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Tuesday brought inhabitants of this heavily contaminated metropolis were faced with exposed to dangerously toxic air that fell into the "alarming" range.

Alarming Pollution Measurements

Multiple areas of the capital recorded an air quality index over 500, which represents a tenfold increase over the healthy limit set by the WHO.

In some locations, concentrations of dangerous airborne particles reached peaks of 1,800, equating to 15-20x exceeding healthy standards.

Pyrotechnics Ban and Current Developments

For the past four years, officials had implemented a total prohibition on the sale and use of firecrackers during Diwali due to their significant contribution to the deadly smog that covers the metropolis as the cold season approaches.

However recently, the current regional leadership petitioned the highest court to request a easing of the ban.

The suggestion was allowing "eco-friendly fireworks" – previously doubted by conservation groups as being only approximately one-third lower impact – as a middle ground between "heritage and ecological concerns".

Legal Decision and Reality

Despite concerns of environmental and health activists, judges complied with the appeal, specifying that green firecrackers could be ignited during specific hours throughout the celebrations.

Throughout the festival evening, there was considerable flouting of the regulated periods across the city, with insufficient enforcement regarding whether the pyrotechnics being used were actually the eco-friendly variety.

Many air quality sensors throughout Delhi recorded contamination peaking around midnight to the most severe levels recorded during the festival in at least three years.

Cross-Border Effects

The proliferation of fireworks during the festival also triggered a dispute with bordering the neighboring country, with representatives in Pakistan's Punjab province pointing to deteriorating air quality in the city of Lahore on pollutants originating in neighboring India following the celebrations.

Chronic Pollution Crisis

Alarmingly severe concentrations of pollution in the city have persisted as a major challenge for more than 15 years, with the situation showing no improvement.

Near the festival period, the levels of dangerous particles in the atmosphere has been found to spike to 70% higher the worst levels ever measured in Beijing, which was previously considered as the world's most polluted metropolis.

Various Contamination Factors

The situation in the capital is resulting from a mix of various sources including heavy vehicle emissions, dust, development work, waste incineration and smoke from crop residue ignition in nearby regions of neighboring agricultural zones.

Throughout these areas, farmers illegally burn crop residue to expedite field preparation, producing dangerous pollution that then gets trapped over the capital as colder air arrives.

Medical and Financial Toll

The economic and health impact on the approximately 33 million inhabitants residing in the Delhi area is enormous, according to numerous investigations.

This pollution causes elevated rates of nervous system, cardiovascular and respiratory disorders, and can even lead to oncological diseases.

Air quality crisis is projected to be responsible for 10,000 untimely fatalities each year in the city.