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Tuesday brought residents of the world's most polluted city encountered breathing severely hazardous air that was classified as the "severe" level.

Extremely High Air Quality Levels

Various sections of the city registered an air quality index above 500, which equals a tenfold increase over the healthy limit established by the World Health Organization.

Certain monitoring stations, concentrations of dangerous airborne particles reached peaks of eighteen hundred, equating to 15 to 20 times above safe limits.

Firecracker Restrictions and Recent Policy Shifts

For the past four years, the government had implemented a comprehensive restriction on the purchase and ignition of pyrotechnics during Diwali due to their significant contribution to the deadly haze that engulfs the metropolis as the cold season begins.

However recently, the recently formed regional government approached the supreme court to propose a easing of the ban.

Officials advocated for allowing "eco-friendly fireworks" – previously criticized by environmental experts as being only about 30% reduced emissions – as a balance between "heritage and public health".

Judicial Ruling and Implementation

Despite concerns of environmental and health advocates, judges complied with the proposal, specifying that green firecrackers could be set off during specific hours throughout the festival.

Throughout the festival evening, there was extensive flouting of the regulated periods across the city, with little regulation regarding whether the pyrotechnics being used were actually the supposedly greener version.

Several recording stations throughout the city recorded contamination peaking around late evening to the most severe readings seen during celebrations in at least the past three years.

Cross-Border Effects

Extensive ignition of pyrotechnics during Diwali also initiated a dispute with neighbouring Pakistan, with officials in Pakistani the Punjab region partly blaming worsening pollution levels in the city of Lahore on pollutants traveling from India following the festivities.

Persistent Environmental Problem

The dangerously high concentrations of atmospheric toxins in the capital have remained as a serious issue for fifteen-plus years, with the problem showing no improvement.

Near Diwali, the levels of toxic airborne contaminants in the environment has been observed to increase dramatically to seventy percent above the peak readings ever documented in China's capital, which was once considered as the globally most contaminated urban center.

Diverse Contamination Sources

The problem in the capital is resulting from a combination of different contributors including automobile exhaust, dust, development work, garbage fires and smoke from crop residue ignition in adjacent regions of neighboring agricultural zones.

Within these states, rural residents illegally set their fields on fire to clear them quickly, creating dangerous pollution that then gets trapped over the capital as colder air descends.

Medical and Economic Impact

Both financial and medical impact on the nearly 33 million inhabitants living in the capital region is substantial, according to multiple research.

These hazardous conditions leads to elevated rates of neurological, cardiovascular and breathing disorders, and can potentially cause malignancies.

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