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Tuesday brought citizens of the world's most polluted city found themselves inhaling severely hazardous air that registered in the "critical" level.

Extremely High Pollution Levels

Several parts of Delhi registered an air quality index over 500, which equals 10x the recommended level recommended by the global health authority.

In some locations, levels of toxic particulate matter soared to of 1,800, representing 15 to 20 times higher than acceptable limits.

Pyrotechnics Restrictions and New Changes

Since 2020, officials had maintained a comprehensive restriction on the purchase and ignition of firecrackers during Diwali due to their major role to the deadly pollution that covers the capital as winter sets in.

Nevertheless in recent months, the current regional government approached the supreme court to request a modification of the ban.

They proposed allowing "eco-friendly fireworks" – previously doubted by environmentalists as being only about 30% reduced emissions – as a middle ground between "heritage and ecological concerns".

Legal Ruling and Implementation

Despite concerns of public health and environmental activists, the court agreed to the appeal, stipulating that environmentally conscious fireworks could be set off during designated time windows throughout the festival.

On Monday night, there was widespread flouting of the designated hours across the capital, with insufficient regulation regarding whether the firecrackers being used were actually the eco-friendly variety.

Several air quality sensors throughout the city registered air quality reaching highest levels around late evening to some of the worst measurements observed during Diwali in at least the past three years.

Cross-Border Consequences

The widespread use of fireworks during the festival also sparked a dispute with neighbouring Pakistan, with representatives in Pakistan's Punjab province pointing to declining pollution levels in their urban centers on contaminants traveling from across the border following the celebrations.

Long-Standing Environmental Crisis

Alarmingly severe concentrations of pollution in Delhi have continued as a serious problem for fifteen-plus years, with the problem gradually deteriorating.

Around Diwali, the amount of hazardous airborne contaminants in the air has been found to shoot up to seventy percent above the peak levels ever documented in the Chinese city, which was once regarded as the planet's dirtiest metropolis.

Diverse Contamination Sources

This crisis in the city is caused by a convergence of multiple factors including heavy vehicle emissions, airborne particles, construction activities, rubbish burning and pollutants from agricultural fires in neighbouring states of Punjab and Haryana.

In these regions, agricultural workers illegally ignite agricultural waste to prepare for next season, producing toxic pollution that remains stagnant over the city as winter air descends.

Medical and Financial Consequences

Public health and economic toll on the roughly thirty-three million residents living in the metropolitan zone is enormous, according to various studies.

The contaminated air causes elevated rates of nervous system, cardiovascular and respiratory conditions, and can result in malignancies.

The pollution is calculated to be accounting for ten thousand premature fatalities annually in the city.