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On Tuesday morning residents of this heavily contaminated metropolis encountered exposed to extremely polluted air that was classified as the "alarming" level.

Alarming Air Quality Measurements

Several parts of Delhi recorded an pollution measurement above 500, which equals a tenfold increase over the healthy level established by the World Health Organization.

In some locations, readings of dangerous airborne particles hit highs of 1,800, representing 15 to 20 times higher than healthy levels.

Fireworks Restrictions and New Changes

For the past four years, authorities had maintained a total prohibition on the sale and use of firecrackers during celebrations due to their substantial impact to the hazardous smog that engulfs the capital as colder weather approaches.

However in recent months, the current regional administration approached the judicial authority to seek a modification of the ban.

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 "heritage and public health".

Court Decision and Enforcement

Despite concerns of public health and environmental advocates, judicial authorities approved the appeal, stipulating that green firecrackers could be ignited during limited periods throughout the festival.

Throughout the festival evening, there was extensive disregard of the time restrictions across the metropolis, with minimal monitoring regarding whether the firecrackers being used were actually the more environmentally friendly type.

Several recording stations throughout Delhi registered contamination reaching highest levels around the night hours to some of the worst readings seen during the festival in at least the past three years.

Cross-Border Effects

Extensive ignition of fireworks during the celebrations also sparked a controversy with neighbouring the neighboring country, with authorities in Pakistan's the Punjab region partially attributing worsening air quality in Lahore on contaminants traveling from across the border following the celebrations.

Long-Standing Environmental Problem

Extremely elevated levels of pollution in the city have continued as a serious problem for over a decade and a half, with the situation continuing to worsen.

Around the festival period, the amount of toxic airborne contaminants in the environment has been found to shoot up to significantly exceeding the most severe levels ever recorded in Beijing, which was previously considered as the world's most polluted metropolis.

Diverse Contamination Sources

The situation in the capital is resulting from a convergence of multiple factors including heavy vehicle emissions, airborne particles, building projects, waste incineration and pollutants from farm burning in adjacent states of Punjab and Haryana.

In these regions, agricultural workers routinely burn crop residue to prepare for next season, creating dangerous haze that remains stagnant over the capital as colder air sets in.

Public Health and Financial Consequences

Public health and economic impact on the roughly thirty-three million inhabitants residing in the capital region is substantial, according to numerous studies.

The contaminated air leads to elevated rates of neurological, cardiovascular and breathing disorders, and can result in cancer.

Air quality crisis is projected to be causing approximately 10k untimely fatalities annually in the capital.