On Tuesday morning residents of this heavily contaminated metropolis encountered exposed to extremely polluted air that fell into the "severe" category.
Various sections of the capital showed an pollution measurement exceeding 500, which represents 10x the healthy threshold recommended by the World Health Organization.
In some locations, concentrations of PM2.5 and PM10 hit highs of 1800, equating to fifteen to twenty times higher than safe limits.
Beginning in 2020, authorities had implemented a total prohibition on the purchase and ignition of pyrotechnics during the Festival of Lights due to their significant contribution to the dangerous smog that covers the metropolis as the cold season approaches.
Nevertheless earlier this year, the newly elected regional administration petitioned the judicial authority to seek a relaxation of the restrictions.
Officials advocated for allowing "environmentally conscious pyrotechnics" – previously doubted by environmentalists as being only about 30% reduced emissions – as a compromise between "heritage and public health".
To the disappointment of public health and environmental advocates, the court agreed to the request, mandating that green firecrackers could be used during specific hours throughout the Diwali.
Throughout the festival evening, there was extensive violation of the designated hours across the capital, with insufficient regulation regarding whether the fireworks being used were actually the supposedly greener type.
Numerous recording stations throughout the capital showed pollution peaking around late evening to some of the worst measurements seen during Diwali in at least the past three years.
The proliferation of pyrotechnics during Diwali also sparked a dispute with neighbouring Pakistan, with officials in Pakistan's Punjab province partially attributing worsening pollution levels in Lahore on pollutants traveling from India following the events.
The dangerously high readings of air contamination in Delhi have remained as a significant challenge for over a decade and a half, with the situation gradually deteriorating.
Near Diwali, the amount of dangerous particles in the environment has been documented to spike to 70% higher the peak levels ever documented in the Chinese city, which was once considered as the planet's dirtiest metropolis.
The problem in the capital is resulting from a mix of different contributors including heavy vehicle emissions, dust, construction activities, rubbish burning and haze from crop residue ignition in neighbouring states of Punjab and Haryana.
Within these states, rural residents regularly ignite agricultural waste to clear them quickly, generating dangerous haze that becomes contained over the capital as colder air descends.
Both financial and medical consequences on the roughly thirty-three million people calling home the Delhi area is substantial, according to multiple studies.
These hazardous conditions leads to increased incidence of nervous system, heart and circulatory and respiratory diseases, and can potentially cause malignancies.
Air quality crisis is calculated to be causing approximately 10k untimely deaths per year in the city.
Smartwatch enthusiast and tech writer based in Enschede, covering wearable innovations.