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Tuesday brought inhabitants of this heavily contaminated metropolis were faced with breathing severely hazardous air that registered in the "critical" range.

Alarming Pollution Measurements

Various sections of Delhi recorded an air quality index over 500, which represents ten times the healthy limit recommended by the World Health Organization.

Certain monitoring stations, concentrations of PM2.5 and PM10 reached peaks of 1,800, equating to 15 to 20 times above acceptable standards.

Pyrotechnics Ban and Recent Changes

Since 2020, officials had maintained a comprehensive restriction on the sale and use of firecrackers during celebrations due to their major role to the hazardous haze that blankets the metropolis as colder weather begins.

However in recent months, the recently formed city government approached the judicial authority to request a relaxation of the restrictions.

They proposed allowing "eco-friendly fireworks" – historically criticized by conservation groups as being only about 30% reduced emissions – as a middle ground between "cultural practices and ecological concerns".

Judicial Ruling and Enforcement

To the disappointment of public health and environmental advocates, judges agreed to the proposal, specifying that environmentally conscious fireworks could be used during limited periods throughout the Diwali.

During the celebrations, there was considerable flouting of the time restrictions across the capital, with insufficient enforcement regarding whether the firecrackers being used were actually the supposedly greener version.

Several air quality sensors throughout Delhi recorded pollution reaching highest levels around midnight to some of the worst levels seen during Diwali in at least three years.

Cross-Border Effects

The widespread use of firecrackers during the festival also initiated a dispute with adjacent the neighboring country, with officials in Pakistan's Punjab province partly blaming deteriorating pollution levels in Lahore on pollutants coming from across the border following the events.

Persistent Pollution Problem

Extremely elevated levels of pollution in the city have persisted as a major challenge for more than 15 years, with the condition continuing to worsen.

During Diwali, the amount of dangerous particles in the air has been found to increase dramatically to significantly exceeding the most severe readings ever measured in Beijing, which was once viewed as the globally most contaminated urban center.

Multiple Contamination Factors

This crisis in Delhi is caused by a convergence of multiple factors including heavy vehicle emissions, airborne particles, development work, waste incineration and pollutants from farm burning in neighbouring areas of Punjab and Haryana.

Throughout these areas, agricultural workers illegally ignite agricultural waste to expedite field preparation, producing toxic haze that becomes contained over the city as cooler air descends.

Public Health and Financial Impact

Both financial and medical impact on the nearly 33 million residents calling home the capital region is significant, according to multiple investigations.

The contaminated air causes increased incidence of nervous system, heart and circulatory and respiratory diseases, and can result in malignancies.

The pollution is estimated to be responsible for approximately 10k untimely deaths annually in Delhi.