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As Tuesday dawned residents of the planet's dirtiest urban center encountered exposed to dangerously toxic air that fell into the "alarming" level.

Alarming Air Quality Readings

Various sections of the city recorded an AQI above 500, which translates to 10x the safe threshold set by the World Health Organization.

In some locations, readings of dangerous airborne particles hit highs of 1,800, amounting to 15 to 20 times higher than healthy standards.

Fireworks Ban and Recent Changes

For the past four years, the government had implemented a comprehensive restriction on the sale and use of pyrotechnics during Diwali due to their substantial impact to the dangerous smog that covers the city as the cold season begins.

Nevertheless earlier this year, the recently formed local government appealed to the judicial authority to seek a modification of the prohibition.

The suggestion was allowing "eco-friendly fireworks" – previously doubted by conservation groups as being only about 30% reduced emissions – as a compromise between "tradition and public health".

Legal Verdict and Implementation

To the disappointment of environmental and health campaigners, the court agreed to the appeal, specifying that environmentally conscious fireworks could be used during designated periods throughout the Diwali.

Throughout the festival evening, there was widespread flouting of the time restrictions across the city, with little monitoring regarding whether the pyrotechnics being used were actually the supposedly greener variety.

Numerous air quality sensors throughout the capital registered contamination spiking around late evening to extremely hazardous measurements observed during the festival in at least three years.

International Implications

Extensive ignition of fireworks during the festival also sparked a blame game with neighbouring the neighboring country, with authorities in Pakistani the Punjab region partly blaming worsening pollution levels in their urban centers on pollutants originating in neighboring India following the events.

Chronic Pollution Crisis

Extremely elevated readings of air contamination in Delhi have continued as a significant issue for fifteen-plus years, with the situation gradually deteriorating.

Around celebratory seasons, the amount of dangerous particles in the air has been found to spike to significantly exceeding the most severe levels ever measured in China's capital, which was formerly considered as the planet's dirtiest metropolis.

Various Contamination Sources

The problem in the capital is caused by a convergence of different contributors including automobile exhaust, airborne particles, building projects, garbage fires and smoke from farm burning in nearby regions of farming communities.

Within these states, agricultural workers routinely set their fields on fire to expedite field preparation, creating toxic haze that becomes contained over the metropolitan area as cooler air descends.

Medical and Financial Toll

Public health and economic consequences on the approximately 33 million people living in the metropolitan zone is enormous, according to various investigations.

These hazardous conditions results in elevated rates of neurological, cardiovascular and respiratory diseases, and can even lead to malignancies.

Air quality crisis is estimated to be causing approximately 10k premature fatalities annually in Delhi.