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Tuesday brought residents of the world's most polluted city were faced with inhaling extremely polluted air that was classified as the "severe" range.

Extremely High Air Quality Measurements

Several parts of the capital registered an air quality index exceeding 500, which translates to ten times the safe limit set by the WHO.

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

Firecracker Ban and Current Changes

Beginning in 2020, authorities had maintained a comprehensive restriction on the sale and use of firecrackers during Diwali due to their significant contribution to the deadly haze that engulfs the city as winter approaches.

However earlier this year, the recently formed local administration approached the highest court to propose a easing of the restrictions.

They proposed allowing "environmentally conscious pyrotechnics" – previously questioned by environmentalists as being only approximately one-third reduced emissions – as a balance between "tradition and environment".

Judicial Verdict and Implementation

Despite concerns of public health and environmental activists, the court agreed to the appeal, mandating that green firecrackers could be used during specific periods throughout the festival.

Throughout the festival evening, there was extensive flouting of the regulated periods across the capital, with insufficient enforcement regarding whether the firecrackers being used were actually the eco-friendly variety.

Many monitoring devices throughout the city recorded pollution reaching highest levels around midnight to some of the worst readings observed during the festival in at least recent memory.

Cross-Border Consequences

Extensive ignition of fireworks during the festival also triggered a controversy with bordering the neighboring country, with authorities in Pakistan's Punjab province partly blaming worsening air quality in their urban centers on hazardous particles originating in neighboring India following the celebrations.

Persistent Pollution Crisis

The dangerously high concentrations of atmospheric toxins in the capital have continued as a major issue for more than 15 years, with the situation gradually deteriorating.

Around the festival period, the levels of dangerous particles in the air has been observed to shoot up to significantly exceeding the most severe records ever measured in the Chinese city, which was formerly considered as the planet's dirtiest urban center.

Various Contamination Contributors

The situation in the capital is caused by a convergence of various sources including heavy vehicle emissions, airborne particles, construction activities, rubbish burning and smoke from agricultural fires in nearby regions of Punjab and Haryana.

Within these states, farmers illegally ignite agricultural waste to clear them quickly, generating hazardous haze that becomes contained over the capital as winter air descends.

Medical and Economic Consequences

Public health and economic toll on the approximately 33 million people residing in the Delhi area is enormous, according to multiple research.

The contaminated air results in high levels of neurological, heart and circulatory and breathing diseases, and can result in malignancies.

The pollution is projected to be responsible for approximately 10k untimely mortalities annually in the capital.