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On Tuesday morning residents of the world's most polluted city were faced with breathing dangerously toxic air that registered in the "critical" range.

Extremely High Pollution Measurements

Various sections of the capital registered an AQI above 500, which translates to 10x the safe level established by the World Health Organization.

Particular areas, concentrations of PM2.5 and PM10 soared to of 1800, amounting to 15 to 20 times higher than safe standards.

Firecracker Ban and New Policy Shifts

Beginning in 2020, authorities had enforced a total prohibition on the sale and use of pyrotechnics during celebrations due to their significant contribution to the dangerous haze that covers the metropolis as colder weather sets in.

Nevertheless earlier this year, the recently formed city leadership petitioned the judicial authority to request a easing of the prohibition.

Officials advocated for allowing "eco-friendly fireworks" – previously questioned by environmental experts as being only roughly 30 percent lower impact – as a balance between "cultural practices and public health".

Judicial Decision and Implementation

Despite concerns of public health and environmental activists, the court agreed to the appeal, mandating that environmentally conscious fireworks could be ignited during designated periods throughout the Diwali.

On Monday night, there was extensive disregard of the regulated periods across the capital, with minimal monitoring regarding whether the firecrackers being used were actually the supposedly greener version.

Numerous air quality sensors throughout Delhi recorded air quality spiking around late evening to some of the worst readings recorded during Diwali in at least three years.

Cross-Border Effects

The proliferation of pyrotechnics during the festival also triggered a blame game with neighbouring the neighboring country, with representatives in Pakistan's Punjab pointing to worsening pollution levels in the city of Lahore on hazardous particles traveling from across the border following the festivities.

Persistent Pollution Issue

Alarmingly severe concentrations of atmospheric toxins in the city have continued as a significant problem for over a decade and a half, with the condition gradually deteriorating.

Around the festival period, the levels of dangerous airborne contaminants in the atmosphere has been observed to shoot up to significantly exceeding the most severe readings ever documented in the Chinese city, which was previously considered as the globally most contaminated metropolis.

Various Contamination Sources

The problem in the city is caused by a combination of multiple factors including automobile exhaust, construction debris, construction activities, waste incineration and haze from farm burning in adjacent regions of Punjab and Haryana.

Within these states, rural residents regularly ignite agricultural waste to prepare for next season, creating dangerous smog that becomes contained over the metropolitan area as colder air descends.

Health and Financial Consequences

The economic and health impact on the nearly 33 million residents residing in the metropolitan zone is substantial, according to multiple research.

These hazardous conditions leads to elevated rates of nervous system, heart and circulatory and respiratory diseases, and can result in malignancies.

Environmental contamination is estimated to be accounting for 10,000 early deaths per year in the city.