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Tuesday brought citizens of the planet's dirtiest urban center encountered breathing dangerously toxic air that fell into the "severe" level.

Record-Breaking Pollution Measurements

Various sections of the city showed an air quality index above 500, which represents 10x the safe threshold established by the global health authority.

Particular areas, concentrations of toxic particulate matter reached peaks of 1800, amounting to 15 to 20 times higher than acceptable standards.

Firecracker Ban and New Changes

For the past four years, officials had implemented a total prohibition on the distribution and bursting of firecrackers during the Festival of Lights due to their significant contribution to the deadly smog that engulfs the capital as winter begins.

Yet recently, the newly elected local government appealed to the highest court to seek a modification of the restrictions.

The suggestion was allowing "environmentally conscious pyrotechnics" – which have been questioned by conservation groups as being only approximately one-third less polluting – as a balance between "heritage and ecological concerns".

Legal Ruling and Implementation

Much to the frustration of medical and ecological activists, judges complied with the request, mandating that green firecrackers could be set off during specific time windows throughout the celebrations.

Throughout the festival evening, there was extensive disregard of the regulated periods across the capital, with little regulation regarding whether the firecrackers being used were actually the more environmentally friendly type.

Several air quality sensors throughout Delhi registered air quality reaching highest levels around late evening to some of the worst levels seen during celebrations in at least the past three years.

Cross-Border Effects

The widespread use of fireworks during the festival also sparked a controversy with neighbouring the neighboring country, with representatives in Pakistan's Punjab partially attributing deteriorating pollution levels in the city of Lahore on contaminants coming from across the border following the celebrations.

Chronic Pollution Crisis

Alarmingly severe levels of pollution in the capital have persisted as a significant challenge for fifteen-plus years, with the problem continuing to worsen.

During celebratory seasons, the concentration of hazardous particles in the atmosphere has been observed to spike to 70% higher the peak levels ever measured in China's capital, which was formerly regarded as the planet's dirtiest urban center.

Diverse Pollution Contributors

The situation in the city is resulting from a combination of different contributors including heavy vehicle emissions, dust, building projects, waste incineration and smoke from farm burning in nearby regions of neighboring agricultural zones.

In these regions, rural residents routinely set their fields on fire to expedite field preparation, creating toxic pollution that becomes contained over the metropolitan area as cooler air sets in.

Public Health and Financial Toll

Public health and economic impact on the approximately 33 million residents calling home the metropolitan zone is enormous, according to numerous research.

The contaminated air causes elevated rates of neurological, cardiovascular and lung disorders, and can result in oncological diseases.

Air quality crisis is calculated to be causing approximately 10k early mortalities each year in Delhi.