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As Tuesday dawned residents of this heavily contaminated metropolis found themselves inhaling dangerously toxic air that fell into the "severe" range.

Extremely High Air Quality Levels

Several parts of the capital showed an air quality index above 500, which equals ten times the healthy level recommended by the global health authority.

Certain monitoring stations, concentrations of dangerous airborne particles soared to of 1800, equating to fifteen to twenty times exceeding acceptable limits.

Pyrotechnics Restrictions and Recent Policy Shifts

For the past four years, authorities had enforced a complete ban on the sale and use of fireworks during Diwali due to their significant contribution to the hazardous smog that covers the metropolis as the cold season begins.

Nevertheless recently, the current local administration appealed to the judicial authority to seek a relaxation of the ban.

The suggestion was allowing "environmentally conscious pyrotechnics" – previously doubted by conservation groups as being only about 30% less polluting – as a middle ground between "tradition and public health".

Judicial Ruling and Reality

Despite concerns of medical and ecological advocates, judicial authorities approved the appeal, stipulating that eco-friendly pyrotechnics could be ignited during specific time windows throughout the festival.

Throughout the festival evening, there was widespread disregard of the time restrictions across the metropolis, with insufficient regulation regarding whether the firecrackers being used were actually the more environmentally friendly variety.

Many air quality sensors throughout Delhi recorded air quality spiking around midnight to extremely hazardous levels seen during celebrations in at least the past three years.

Regional Implications

The widespread use of pyrotechnics during the celebrations also triggered a dispute with bordering the neighboring country, with authorities in Pakistani the Punjab region partly blaming declining air quality in their urban centers on hazardous particles originating in neighboring India following the events.

Long-Standing Environmental Problem

Alarmingly severe readings of atmospheric toxins in the capital have remained as a serious problem for more than 15 years, with the problem gradually deteriorating.

Around Diwali, the amount of hazardous airborne contaminants in the air has been observed to increase dramatically to significantly exceeding the worst readings ever documented in the Chinese city, which was previously considered as the planet's dirtiest city.

Multiple Contamination Factors

The situation in the capital is resulting from a mix of different contributors including heavy vehicle emissions, construction debris, building projects, rubbish burning and smoke from agricultural fires in neighbouring regions of farming communities.

Within these states, agricultural workers regularly set their fields on fire to prepare for next season, creating dangerous pollution that then gets trapped over the city as cooler air arrives.

Medical and Economic Consequences

Both financial and medical consequences on the approximately 33 million people residing in the Delhi area is substantial, according to numerous investigations.

This pollution causes elevated rates of neurological, cardiovascular and lung disorders, and can potentially cause malignancies.

Environmental contamination is calculated to be responsible for 10,000 early deaths annually in the city.