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As Tuesday dawned citizens of the world's most polluted city found themselves exposed to dangerously toxic air that fell into the "critical" category.

Alarming Air Quality Readings

Several parts of the capital registered an pollution measurement over 500, which represents 10x the healthy level set by the WHO.

In some locations, levels of dangerous airborne particles hit highs of 1,800, representing 15-20x exceeding acceptable limits.

Fireworks Restrictions and Recent Policy Shifts

Since 2020, authorities had implemented a comprehensive restriction on the purchase and ignition of fireworks during the Festival of Lights due to their major role to the hazardous pollution that engulfs the city as winter approaches.

Nevertheless in recent months, the recently formed regional administration appealed to the supreme court to request a easing of the ban.

They proposed allowing "environmentally conscious pyrotechnics" – previously criticized by environmental experts as being only approximately one-third less polluting – as a middle ground between "cultural practices and public health".

Court Ruling and Enforcement

To the disappointment of public health and environmental campaigners, judicial authorities complied with the proposal, stipulating that environmentally conscious fireworks could be ignited during designated hours throughout the Diwali.

On Monday night, there was widespread disregard of the designated hours across the metropolis, with minimal enforcement regarding whether the firecrackers being used were actually the eco-friendly type.

Several air quality sensors throughout Delhi recorded contamination reaching highest levels around late evening to the most severe readings seen during Diwali in at least recent memory.

International Consequences

The widespread use of firecrackers during the festival also initiated a controversy with neighbouring the neighboring country, with officials in Pakistan's Punjab partly blaming deteriorating air quality in their urban centers on pollutants traveling from neighboring India following the events.

Persistent Environmental Problem

Extremely elevated concentrations of air contamination in Delhi have remained as a major challenge for over a decade and a half, with the condition showing no improvement.

Around Diwali, the levels of dangerous particles in the air has been found to increase dramatically to seventy percent above the most severe records ever measured in China's capital, which was previously viewed as the planet's dirtiest city.

Diverse Pollution Factors

The situation in the capital is resulting from a combination of multiple factors including transportation pollution, dust, development work, waste incineration and haze from farm burning in neighbouring areas of farming communities.

Throughout these areas, rural residents illegally set their fields on fire to expedite field preparation, producing dangerous haze that then gets trapped over the capital as colder air sets in.

Public Health and Financial Consequences

The economic and health consequences on the nearly 33 million residents residing in the Delhi area is substantial, according to numerous research.

The contaminated air causes increased incidence of nervous system, cardiovascular and respiratory disorders, and can potentially cause malignancies.

Air quality crisis is calculated to be responsible for 10,000 early mortalities annually in the city.