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Tuesday brought citizens of the world's most polluted city were faced with inhaling severely hazardous air that was classified as the "critical" level.

Alarming Air Quality Measurements

Several parts of Delhi registered an AQI exceeding 500, which represents a tenfold increase over the healthy threshold set by the global health authority.

Particular areas, concentrations of dangerous airborne particles reached peaks of 1,800, representing 15-20x above acceptable limits.

Pyrotechnics Prohibition and Recent Policy Shifts

For the past four years, officials had maintained a complete ban on the purchase and ignition of firecrackers during Diwali due to their substantial impact to the dangerous haze that engulfs the city as the cold season begins.

However earlier this year, the newly elected city government petitioned the supreme court to propose a easing of the prohibition.

The suggestion was allowing "eco-friendly fireworks" – historically doubted by environmental experts as being only about 30% lower impact – as a compromise between "heritage and ecological concerns".

Judicial Ruling and Reality

Despite concerns of public health and environmental advocates, the court complied with the proposal, mandating that green firecrackers could be set off during specific time windows throughout the Diwali.

Throughout the festival evening, there was considerable disregard of the time restrictions across the capital, with insufficient monitoring regarding whether the fireworks being used were actually the eco-friendly version.

Many recording stations throughout the city recorded contamination reaching highest levels around late evening to the most severe measurements observed during the festival in at least the past three years.

Cross-Border Implications

The widespread use of firecrackers during the festival also initiated a dispute with neighbouring Pakistan, with officials in Pakistani Punjab province partly blaming worsening pollution levels in their urban centers on hazardous particles traveling from across the border following the celebrations.

Long-Standing Pollution Problem

Extremely elevated levels of pollution in the city have continued as a major issue for more than 15 years, with the problem showing no improvement.

Around celebratory seasons, the levels of dangerous particles in the atmosphere has been observed to increase dramatically to significantly exceeding the most severe levels ever documented in China's capital, which was formerly viewed as the world's most polluted city.

Diverse Pollution Contributors

The problem in the city is attributed to a mix of various sources including automobile exhaust, construction debris, construction activities, garbage fires and pollutants from crop residue ignition in neighbouring states of neighboring agricultural zones.

Within these states, farmers routinely burn crop residue to expedite field preparation, creating dangerous smog that then gets trapped over the capital as cooler air descends.

Health and Economic Impact

Public health and economic consequences on the roughly thirty-three million residents residing in the capital region is enormous, according to multiple research.

These hazardous conditions results in elevated rates of neurological, cardiovascular and lung diseases, and can result in oncological diseases.

Air quality crisis is calculated to be causing ten thousand early mortalities per year in the city.