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On Tuesday morning citizens of this heavily contaminated metropolis encountered breathing dangerously toxic air that registered in the "alarming" range.

Extremely High Pollution Levels

Several parts of the capital recorded an pollution measurement above 500, which represents 10x the healthy threshold established by the global health authority.

In some locations, readings of toxic particulate matter reached peaks of eighteen hundred, amounting to 15 to 20 times above healthy limits.

Pyrotechnics Restrictions and New Policy Shifts

For the past four years, authorities had enforced a total prohibition on the sale and use of fireworks during the Festival of Lights due to their substantial impact to the dangerous pollution that blankets the capital as the cold season sets in.

However earlier this year, the newly elected regional government approached the highest court to propose a easing of the ban.

The suggestion was allowing "eco-friendly fireworks" – which have been criticized by conservation groups as being only approximately one-third lower impact – as a balance between "heritage and environment".

Judicial Verdict and Reality

Much to the frustration of medical and ecological advocates, judges agreed to the appeal, specifying that environmentally conscious fireworks could be set off during specific periods throughout the festival.

On Monday night, there was extensive disregard of the time restrictions across the metropolis, with minimal monitoring regarding whether the pyrotechnics being used were actually the more environmentally friendly type.

Many monitoring devices throughout the city recorded contamination reaching highest levels around the night hours to the most severe levels recorded during Diwali in at least three years.

International Effects

Extensive ignition of pyrotechnics during Diwali also sparked a dispute with adjacent Pakistan, with representatives in Pakistan's Punjab pointing to deteriorating pollution levels in their urban centers on pollutants traveling from neighboring India following the events.

Long-Standing Pollution Crisis

The dangerously high levels of pollution in the capital have remained as a serious challenge for more than 15 years, with the situation continuing to worsen.

During the festival period, the amount of hazardous airborne contaminants in the air has been found to increase dramatically to seventy percent above the peak levels ever measured in China's capital, which was previously considered as the planet's dirtiest urban center.

Various Contamination Factors

The problem in the capital is attributed to a combination of different contributors including transportation pollution, construction debris, development work, garbage fires and smoke from farm burning in neighbouring regions of farming communities.

In these regions, rural residents regularly set their fields on fire to prepare for next season, creating hazardous smog that then gets trapped over the metropolitan area as winter air arrives.

Medical and Economic Toll

The economic and health toll on the approximately 33 million residents residing in the Delhi area is enormous, according to multiple investigations.

These hazardous conditions causes increased incidence of neurological, heart and circulatory and breathing disorders, and can potentially cause oncological diseases.

Environmental contamination is calculated to be responsible for 10,000 untimely deaths each year in the capital.