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As Tuesday dawned citizens of the planet's dirtiest urban center encountered breathing dangerously toxic air that registered in the "severe" level.

Alarming Air Quality Readings

Various sections of the city recorded an AQI above 500, which represents ten times the recommended level established by the World Health Organization.

In some locations, readings of toxic particulate matter soared to of 1800, amounting to 15-20x exceeding safe standards.

Fireworks Prohibition and Recent Changes

For the past four years, officials had maintained a total prohibition on the purchase and ignition of pyrotechnics during Diwali due to their substantial impact to the hazardous smog that covers the city as the cold season sets in.

Yet in recent months, the recently formed regional leadership petitioned the judicial authority to seek a easing of the ban.

They proposed allowing "green crackers" – historically questioned by conservation groups as being only about 30% lower impact – as a balance between "tradition and public health".

Judicial Decision and Enforcement

Despite concerns of public health and environmental activists, judicial authorities approved the request, specifying that eco-friendly pyrotechnics could be set off during specific time windows throughout the Diwali.

Throughout the festival evening, there was widespread violation of the regulated periods across the capital, with insufficient regulation regarding whether the fireworks being used were actually the more environmentally friendly type.

Several air quality sensors throughout the city recorded contamination spiking around late evening to some of the worst levels seen during Diwali in at least recent memory.

Regional Effects

Extensive ignition of firecrackers during the festival also triggered a blame game with bordering the neighboring country, with officials in Pakistan's Punjab partly blaming declining pollution levels in their urban centers on pollutants coming from neighboring India following the celebrations.

Chronic Pollution Crisis

Alarmingly severe levels of air contamination in Delhi have remained as a significant issue for fifteen-plus years, with the problem showing no improvement.

Near Diwali, the amount of toxic particles in the atmosphere has been documented to increase dramatically to significantly exceeding the worst records ever measured in the Chinese city, which was once considered as the planet's dirtiest city.

Multiple Contamination Factors

The situation in the capital is caused by a mix of different contributors including automobile exhaust, airborne particles, construction activities, rubbish burning and pollutants from farm burning in neighbouring areas of Punjab and Haryana.

Throughout these areas, agricultural workers routinely ignite agricultural waste to clear them quickly, producing hazardous smog that becomes contained over the city as cooler air arrives.

Health and Financial Toll

The economic and health consequences on the roughly thirty-three million people living in the metropolitan zone is substantial, according to various investigations.

This pollution causes increased incidence of neurological, heart and circulatory and breathing conditions, and can result in malignancies.

Environmental contamination is estimated to be accounting for ten thousand premature fatalities annually in the city.