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Tuesday brought citizens of this heavily contaminated metropolis found themselves inhaling severely hazardous air that was classified as the "severe" level.

Extremely High Pollution Levels

Multiple areas of the city showed an pollution measurement exceeding 500, which translates to 10x the healthy level set by the global health authority.

In some locations, levels of PM2.5 and PM10 reached peaks of eighteen hundred, representing 15 to 20 times exceeding acceptable standards.

Pyrotechnics Restrictions and New Changes

Since 2020, authorities had enforced a comprehensive restriction on the distribution and bursting of fireworks during the Festival of Lights due to their substantial impact to the deadly pollution that covers the metropolis as the cold season sets in.

However earlier this year, the current regional government approached the supreme court to request a easing of the prohibition.

They proposed allowing "environmentally conscious pyrotechnics" – previously doubted by environmentalists as being only about 30% reduced emissions – as a middle ground between "tradition and ecological concerns".

Court Ruling and Implementation

Despite concerns of environmental and health activists, the court agreed to the request, mandating that eco-friendly pyrotechnics could be used during specific time windows throughout the festival.

Throughout the festival evening, there was widespread disregard of the time restrictions across the metropolis, with minimal monitoring regarding whether the pyrotechnics being used were actually the more environmentally friendly type.

Numerous monitoring devices throughout the capital recorded pollution peaking around late evening to extremely hazardous measurements recorded during the festival in at least the past three years.

Cross-Border Effects

The widespread use of firecrackers during the festival also sparked a controversy with neighbouring Pakistan, with officials in Pakistan's Punjab partly blaming declining air quality in the city of Lahore on pollutants originating in neighboring India following the events.

Persistent Environmental Crisis

Extremely elevated levels of pollution in the city have continued as a significant problem for fifteen-plus years, with the condition showing no improvement.

During the festival period, the concentration of hazardous airborne contaminants in the environment has been documented to increase dramatically to significantly exceeding the peak levels ever recorded in the Chinese city, which was formerly considered as the world's most polluted city.

Diverse Pollution Contributors

The situation in Delhi is attributed to a convergence of different contributors including transportation pollution, construction debris, construction activities, garbage fires and haze from agricultural fires in nearby regions of neighboring agricultural zones.

In these regions, rural residents regularly set their fields on fire to prepare for next season, creating toxic pollution that remains stagnant over the city as cooler air sets in.

Health and Financial Impact

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

This pollution leads to increased incidence of neurological, cardiovascular and lung diseases, and can result in cancer.

Environmental contamination is estimated to be responsible for ten thousand premature deaths annually in Delhi.