On Tuesday morning inhabitants of this heavily contaminated metropolis were faced with breathing dangerously toxic air that was classified as the "severe" range.
Several parts of the city recorded an AQI above 500, which translates to a tenfold increase over the healthy limit established by the World Health Organization.
Certain monitoring stations, levels of toxic particulate matter hit highs of 1,800, amounting to fifteen to twenty times higher than safe standards.
For the past four years, authorities had maintained a comprehensive restriction on the sale and use of fireworks during the Festival of Lights due to their major role to the deadly pollution that engulfs the metropolis as winter approaches.
Nevertheless recently, the current regional leadership approached the highest court to propose a modification of the prohibition.
The suggestion was allowing "environmentally conscious pyrotechnics" – previously questioned by environmentalists as being only approximately one-third lower impact – as a balance between "heritage and ecological concerns".
Despite concerns of medical and ecological activists, judges complied with the request, stipulating that eco-friendly pyrotechnics could be used during specific periods throughout the festival.
Throughout the festival evening, there was considerable violation of the designated hours across the city, with little enforcement regarding whether the fireworks being used were actually the more environmentally friendly version.
Several recording stations throughout the city recorded pollution spiking around midnight to some of the worst readings recorded during the festival in at least the past three years.
The widespread use of firecrackers during the festival also triggered a blame game with neighbouring Pakistan, with officials in Pakistani the Punjab region partially attributing declining pollution levels in their urban centers on pollutants traveling from India following the events.
The dangerously high concentrations of pollution in the city have continued as a major issue for over a decade and a half, with the condition showing no improvement.
Around celebratory seasons, the amount of dangerous airborne contaminants in the environment has been observed to shoot up to 70% higher the peak levels ever recorded in the Chinese city, which was once regarded as the planet's dirtiest city.
The situation in Delhi is resulting from a convergence of different contributors including transportation pollution, construction debris, development work, waste incineration and haze from agricultural fires in neighbouring regions of neighboring agricultural zones.
In these regions, rural residents illegally burn crop residue to clear them quickly, generating dangerous pollution that then gets trapped over the city as colder air arrives.
Both financial and medical impact on the roughly thirty-three million inhabitants living in the capital region is enormous, according to numerous research.
These hazardous conditions results in increased incidence of nervous system, heart and circulatory and lung conditions, and can even lead to oncological diseases.
Environmental contamination is estimated to be causing approximately 10k untimely mortalities annually in Delhi.
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