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As Tuesday dawned residents of the world's most polluted city found themselves inhaling extremely polluted air that fell into the "critical" level.

Alarming Air Quality Measurements

Multiple areas of Delhi showed an pollution measurement over 500, which equals 10x the healthy level set by the World Health Organization.

In some locations, levels of dangerous airborne particles soared to of eighteen hundred, amounting to 15-20x exceeding safe standards.

Pyrotechnics Restrictions and Recent Policy Shifts

For the past four years, authorities had maintained a complete ban on the distribution and bursting of fireworks during the Festival of Lights due to their significant contribution to the dangerous haze that engulfs the metropolis as the cold season sets in.

Yet in recent months, the current regional government appealed to the supreme court to request a modification of the ban.

The suggestion was allowing "green crackers" – previously questioned by conservation groups as being only about 30% reduced emissions – as a compromise between "cultural practices and ecological concerns".

Legal Verdict and Enforcement

Despite concerns of medical and ecological activists, judicial authorities agreed to the appeal, stipulating that green firecrackers could be ignited during designated periods throughout the festival.

Throughout the festival evening, there was considerable flouting of the regulated periods across the metropolis, with little regulation regarding whether the firecrackers being used were actually the eco-friendly type.

Numerous recording stations throughout the city showed air quality reaching highest levels around the night hours to some of the worst levels seen during celebrations in at least recent memory.

Cross-Border Consequences

The widespread use of fireworks during the festival also initiated a dispute with adjacent Pakistan, with authorities in Pakistani Punjab partially attributing deteriorating pollution levels in the city of Lahore on contaminants traveling from across the border following the celebrations.

Persistent Pollution Problem

Alarmingly severe concentrations of air contamination in the city have persisted as a significant challenge for fifteen-plus years, with the situation continuing to worsen.

Around celebratory seasons, the levels of dangerous particulate matter in the air has been observed to increase dramatically to 70% higher the most severe records ever documented in China's capital, which was once viewed as the planet's dirtiest city.

Various Pollution Contributors

The problem in the capital is resulting from a convergence of various sources including transportation pollution, construction debris, construction activities, rubbish burning and smoke from crop residue ignition in nearby states of neighboring agricultural zones.

In these regions, farmers illegally burn crop residue to expedite field preparation, creating hazardous smog that becomes contained over the city as winter air arrives.

Medical and Financial Toll

Public health and economic toll on the nearly 33 million people living in the capital region is substantial, according to multiple investigations.

This pollution leads to high levels of neurological, cardiovascular and respiratory diseases, and can potentially cause oncological diseases.

The pollution is projected to be responsible for ten thousand untimely mortalities each year in Delhi.