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On Tuesday morning inhabitants of the planet's dirtiest urban center were faced with breathing severely hazardous air that registered in the "critical" range.

Alarming Air Quality Levels

Multiple areas of Delhi showed an air quality index exceeding 500, which represents 10x the healthy threshold set by the global health authority.

In some locations, levels of PM2.5 and PM10 hit highs of eighteen hundred, amounting to fifteen to twenty times exceeding safe levels.

Pyrotechnics Prohibition and New Policy Shifts

Since 2020, authorities had implemented a total prohibition on the distribution and bursting of fireworks during Diwali due to their substantial impact to the dangerous haze that blankets the capital as the cold season sets in.

Nevertheless in recent months, the recently formed city government appealed to the judicial authority to propose a easing of the ban.

They proposed allowing "green crackers" – previously criticized by conservation groups as being only approximately one-third reduced emissions – as a compromise between "heritage and ecological concerns".

Judicial Decision and Enforcement

Despite concerns of medical and ecological campaigners, the court approved the proposal, mandating that eco-friendly pyrotechnics could be used during specific hours throughout the celebrations.

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

Several monitoring devices throughout the city showed pollution peaking around late evening to the most severe readings observed during Diwali in at least recent memory.

International Consequences

The proliferation of firecrackers during the celebrations also sparked a controversy with adjacent Pakistan, with representatives in Pakistan's the Punjab region partly blaming deteriorating atmospheric conditions in the city of Lahore on pollutants originating in India following the events.

Long-Standing Pollution Issue

The dangerously high levels of air contamination in the capital have continued as a significant issue for over a decade and a half, with the situation showing no improvement.

Around the festival period, the concentration of hazardous particulate matter in the environment has been documented to increase dramatically to 70% higher the most severe readings ever recorded in China's capital, which was formerly viewed as the globally most contaminated metropolis.

Multiple Contamination Sources

The situation in the capital is caused by a convergence of multiple factors including automobile exhaust, airborne particles, construction activities, garbage fires and haze from farm burning in adjacent regions of farming communities.

Throughout these areas, rural residents regularly burn crop residue to prepare for next season, producing toxic haze that then gets trapped over the city as colder air sets in.

Public Health and Economic Consequences

The economic and health toll on the approximately 33 million residents calling home the Delhi area is substantial, according to multiple investigations.

This pollution results in high levels of neurological, cardiovascular and lung diseases, and can even lead to cancer.

Environmental contamination is estimated to be causing approximately 10k early mortalities annually in Delhi.