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As Tuesday dawned citizens of this heavily contaminated metropolis encountered exposed to severely hazardous air that registered in the "critical" range.

Record-Breaking Air Quality Levels

Several parts of Delhi showed an AQI above 500, which represents a tenfold increase over the recommended level recommended by the World Health Organization.

In some locations, levels of toxic particulate matter hit highs of 1800, representing 15-20x above acceptable levels.

Fireworks Ban and Current Policy Shifts

Beginning in 2020, authorities had implemented a comprehensive restriction on the distribution and bursting of firecrackers during celebrations due to their substantial impact to the deadly pollution that covers the city as winter approaches.

Nevertheless earlier this year, the recently formed local government petitioned the judicial authority to propose a relaxation of the restrictions.

They proposed allowing "green crackers" – previously questioned by conservation groups as being only approximately one-third reduced emissions – as a middle ground between "cultural practices and public health".

Legal Decision and Implementation

Much to the frustration of environmental and health campaigners, the court complied with the appeal, specifying that eco-friendly pyrotechnics could be ignited during designated periods throughout the celebrations.

On Monday night, there was considerable violation of the designated hours across the city, with minimal enforcement regarding whether the firecrackers being used were actually the more environmentally friendly version.

Many recording stations throughout Delhi showed air quality spiking around the night hours to the most severe measurements recorded during the festival in at least the past three years.

International Effects

Extensive ignition of firecrackers during the celebrations also triggered a dispute with adjacent the neighboring country, with authorities in Pakistani Punjab province pointing to deteriorating air quality in the city of Lahore on pollutants traveling from neighboring India following the events.

Long-Standing Environmental Issue

Extremely elevated readings of air contamination in the city have persisted as a significant problem for fifteen-plus years, with the condition showing no improvement.

During Diwali, the amount of hazardous airborne contaminants in the air has been documented to spike to significantly exceeding the worst readings ever documented in Beijing, which was previously viewed as the planet's dirtiest city.

Multiple Contamination Contributors

This crisis in the city is resulting from a combination of various sources including heavy vehicle emissions, construction debris, construction activities, waste incineration and haze from crop residue ignition in nearby areas of neighboring agricultural zones.

In these regions, farmers illegally burn crop residue to prepare for next season, generating toxic haze that remains stagnant over the metropolitan area as colder air sets in.

Public Health and Economic Impact

The economic and health toll on the nearly 33 million residents calling home the Delhi area is substantial, according to numerous research.

These hazardous conditions leads to high levels of nervous system, cardiovascular and lung disorders, and can result in malignancies.

The pollution is estimated to be responsible for ten thousand untimely mortalities annually in the capital.