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As Tuesday dawned inhabitants of the world's most polluted city were faced with inhaling severely hazardous air that fell into the "critical" level.

Record-Breaking Pollution Levels

Multiple areas of the city recorded an air quality index exceeding 500, which represents ten times the safe limit established by the WHO.

In some locations, concentrations of toxic particulate matter hit highs of 1800, equating to 15 to 20 times exceeding healthy limits.

Firecracker Restrictions and Recent Developments

For the past four years, officials had implemented a complete ban on the purchase and ignition of firecrackers during Diwali due to their significant contribution to the deadly smog that blankets the capital as winter approaches.

Yet earlier this year, the newly elected city administration appealed to the highest court to propose a easing of the prohibition.

Officials advocated for allowing "environmentally conscious pyrotechnics" – previously doubted by conservation groups as being only roughly 30 percent reduced emissions – as a middle ground between "cultural practices and ecological concerns".

Legal Verdict and Reality

To the disappointment of medical and ecological activists, judicial authorities agreed to the proposal, stipulating that green firecrackers could be used during limited hours throughout the Diwali.

During the celebrations, there was widespread disregard of the designated hours across the capital, with minimal regulation regarding whether the firecrackers being used were actually the more environmentally friendly type.

Many monitoring devices throughout the city recorded pollution spiking around midnight to the most severe levels seen during Diwali in at least three years.

International Implications

Extensive ignition of pyrotechnics during the festival also triggered a controversy with bordering the neighboring country, with representatives in Pakistan's the Punjab region pointing to deteriorating pollution levels in the city of Lahore on pollutants coming from India following the events.

Persistent Environmental Problem

The dangerously high concentrations of pollution in the city have persisted as a significant challenge for more than 15 years, with the situation gradually deteriorating.

During the festival period, the concentration of dangerous particulate matter in the atmosphere has been observed to increase dramatically to significantly exceeding the most severe levels ever documented in the Chinese city, which was formerly viewed as the world's most polluted city.

Various Contamination Contributors

The situation in the capital is caused by a mix of different contributors including heavy vehicle emissions, airborne particles, building projects, waste incineration and pollutants from crop residue ignition in adjacent areas of farming communities.

In these regions, agricultural workers regularly ignite agricultural waste to expedite field preparation, creating dangerous smog that remains stagnant over the capital as cooler air arrives.

Health and Economic Toll

Both financial and medical consequences on the roughly thirty-three million residents calling home the Delhi area is significant, according to various investigations.

These hazardous conditions causes increased incidence of nervous system, heart and circulatory and breathing conditions, and can potentially cause oncological diseases.

Environmental contamination is calculated to be responsible for approximately 10k premature mortalities annually in the city.