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Tuesday brought residents of the world's most polluted city found themselves breathing dangerously toxic air that fell into the "severe" level.

Alarming Air Quality Levels

Several parts of Delhi registered an air quality index over 500, which translates to a tenfold increase over the healthy limit set by the global health authority.

In some locations, levels of dangerous airborne particles hit highs of 1,800, equating to 15-20x above safe standards.

Firecracker Prohibition and Recent Policy Shifts

Since 2020, authorities had implemented a comprehensive restriction on the purchase and ignition of pyrotechnics during the Festival of Lights due to their substantial impact to the deadly smog that blankets the metropolis as winter begins.

Nevertheless in recent months, the current city administration appealed to the highest court to seek a modification of the restrictions.

They proposed allowing "eco-friendly fireworks" – previously criticized by environmental experts as being only approximately one-third reduced emissions – as a compromise between "tradition and public health".

Legal Decision and Reality

Despite concerns of medical and ecological activists, the court complied with the appeal, mandating that green firecrackers could be ignited during limited periods throughout the celebrations.

Throughout the festival evening, there was extensive disregard of the regulated periods across the city, with insufficient enforcement regarding whether the fireworks being used were actually the supposedly greener variety.

Many air quality sensors throughout Delhi showed pollution peaking around the night hours to the most severe measurements recorded during Diwali in at least the past three years.

Regional Consequences

The widespread use of pyrotechnics during Diwali also initiated a dispute with adjacent Pakistan, with authorities in Pakistani the Punjab region partly blaming declining atmospheric conditions in their urban centers on contaminants coming from neighboring India following the celebrations.

Persistent Pollution Issue

Extremely elevated concentrations of air contamination in the city have continued as a significant challenge for fifteen-plus years, with the condition showing no improvement.

During Diwali, the levels of toxic particles in the environment has been observed to spike to significantly exceeding the peak records ever documented in Beijing, which was formerly regarded as the globally most contaminated urban center.

Multiple Pollution Sources

This crisis in Delhi is caused by a mix of various sources including transportation pollution, airborne particles, construction activities, waste incineration and smoke from farm burning in neighbouring regions of neighboring agricultural zones.

Throughout these areas, farmers illegally set their fields on fire to expedite field preparation, creating dangerous haze that remains stagnant over the capital as winter air descends.

Medical and Economic Toll

Both financial and medical toll on the roughly thirty-three million people living in the capital region is substantial, according to multiple investigations.

This pollution causes elevated rates of nervous system, cardiovascular and breathing conditions, and can potentially cause cancer.

Environmental contamination is estimated to be causing 10,000 premature mortalities per year in Delhi.