Tuesday brought inhabitants of the planet's dirtiest urban center found themselves inhaling dangerously toxic air that was classified as the "severe" range.
Multiple areas of the capital recorded an pollution measurement exceeding 500, which represents ten times the recommended threshold set by the global health authority.
Certain monitoring stations, levels of PM2.5 and PM10 reached peaks of 1800, representing fifteen to twenty times above healthy levels.
For the past four years, the government had enforced a comprehensive restriction on the distribution and bursting of fireworks during Diwali due to their major role to the deadly smog that blankets the city as the cold season sets in.
However in recent months, the recently formed regional leadership appealed to the supreme court to propose a easing of the prohibition.
The suggestion was allowing "green crackers" – which have been criticized by environmental experts as being only approximately one-third reduced emissions – as a middle ground between "tradition and environment".
To the disappointment of public health and environmental activists, judicial authorities agreed to the proposal, specifying that eco-friendly pyrotechnics could be ignited during designated periods throughout the festival.
During the celebrations, there was considerable flouting of the designated hours across the capital, with little regulation regarding whether the fireworks being used were actually the eco-friendly variety.
Many air quality sensors throughout Delhi registered air quality spiking around the night hours to extremely hazardous measurements observed during celebrations in at least the past three years.
Extensive ignition of firecrackers during Diwali also initiated a controversy with adjacent the neighboring country, with authorities in Pakistani the Punjab region partly blaming declining atmospheric conditions in the city of Lahore on hazardous particles originating in India following the events.
Alarmingly severe levels of atmospheric toxins in the capital have continued as a serious problem for more than 15 years, with the situation continuing to worsen.
Around Diwali, the concentration of dangerous airborne contaminants in the environment has been observed to spike to 70% higher the peak records ever recorded in China's capital, which was previously considered as the planet's dirtiest metropolis.
This crisis in the capital is attributed to a mix of various sources including heavy vehicle emissions, airborne particles, development work, waste incineration and smoke from crop residue ignition in neighbouring regions of farming communities.
In these regions, rural residents illegally ignite agricultural waste to prepare for next season, generating dangerous pollution that remains stagnant over the city as colder air sets in.
The economic and health impact on the approximately 33 million inhabitants residing in the Delhi area is significant, according to various research.
The contaminated air causes elevated rates of nervous system, heart and circulatory and respiratory disorders, and can result in cancer.
Environmental contamination is estimated to be causing 10,000 premature fatalities per year in the capital.
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