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Tuesday brought citizens of this heavily contaminated metropolis were faced with exposed to severely hazardous air that fell into the "critical" range.

Extremely High Pollution Levels

Various sections of the city recorded an AQI exceeding 500, which equals a tenfold increase over the recommended level recommended by the WHO.

Certain monitoring stations, readings of dangerous airborne particles soared to of 1,800, amounting to 15-20x above acceptable standards.

Firecracker Ban and Recent Policy Shifts

Beginning in 2020, the government had implemented a complete ban on the purchase and ignition of firecrackers during celebrations due to their major role to the deadly pollution that covers the capital as winter sets in.

However in recent months, the current regional administration approached the supreme court to seek a modification of the prohibition.

Officials advocated for allowing "environmentally conscious pyrotechnics" – which have been doubted by environmentalists as being only about 30% lower impact – as a compromise between "heritage and public health".

Court Decision and Reality

Much to the frustration of public health and environmental advocates, judges complied with the proposal, mandating that eco-friendly pyrotechnics could be set off during specific periods throughout the festival.

During the celebrations, there was extensive violation of the time restrictions across the metropolis, with insufficient regulation regarding whether the pyrotechnics being used were actually the more environmentally friendly version.

Many monitoring devices throughout Delhi registered contamination spiking around late evening to some of the worst levels recorded during Diwali in at least the past three years.

Cross-Border Implications

The widespread use of fireworks during the celebrations also triggered a dispute with adjacent Pakistan, with representatives in Pakistan's Punjab pointing to declining air quality in the city of Lahore on hazardous particles traveling from neighboring India following the celebrations.

Long-Standing Environmental Problem

The dangerously high levels of atmospheric toxins in Delhi have remained as a major problem for fifteen-plus years, with the condition gradually deteriorating.

Around the festival period, the concentration of dangerous airborne contaminants in the atmosphere has been observed to shoot up to 70% higher the peak readings ever documented in the Chinese city, which was once viewed as the globally most contaminated city.

Multiple Contamination Sources

This crisis in the capital is resulting from a combination of multiple factors including automobile exhaust, airborne particles, development work, garbage fires and pollutants from farm burning in neighbouring areas of farming communities.

In these regions, rural residents regularly burn crop residue to prepare for next season, creating hazardous pollution that then gets trapped over the metropolitan area as colder air descends.

Medical and Financial Consequences

Public health and economic consequences on the approximately 33 million people living in the metropolitan zone is enormous, according to multiple investigations.

The contaminated air causes elevated rates of nervous system, cardiovascular and lung conditions, and can potentially cause malignancies.

The pollution is projected to be causing approximately 10k premature deaths per year in the city.