Tuesday brought citizens of the planet's dirtiest urban center found themselves exposed to dangerously toxic air that was classified as the "alarming" level.
Multiple areas of the city recorded an AQI exceeding 500, which equals a tenfold increase over the healthy threshold recommended by the World Health Organization.
Certain monitoring stations, concentrations of toxic particulate matter reached peaks of eighteen hundred, amounting to 15-20x exceeding acceptable levels.
For the past four years, the government had maintained a total prohibition on the sale and use of firecrackers during the Festival of Lights due to their major role to the dangerous haze that blankets the city as winter sets in.
However earlier this year, the current regional government approached the highest court to request a modification of the ban.
The suggestion was allowing "environmentally conscious pyrotechnics" – previously criticized by environmentalists as being only roughly 30 percent reduced emissions – as a balance between "tradition and public health".
Despite concerns of medical and ecological advocates, judges approved the proposal, stipulating that green firecrackers could be ignited during specific periods throughout the celebrations.
Throughout the festival evening, there was widespread violation of the designated hours across the capital, with minimal monitoring regarding whether the fireworks being used were actually the supposedly greener variety.
Many monitoring devices throughout Delhi registered contamination reaching highest levels around late evening to extremely hazardous readings seen during Diwali in at least recent memory.
Extensive ignition of firecrackers during the festival also sparked a controversy with bordering the neighboring country, with representatives in Pakistani Punjab province partly blaming deteriorating air quality in their urban centers on pollutants traveling from across the border following the festivities.
Alarmingly severe levels of atmospheric toxins in the capital have continued as a serious challenge for more than 15 years, with the condition showing no improvement.
During the festival period, the concentration of toxic airborne contaminants in the air has been documented to spike to seventy percent above the most severe levels ever measured in the Chinese city, which was once regarded as the world's most polluted metropolis.
The situation in Delhi is caused by a combination of various sources including transportation pollution, construction debris, development work, rubbish burning and smoke from farm burning in neighbouring states of neighboring agricultural zones.
In these regions, agricultural workers routinely burn crop residue to clear them quickly, creating toxic smog that then gets trapped over the metropolitan area as winter air arrives.
Public health and economic consequences on the nearly 33 million residents residing in the Delhi area is significant, according to various studies.
The contaminated air causes elevated rates of nervous system, heart and circulatory and respiratory diseases, and can potentially cause oncological diseases.
The pollution is estimated to be accounting for ten thousand early fatalities annually in the capital.
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