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Tuesday brought citizens of the world's most polluted city encountered inhaling extremely polluted air that registered in the "severe" range.

Extremely High Air Quality Readings

Several parts of the city showed an pollution measurement over 500, which equals 10x the healthy limit established by the WHO.

Certain monitoring stations, levels of dangerous airborne particles soared to of 1,800, equating to 15-20x above healthy standards.

Pyrotechnics Restrictions and Current Policy Shifts

For the past four years, officials had maintained a comprehensive restriction on the sale and use of fireworks during Diwali due to their significant contribution to the dangerous smog that blankets the capital as winter approaches.

Yet in recent months, the recently formed regional government approached the highest court to propose a relaxation of the ban.

The suggestion was allowing "eco-friendly fireworks" – previously criticized by conservation groups as being only approximately one-third lower impact – as a middle ground between "heritage and public health".

Court Ruling and Implementation

Despite concerns of public health and environmental campaigners, judges agreed to the request, stipulating that green firecrackers could be used during designated time windows throughout the festival.

During the celebrations, there was widespread disregard of the regulated periods across the city, with minimal monitoring regarding whether the firecrackers being used were actually the more environmentally friendly version.

Numerous air quality sensors throughout the city recorded pollution reaching highest levels around the night hours to the most severe readings recorded during Diwali in at least three years.

International Effects

Extensive ignition of firecrackers during the festival also triggered a blame game with neighbouring the neighboring country, with authorities in Pakistan's Punjab partly blaming declining atmospheric conditions in the city of Lahore on hazardous particles originating in across the border following the celebrations.

Long-Standing Pollution Crisis

Alarmingly severe readings of pollution in the capital have remained as a significant challenge for fifteen-plus years, with the condition continuing to worsen.

Near Diwali, the concentration of hazardous airborne contaminants in the air has been documented to increase dramatically to seventy percent above the worst levels ever documented in China's capital, which was once viewed as the planet's dirtiest metropolis.

Multiple Contamination Sources

This crisis in Delhi is caused by a combination of multiple factors including transportation pollution, construction debris, construction activities, garbage fires and pollutants from crop residue ignition in adjacent states of Punjab and Haryana.

In these regions, farmers routinely ignite agricultural waste to prepare for next season, creating hazardous pollution that remains stagnant over the capital as cooler air descends.

Medical and Financial Consequences

The economic and health consequences on the roughly thirty-three million people calling home the metropolitan zone is enormous, according to various studies.

This pollution leads to high levels of neurological, heart and circulatory and respiratory diseases, and can potentially cause oncological diseases.

Environmental contamination is projected to be responsible for approximately 10k early deaths annually in Delhi.