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Tuesday brought residents of this heavily contaminated metropolis were faced with exposed to severely hazardous air that registered in the "critical" category.

Extremely High Air Quality Measurements

Several parts of the city registered an AQI exceeding 500, which represents ten times the recommended level established by the WHO.

Particular areas, levels of toxic particulate matter hit highs of eighteen hundred, equating to 15 to 20 times above acceptable levels.

Pyrotechnics Prohibition and New Developments

For the past four years, the government had implemented a complete ban on the sale and use of fireworks during the Festival of Lights due to their significant contribution to the deadly pollution that covers the city as colder weather sets in.

Nevertheless recently, the newly elected city government petitioned the highest court to propose a modification of the restrictions.

Officials advocated for allowing "green crackers" – historically doubted by environmental experts as being only about 30% less polluting – as a compromise between "heritage and environment".

Judicial Decision and Reality

Despite concerns of public health and environmental campaigners, judges approved the request, mandating that eco-friendly pyrotechnics could be ignited during designated time windows throughout the Diwali.

During the celebrations, there was considerable violation of the time restrictions across the city, with insufficient enforcement regarding whether the pyrotechnics being used were actually the more environmentally friendly variety.

Many recording stations throughout the capital registered pollution spiking around midnight to the most severe levels observed during the festival in at least recent memory.

Regional Effects

Extensive ignition of firecrackers during the celebrations also initiated a controversy with neighbouring the neighboring country, with officials in Pakistan's the Punjab region pointing to deteriorating air quality in their urban centers on contaminants coming from across the border following the celebrations.

Persistent Pollution Problem

The dangerously high concentrations of air contamination in the capital have persisted as a significant challenge for more than 15 years, with the situation showing no improvement.

Around celebratory seasons, the levels of toxic particles in the atmosphere has been documented to spike to 70% higher the most severe records ever recorded in the Chinese city, which was previously considered as the globally most contaminated city.

Diverse Pollution Sources

The problem in Delhi is caused by a convergence of various sources including heavy vehicle emissions, construction debris, construction activities, garbage fires and smoke from crop residue ignition in adjacent regions of neighboring agricultural zones.

Throughout these areas, rural residents illegally set their fields on fire to expedite field preparation, producing hazardous smog that becomes contained over the capital as cooler air sets in.

Medical and Financial Toll

Public health and economic consequences on the roughly thirty-three million residents living in the metropolitan zone is enormous, according to multiple investigations.

These hazardous conditions causes increased incidence of neurological, heart and circulatory and respiratory conditions, and can even lead to malignancies.

The pollution is estimated to be accounting for approximately 10k untimely mortalities each year in Delhi.