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Tuesday brought residents of this heavily contaminated metropolis found themselves breathing severely hazardous air that fell into the "alarming" level.

Record-Breaking Air Quality Measurements

Various sections of Delhi registered an air quality index exceeding 500, which translates to ten times the healthy level established by the WHO.

In some locations, levels of PM2.5 and PM10 soared to of 1800, equating to 15-20x exceeding acceptable limits.

Fireworks Prohibition and New Policy Shifts

Beginning in 2020, officials had maintained a complete ban on the purchase and ignition of firecrackers during Diwali due to their significant contribution to the hazardous smog that engulfs the metropolis as winter sets in.

Yet earlier this year, the recently formed regional government appealed to the judicial authority to request a modification of the ban.

They proposed allowing "eco-friendly fireworks" – previously questioned by environmentalists as being only approximately one-third reduced emissions – as a middle ground between "cultural practices and public health".

Judicial Decision and Reality

Much to the frustration of public health and environmental advocates, judges approved the proposal, stipulating that green firecrackers could be ignited during limited periods throughout the Diwali.

On Monday night, there was considerable disregard of the regulated periods across the metropolis, with insufficient enforcement regarding whether the fireworks being used were actually the eco-friendly type.

Numerous recording stations throughout the capital registered pollution peaking around midnight to extremely hazardous measurements observed during the festival in at least the past three years.

Cross-Border Implications

The widespread use of firecrackers during the festival also initiated a dispute with neighbouring Pakistan, with representatives in Pakistan's the Punjab region partly blaming worsening air quality in Lahore on contaminants originating in neighboring India following the festivities.

Persistent Environmental Problem

Alarmingly severe concentrations of pollution in the capital have remained as a major issue for over a decade and a half, with the problem showing no improvement.

During the festival period, the amount of dangerous particles in the atmosphere has been documented to increase dramatically to significantly exceeding the peak records ever measured in the Chinese city, which was previously viewed as the planet's dirtiest metropolis.

Diverse Pollution Sources

This crisis in the capital is caused by a mix of various sources including heavy vehicle emissions, airborne particles, development work, waste incineration and pollutants from crop residue ignition in nearby regions of farming communities.

In these regions, rural residents regularly burn crop residue to prepare for next season, creating hazardous smog that then gets trapped over the city as cooler air arrives.

Medical and Economic Impact

Public health and economic impact on the roughly thirty-three million inhabitants residing in the metropolitan zone is enormous, according to various research.

The contaminated air causes increased incidence of nervous system, heart and circulatory and respiratory disorders, and can potentially cause cancer.

The pollution is projected to be accounting for ten thousand early deaths annually in the capital.