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Tuesday brought citizens of this heavily contaminated metropolis were faced with inhaling severely hazardous air that fell into the "severe" category.

Alarming Air Quality Measurements

Multiple areas of the city showed an pollution measurement over 500, which equals a tenfold increase over the healthy level recommended by the WHO.

Certain monitoring stations, readings of dangerous airborne particles reached peaks of 1,800, equating to 15-20x above acceptable limits.

Firecracker Prohibition and Current Developments

Since 2020, officials had maintained a total prohibition on the sale and use of firecrackers during Diwali due to their substantial impact to the dangerous pollution that covers the capital as the cold season begins.

Yet in recent months, the newly elected city government approached the highest court to seek a easing of the ban.

The suggestion was allowing "green crackers" – historically doubted by conservation groups as being only approximately one-third reduced emissions – as a middle ground between "tradition and environment".

Legal Verdict and Reality

To the disappointment of medical and ecological campaigners, judicial authorities approved the appeal, specifying that green firecrackers could be set off during specific periods throughout the celebrations.

On Monday night, there was extensive violation of the regulated periods across the city, with minimal monitoring regarding whether the pyrotechnics being used were actually the more environmentally friendly variety.

Several air quality sensors throughout the capital showed contamination reaching highest levels around late evening to extremely hazardous measurements seen during the festival in at least the past three years.

Cross-Border Effects

The proliferation of pyrotechnics during the festival also triggered a dispute with bordering the neighboring country, with officials in Pakistan's Punjab partly blaming worsening air quality in Lahore on hazardous particles coming from India following the events.

Persistent Environmental Problem

The dangerously high readings of atmospheric toxins in Delhi have persisted as a significant challenge for more than 15 years, with the situation continuing to worsen.

During Diwali, the levels of hazardous particles in the atmosphere has been observed to spike to significantly exceeding the peak levels ever recorded in China's capital, which was formerly considered as the world's most polluted metropolis.

Multiple Contamination Factors

The problem in the city is attributed to a convergence of multiple factors including heavy vehicle emissions, construction debris, building projects, waste incineration and haze from agricultural fires in neighbouring regions of Punjab and Haryana.

Throughout these areas, rural residents regularly ignite agricultural waste to prepare for next season, producing hazardous smog that becomes contained over the city as winter air descends.

Public Health and Economic Toll

Public health and economic impact on the roughly thirty-three million inhabitants living in the metropolitan zone is substantial, according to multiple studies.

These hazardous conditions results in elevated rates of nervous system, cardiovascular and respiratory disorders, and can result in oncological diseases.

Environmental contamination is estimated to be responsible for ten thousand premature mortalities each year in Delhi.