening pollution levels in Lahore on contaminants traveling from India following the celebrations.
Extremely elevated readings of pollution in Delhi have remained as a serious challenge for more than 15 years, with the problem gradually deteriorating.
Around celebratory seasons, the levels of toxic particles in the atmosphere has been found to shoot up to significantly exceeding the peak levels ever measured in Beijing, which was previously viewed as the globally most contaminated metropolis.
The problem in the capital is attributed to a mix of multiple factors including transportation pollution, airborne particles, development work, rubbish burning and smoke from crop residue ignition in adjacent areas of neighboring agricultural zones.
Throughout these areas, rural residents regularly burn crop residue to prepare for next season, generating hazardous pollution that remains stagnant over the capital as cooler air sets in.
Public health and economic toll on the approximately 33 million inhabitants calling home the Delhi area is substantial, according to multiple studies.
This pollution leads to elevated rates of nervous system, heart and circulatory and respiratory disorders, and can even lead to cancer.
Environmental contamination is calculated to be accounting for ten thousand untimely fatalities annually in the capital.
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