As Tuesday dawned citizens of this heavily contaminated metropolis found themselves breathing extremely polluted air that fell into the "critical" range.
Various sections of Delhi showed an AQI above 500, which translates to a tenfold increase over the safe threshold established by the WHO.
In some locations, concentrations of dangerous airborne particles reached peaks of 1800, equating to 15 to 20 times higher than healthy levels.
Since 2020, the government had enforced a total prohibition on the purchase and ignition of firecrackers during the Festival of Lights due to their substantial impact to the deadly pollution that engulfs the city as colder weather approaches.
However recently, the newly elected city leadership appealed to the supreme court to propose a modification of the restrictions.
They proposed allowing "eco-friendly fireworks" – which have been questioned by environmental experts as being only roughly 30 percent reduced emissions – as a compromise between "tradition and public health".
To the disappointment of public health and environmental advocates, judicial authorities complied with the proposal, mandating that eco-friendly pyrotechnics could be set off during specific hours throughout the celebrations.
On Monday night, there was extensive flouting of the regulated periods across the city, with insufficient monitoring regarding whether the firecrackers being used were actually the more environmentally friendly type.
Several monitoring devices throughout the city registered contamination reaching highest levels around late evening to extremely hazardous measurements observed during Diwali in at least recent memory.
The widespread use of firecrackers during Diwali also sparked a dispute with adjacent the neighboring country, with representatives in Pakistan's Punjab pointing to worsening air quality in the city of Lahore on hazardous particles traveling from neighboring India following the events.
Alarmingly severe readings of pollution in the capital have persisted as a major challenge for fifteen-plus years, with the problem showing no improvement.
During the festival period, the amount of hazardous airborne contaminants in the environment has been found to increase dramatically to seventy percent above the worst levels ever measured in Beijing, which was previously regarded as the globally most contaminated urban center.
This crisis in the city is resulting from a convergence of various sources including automobile exhaust, airborne particles, building projects, rubbish burning and haze from crop residue ignition in neighbouring areas of farming communities.
In these regions, agricultural workers illegally ignite agricultural waste to expedite field preparation, creating toxic haze that remains stagnant over the metropolitan area as colder air descends.
Public health and economic impact on the nearly 33 million residents living in the metropolitan zone is significant, according to various research.
The contaminated air results in elevated rates of neurological, heart and circulatory and respiratory conditions, and can even lead to oncological diseases.
The pollution is estimated to be responsible for approximately 10k untimely fatalities per year in the city.
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