On Tuesday morning citizens of this heavily contaminated metropolis encountered inhaling extremely polluted air that was classified as the "severe" category.
Various sections of the city registered an pollution measurement over 500, which represents a tenfold increase over the safe threshold recommended by the global health authority.
Particular areas, concentrations of PM2.5 and PM10 reached peaks of 1800, representing 15 to 20 times higher than safe levels.
Since 2020, officials had enforced a complete ban on the distribution and bursting of firecrackers during celebrations due to their major role to the dangerous pollution that engulfs the metropolis as colder weather approaches.
Nevertheless earlier this year, the newly elected local leadership petitioned the supreme court to seek a relaxation of the prohibition.
They proposed allowing "environmentally conscious pyrotechnics" – which have been doubted by environmentalists as being only approximately one-third lower impact – as a balance between "heritage and ecological concerns".
Despite concerns of medical and ecological campaigners, the court complied with the proposal, specifying that environmentally conscious fireworks could be set off during limited time windows throughout the celebrations.
On Monday night, there was considerable disregard of the designated hours across the metropolis, with minimal enforcement regarding whether the firecrackers being used were actually the supposedly greener type.
Many monitoring devices throughout the city recorded pollution spiking around the night hours to extremely hazardous measurements observed during celebrations in at least three years.
The proliferation of pyrotechnics during the festival also triggered a blame game with adjacent the neighboring country, with officials in Pakistan's Punjab partly blaming declining air quality in Lahore on contaminants originating in across the border following the events.
Alarmingly severe levels of air contamination in Delhi have continued as a major problem for over a decade and a half, with the condition continuing to worsen.
Around celebratory seasons, the amount of dangerous particulate matter in the atmosphere has been found to spike to seventy percent above the worst records ever recorded in the Chinese city, which was previously considered as the planet's dirtiest metropolis.
The problem in the city is caused by a mix of multiple factors including heavy vehicle emissions, construction debris, construction activities, waste incineration and haze from crop residue ignition in nearby areas of Punjab and Haryana.
In these regions, rural residents routinely ignite agricultural waste to expedite field preparation, producing dangerous smog that becomes contained over the city as colder air descends.
Public health and economic consequences on the roughly thirty-three million inhabitants residing in the metropolitan zone is enormous, according to multiple research.
The contaminated air results in elevated rates of neurological, cardiovascular and respiratory diseases, and can result in oncological diseases.
The pollution is projected to be responsible for ten thousand premature fatalities annually in the city.
Lena is an environmental scientist and writer passionate about promoting sustainable practices through accessible, evidence-based content.