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As Tuesday dawned citizens of the planet's dirtiest urban center found themselves breathing dangerously toxic air that fell into the "critical" level.

Alarming Air Quality Levels

Various sections of Delhi registered an AQI above 500, which translates to ten times the safe limit recommended by the WHO.

In some locations, readings of toxic particulate matter hit highs of 1800, representing fifteen to twenty times exceeding healthy levels.

Firecracker Ban and New Policy Shifts

Since 2020, authorities had implemented a comprehensive restriction on the sale and use of firecrackers during the Festival of Lights due to their significant contribution to the dangerous haze that engulfs the metropolis as colder weather approaches.

However earlier this year, the current local administration appealed to the judicial authority to seek a easing of the prohibition.

They proposed allowing "eco-friendly fireworks" – which have been doubted by conservation groups as being only approximately one-third less polluting – as a middle ground between "cultural practices and ecological concerns".

Legal Ruling and Enforcement

Much to the frustration of environmental and health campaigners, judicial authorities agreed to the appeal, specifying that green firecrackers could be used during designated periods throughout the festival.

On Monday night, there was extensive flouting of the regulated periods across the city, with insufficient regulation regarding whether the fireworks being used were actually the more environmentally friendly version.

Many air quality sensors throughout the capital showed pollution spiking around late evening to the most severe levels seen during Diwali in at least recent memory.

International Effects

Extensive ignition of pyrotechnics during the celebrations also initiated a blame game with bordering Pakistan, with authorities in Pakistan's Punjab partly blaming worsening pollution levels in their urban centers on hazardous particles coming from across the border following the events.

Persistent Pollution Issue

The dangerously high levels of atmospheric toxins in the city have persisted as a major issue for more than 15 years, with the situation continuing to worsen.

Around the festival period, the amount of toxic airborne contaminants in the atmosphere has been observed to spike to 70% higher the worst readings ever recorded in Beijing, which was once considered as the world's most polluted metropolis.

Diverse Pollution Sources

This crisis in Delhi is resulting from a mix of different contributors including heavy vehicle emissions, airborne particles, development work, waste incineration and pollutants from crop residue ignition in adjacent states of farming communities.

In these regions, agricultural workers regularly burn crop residue to prepare for next season, generating toxic smog that remains stagnant over the capital as winter air descends.

Medical and Economic Impact

Public health and economic consequences on the roughly thirty-three million people calling home the Delhi area is significant, according to numerous studies.

This pollution leads to high levels of neurological, heart and circulatory and lung disorders, and can result in oncological diseases.

Environmental contamination is projected to be responsible for approximately 10k untimely mortalities annually in Delhi.