Tuesday brought residents of the planet's dirtiest urban center found themselves inhaling extremely polluted air that fell into the "alarming" level.
Various sections of the city registered an pollution measurement above 500, which equals 10x the recommended level established by the global health authority.
In some locations, readings of dangerous airborne particles reached peaks of eighteen hundred, representing 15 to 20 times higher than healthy standards.
For the past four years, officials had maintained a complete ban on the distribution and bursting of firecrackers during the Festival of Lights due to their major role to the deadly haze that engulfs the metropolis as colder weather approaches.
Nevertheless recently, the recently formed local administration appealed to the judicial authority to seek a relaxation of the restrictions.
The suggestion was allowing "green crackers" – which have been doubted by environmentalists as being only approximately one-third less polluting – as a middle ground between "tradition and public health".
Much to the frustration of medical and ecological advocates, the court agreed to the appeal, mandating that eco-friendly pyrotechnics could be ignited during designated time windows throughout the festival.
Throughout the festival evening, there was extensive flouting of the designated hours across the capital, with little monitoring regarding whether the fireworks being used were actually the supposedly greener type.
Numerous monitoring devices throughout Delhi registered air quality peaking around midnight to some of the worst readings recorded during the festival in at least recent memory.
The widespread use of fireworks during the festival also triggered a dispute with neighbouring Pakistan, with representatives in Pakistani Punjab province pointing to declining atmospheric conditions in the city of Lahore on pollutants coming from across the border following the celebrations.
Alarmingly severe levels of atmospheric toxins in Delhi have continued as a serious issue for over a decade and a half, with the situation continuing to worsen.
Near Diwali, the concentration of hazardous airborne contaminants in the air has been observed to spike to significantly exceeding the worst levels ever documented in Beijing, which was formerly considered as the planet's dirtiest metropolis.
The problem in the capital is resulting from a mix of different contributors including automobile exhaust, airborne particles, development work, garbage fires and pollutants from crop residue ignition in nearby regions of Punjab and Haryana.
Throughout these areas, rural residents routinely burn crop residue to expedite field preparation, creating dangerous pollution that becomes contained over the city as colder air descends.
The economic and health impact on the approximately 33 million residents residing in the metropolitan zone is substantial, according to multiple investigations.
These hazardous conditions causes high levels of neurological, cardiovascular and breathing diseases, and can potentially cause malignancies.
The pollution is projected to be accounting for ten thousand premature mortalities each year in Delhi.
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