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As Tuesday dawned residents of this heavily contaminated metropolis encountered breathing severely hazardous air that was classified as the "severe" level.

Record-Breaking Air Quality Measurements

Various sections of the capital registered an air quality index above 500, which equals a tenfold increase over the safe limit established by the global health authority.

In some locations, readings of toxic particulate matter soared to of eighteen hundred, representing 15 to 20 times higher than safe levels.

Firecracker Ban and New Developments

For the past four years, the government had maintained a total prohibition on the sale and use of fireworks during Diwali due to their major role to the dangerous haze that engulfs the city as the cold season sets in.

Nevertheless in recent months, the recently formed regional leadership approached the highest court to propose a easing of the prohibition.

They proposed allowing "green crackers" – previously questioned by environmentalists as being only approximately one-third lower impact – as a balance between "heritage and ecological concerns".

Legal Verdict and Implementation

Much to the frustration of public health and environmental campaigners, judges approved the request, stipulating that environmentally conscious fireworks could be used during designated hours throughout the Diwali.

Throughout the festival evening, there was extensive violation of the regulated periods across the city, with little enforcement regarding whether the firecrackers being used were actually the more environmentally friendly version.

Several monitoring devices throughout the capital showed pollution spiking around late evening to extremely hazardous readings observed during Diwali in at least three years.

Regional Implications

The proliferation of firecrackers during the festival also triggered a controversy with neighbouring Pakistan, with representatives in Pakistani Punjab province partly blaming declining air quality in their urban centers on pollutants coming from across the border following the festivities.

Persistent Environmental Issue

The dangerously high readings of atmospheric toxins in the city have persisted as a major problem for fifteen-plus years, with the situation showing no improvement.

Around celebratory seasons, the levels of toxic particulate matter in the atmosphere has been found to spike to 70% higher the worst levels ever documented in Beijing, which was previously viewed as the globally most contaminated metropolis.

Various Pollution Factors

The problem in Delhi is resulting from a combination of various sources including heavy vehicle emissions, airborne particles, building projects, waste incineration and smoke from agricultural fires in neighbouring areas of farming communities.

Within these states, farmers regularly ignite agricultural waste to clear them quickly, generating toxic haze that remains stagnant over the city as cooler air sets in.

Medical and Financial Impact

Both financial and medical consequences on the nearly 33 million residents calling home the Delhi area is enormous, according to various studies.

This pollution causes high levels of neurological, heart and circulatory and lung disorders, and can result in malignancies.

The pollution is calculated to be responsible for 10,000 premature deaths annually in the city.