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Tuesday brought citizens of this heavily contaminated metropolis found themselves breathing severely hazardous air that registered in the "critical" category.

Record-Breaking Pollution Levels

Multiple areas of the city recorded an air quality index above 500, which equals ten times the recommended limit set by the global health authority.

Particular areas, levels of PM2.5 and PM10 reached peaks of 1,800, amounting to 15 to 20 times exceeding safe levels.

Fireworks Restrictions and Recent Policy Shifts

Since 2020, the government had maintained a total prohibition on the purchase and ignition of fireworks during Diwali due to their substantial impact to the deadly smog that engulfs the capital as colder weather sets in.

Nevertheless earlier this year, the recently formed city leadership petitioned the judicial authority to propose a modification of the prohibition.

They proposed allowing "green crackers" – which have been questioned by conservation groups as being only about 30% reduced emissions – as a compromise between "heritage and environment".

Legal Ruling and Reality

Much to the frustration of environmental and health campaigners, judicial authorities agreed to the request, stipulating that environmentally conscious fireworks could be set off during designated time windows throughout the Diwali.

During the celebrations, there was considerable violation of the regulated periods across the city, with insufficient monitoring regarding whether the fireworks being used were actually the supposedly greener version.

Many monitoring devices throughout the capital registered pollution reaching highest levels around midnight to extremely hazardous readings recorded during the festival in at least three years.

Regional Effects

Extensive ignition of pyrotechnics during the celebrations also triggered a controversy with neighbouring Pakistan, with officials in Pakistan's the Punjab region pointing to deteriorating air quality in the city of Lahore on contaminants coming from India following the celebrations.

Long-Standing Pollution Problem

Alarmingly severe concentrations of pollution in the capital have remained as a serious problem for more than 15 years, with the situation showing no improvement.

Around Diwali, the amount of toxic airborne contaminants in the atmosphere has been documented to increase dramatically to seventy percent above the most severe levels ever documented in Beijing, which was formerly regarded as the planet's dirtiest city.

Various Pollution Contributors

The situation in the city is attributed to a mix of various sources including automobile exhaust, dust, development work, garbage fires and haze from farm burning in adjacent regions of farming communities.

In these regions, agricultural workers routinely set their fields on fire to expedite field preparation, creating toxic pollution that becomes contained over the metropolitan area as winter air arrives.

Health and Financial Impact

Public health and economic consequences on the roughly thirty-three million people living in the capital region is substantial, according to various research.

The contaminated air causes increased incidence of neurological, cardiovascular and respiratory conditions, and can even lead to oncological diseases.

The pollution is calculated to be accounting for 10,000 early mortalities annually in Delhi.