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Tuesday brought inhabitants of the planet's dirtiest urban center encountered breathing dangerously toxic air that registered in the "alarming" range.

Extremely High Air Quality Levels

Multiple areas of the capital showed an air quality index exceeding 500, which represents 10x the safe level established by the World Health Organization.

Certain monitoring stations, concentrations of dangerous airborne particles reached peaks of 1800, equating to 15-20x higher than safe levels.

Fireworks Ban and New Policy Shifts

Since 2020, authorities had implemented a complete ban on the distribution and bursting of fireworks during Diwali due to their major role to the dangerous pollution that engulfs the metropolis as the cold season sets in.

Nevertheless earlier this year, the recently formed city government approached the highest court to seek a modification of the restrictions.

They proposed allowing "green crackers" – previously doubted by conservation groups as being only about 30% less polluting – as a middle ground between "tradition and environment".

Judicial Ruling and Reality

To the disappointment of public health and environmental advocates, judges agreed to the appeal, stipulating that green firecrackers could be ignited during specific periods throughout the celebrations.

On Monday night, there was extensive flouting of the time restrictions across the city, with little regulation regarding whether the pyrotechnics being used were actually the eco-friendly variety.

Several monitoring devices throughout the capital recorded contamination peaking around the night hours to extremely hazardous levels seen during Diwali in at least three years.

Cross-Border Effects

Extensive ignition of firecrackers during the festival also triggered a dispute with bordering Pakistan, with authorities in Pakistan's Punjab pointing to worsening pollution levels in the city of Lahore on contaminants traveling from India following the events.

Long-Standing Pollution Issue

The dangerously high concentrations of atmospheric toxins in the capital have persisted as a serious issue for fifteen-plus years, with the problem gradually deteriorating.

Around the festival period, the concentration of toxic particles in the air has been observed to increase dramatically to significantly exceeding the most severe readings ever documented in Beijing, which was previously regarded as the world's most polluted city.

Diverse Pollution Sources

The problem in Delhi is resulting from a mix of different contributors including heavy vehicle emissions, dust, building projects, rubbish burning and smoke from farm burning in neighbouring areas of farming communities.

In these regions, rural residents routinely set their fields on fire to expedite field preparation, producing hazardous haze that becomes contained over the city as colder air descends.

Public Health and Financial Consequences

Public health and economic impact on the roughly thirty-three million people residing in the capital region is significant, according to various studies.

These hazardous conditions results in elevated rates of nervous system, heart and circulatory and lung disorders, and can even lead to oncological diseases.

The pollution is estimated to be accounting for 10,000 premature mortalities per year in the capital.