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Tuesday brought residents of the planet's dirtiest urban center encountered breathing extremely polluted air that fell into the "critical" category.

Alarming Pollution Levels

Various sections of the city showed an AQI exceeding 500, which translates to 10x the healthy limit established by the World Health Organization.

Certain monitoring stations, levels of dangerous airborne particles soared to of 1,800, equating to 15-20x higher than safe limits.

Fireworks Restrictions and Recent Developments

For the past four years, authorities had maintained a comprehensive restriction on the purchase and ignition of fireworks during celebrations due to their substantial impact to the hazardous haze that blankets the capital as colder weather approaches.

However in recent months, the newly elected local administration approached the judicial authority to propose a easing of the ban.

The suggestion was allowing "environmentally conscious pyrotechnics" – historically criticized by environmentalists as being only approximately one-third reduced emissions – as a compromise between "cultural practices and public health".

Judicial Verdict and Enforcement

Despite concerns of medical and ecological advocates, the court approved the request, mandating that environmentally conscious fireworks could be ignited during limited hours throughout the festival.

During the celebrations, there was extensive disregard of the designated hours across the city, with insufficient regulation regarding whether the fireworks being used were actually the supposedly greener version.

Many recording stations throughout the capital registered pollution reaching highest levels around late evening to some of the worst measurements observed during the festival in at least recent memory.

International Consequences

Extensive ignition of fireworks during Diwali also triggered a dispute with neighbouring Pakistan, with representatives in Pakistan's the Punjab region partially attributing worsening atmospheric conditions in their urban centers on contaminants coming from neighboring India following the festivities.

Persistent Pollution Problem

The dangerously high levels of air contamination in Delhi have persisted as a serious issue for over a decade and a half, with the situation showing no improvement.

Around celebratory seasons, the concentration of hazardous particulate matter in the air has been documented to shoot up to 70% higher the most severe records ever measured in China's capital, which was previously regarded as the world's most polluted urban center.

Diverse Contamination Contributors

The problem in Delhi is caused by a mix of various sources including transportation pollution, construction debris, construction activities, waste incineration and smoke from farm burning in neighbouring states of Punjab and Haryana.

Within these states, farmers illegally burn crop residue to prepare for next season, generating toxic haze that remains stagnant over the metropolitan area as cooler air arrives.

Health and Financial Consequences

Both financial and medical toll on the approximately 33 million residents living in the capital region is enormous, according to various research.

The contaminated air results in high levels of nervous system, heart and circulatory and lung diseases, and can even lead to cancer.

The pollution is calculated to be accounting for ten thousand untimely mortalities per year in Delhi.