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Tuesday brought citizens of the world's most polluted city encountered breathing severely hazardous air that registered in the "severe" category.

Record-Breaking Pollution Measurements

Various sections of Delhi registered an air quality index exceeding 500, which equals a tenfold increase over the recommended level set by the World Health Organization.

Certain monitoring stations, levels of toxic particulate matter hit highs of 1,800, amounting to 15-20x higher than healthy limits.

Pyrotechnics Ban and New Changes

Beginning in 2020, officials had maintained a total prohibition on the sale and use of fireworks during Diwali due to their substantial impact to the deadly haze that covers the capital as colder weather approaches.

Yet recently, the current regional government petitioned the highest court to propose a modification of the restrictions.

The suggestion was allowing "environmentally conscious pyrotechnics" – previously questioned by environmental experts as being only about 30% less polluting – as a compromise between "heritage and public health".

Legal Ruling and Enforcement

To the disappointment of public health and environmental activists, the court complied with the request, specifying that eco-friendly pyrotechnics could be used during limited time windows throughout the festival.

Throughout the festival evening, there was extensive flouting of the designated hours across the metropolis, with minimal monitoring regarding whether the fireworks being used were actually the eco-friendly variety.

Several recording stations throughout Delhi registered pollution spiking around late evening to some of the worst measurements recorded during the festival in at least recent memory.

Cross-Border Effects

The proliferation of pyrotechnics during the festival also triggered a controversy with bordering the neighboring country, with representatives in Pakistani the Punjab region pointing to deteriorating pollution levels in Lahore on pollutants traveling from India following the celebrations.

Chronic Environmental Issue

The dangerously high readings of air contamination in the city have persisted as a significant problem for fifteen-plus years, with the problem gradually deteriorating.

Near Diwali, the concentration of toxic particulate matter in the environment has been documented to shoot up to significantly exceeding the most severe levels ever measured in the Chinese city, which was previously viewed as the world's most polluted city.

Diverse Pollution Contributors

The problem in Delhi is caused by a mix of various sources including heavy vehicle emissions, construction debris, construction activities, rubbish burning and smoke from crop residue ignition in neighbouring regions of Punjab and Haryana.

Within these states, agricultural workers illegally set their fields on fire to expedite field preparation, creating toxic smog that remains stagnant over the city as colder air descends.

Medical and Economic Consequences

The economic and health consequences on the roughly thirty-three million inhabitants living in the metropolitan zone is enormous, according to multiple investigations.

This pollution leads to increased incidence of neurological, cardiovascular and breathing disorders, and can result in malignancies.

Environmental contamination is calculated to be accounting for approximately 10k premature fatalities annually in Delhi.