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Tuesday brought inhabitants of the world's most polluted city found themselves exposed to dangerously toxic air that was classified as the "critical" category.

Extremely High Pollution Measurements

Several parts of the city recorded an AQI exceeding 500, which translates to ten times the safe level recommended by the WHO.

Particular areas, concentrations of PM2.5 and PM10 hit highs of eighteen hundred, representing 15-20x above safe standards.

Fireworks Restrictions and Current Policy Shifts

Since 2020, authorities had maintained a total prohibition on the sale and use of pyrotechnics during celebrations due to their significant contribution to the hazardous haze that covers the capital as the cold season approaches.

Nevertheless recently, the newly elected local leadership appealed to the judicial authority to propose a easing of the prohibition.

They proposed allowing "green crackers" – historically criticized by conservation groups as being only about 30% lower impact – as a middle ground between "cultural practices and environment".

Court Decision and Reality

Despite concerns of medical and ecological campaigners, judges approved the appeal, specifying that green firecrackers could be set off during designated time windows throughout the celebrations.

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

Several monitoring devices throughout the city recorded air quality spiking around midnight to some of the worst measurements seen during celebrations in at least three years.

Cross-Border Implications

The widespread use of fireworks during the celebrations also triggered a controversy with neighbouring Pakistan, with officials in Pakistan's the Punjab region partly blaming declining pollution levels in their urban centers on hazardous particles originating in India following the festivities.

Chronic Environmental Crisis

Extremely elevated readings of air contamination in the city have persisted as a significant challenge for fifteen-plus years, with the condition showing no improvement.

Around Diwali, the amount of dangerous airborne contaminants in the environment has been observed to shoot up to significantly exceeding the most severe records ever recorded in the Chinese city, which was once considered as the world's most polluted city.

Multiple Contamination Factors

This crisis in Delhi is caused by a convergence of different contributors including transportation pollution, airborne particles, development work, rubbish burning and haze from farm burning in nearby regions of farming communities.

Throughout these areas, farmers regularly set their fields on fire to expedite field preparation, generating dangerous haze that becomes contained over the capital as colder air sets in.

Health and Financial Toll

Both financial and medical toll on the approximately 33 million residents calling home the metropolitan zone is substantial, according to various investigations.

These hazardous conditions leads to increased incidence of nervous system, heart and circulatory and respiratory disorders, and can even lead to cancer.

The pollution is calculated to be responsible for 10,000 premature fatalities per year in the city.