Tuesday brought citizens of this heavily contaminated metropolis encountered inhaling extremely polluted air that registered in the "alarming" category.
Multiple areas of the city showed an AQI over 500, which represents a tenfold increase over the healthy limit set by the global health authority.
In some locations, levels of toxic particulate matter reached peaks of eighteen hundred, equating to 15 to 20 times higher than healthy standards.
For the past four years, the government had implemented a comprehensive restriction on the distribution and bursting of firecrackers during Diwali due to their major role to the deadly smog that engulfs the capital as colder weather approaches.
Nevertheless earlier this year, the newly elected city administration appealed to the judicial authority to request a easing of the prohibition.
The suggestion was allowing "eco-friendly fireworks" – previously questioned by environmentalists as being only about 30% less polluting – as a middle ground between "cultural practices and ecological concerns".
Much to the frustration of medical and ecological advocates, judges approved the request, stipulating that eco-friendly pyrotechnics could be used during specific periods throughout the festival.
On Monday night, there was considerable violation of the time restrictions across the metropolis, with little monitoring regarding whether the firecrackers being used were actually the more environmentally friendly version.
Several monitoring devices throughout Delhi recorded contamination reaching highest levels around late evening to extremely hazardous readings observed during Diwali in at least three years.
The proliferation of firecrackers during the festival also triggered a dispute with neighbouring Pakistan, with authorities in Pakistani Punjab pointing to declining atmospheric conditions in the city of Lahore on pollutants coming from across the border following the festivities.
Alarmingly severe levels of atmospheric toxins in the city have persisted as a serious issue for fifteen-plus years, with the condition continuing to worsen.
Near the festival period, the levels of hazardous airborne contaminants in the air has been found to shoot up to significantly exceeding the most severe levels ever recorded in the Chinese city, which was previously regarded as the world's most polluted urban center.
This crisis in the capital is resulting from a convergence of various sources including automobile exhaust, dust, building projects, rubbish burning and pollutants from farm burning in neighbouring areas of farming communities.
In these regions, farmers routinely set their fields on fire to prepare for next season, generating hazardous smog that then gets trapped over the metropolitan area as winter air descends.
Public health and economic impact on the roughly thirty-three million residents living in the Delhi area is enormous, according to various research.
This pollution leads to increased incidence of neurological, heart and circulatory and respiratory conditions, and can potentially cause oncological diseases.
Environmental contamination is calculated to be causing ten thousand early fatalities per year in the city.
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