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On Tuesday morning citizens of this heavily contaminated metropolis found themselves inhaling dangerously toxic air that fell into the "severe" category.

Alarming Pollution Levels

Various sections of the capital showed an AQI exceeding 500, which equals ten times the healthy limit set by the World Health Organization.

Certain monitoring stations, concentrations of PM2.5 and PM10 soared to of 1,800, amounting to 15 to 20 times above safe standards.

Fireworks Ban and New Developments

For the past four years, authorities had enforced a complete ban on the purchase and ignition of firecrackers during the Festival of Lights due to their significant contribution to the deadly smog that engulfs the city as colder weather sets in.

Yet in recent months, the recently formed city leadership approached the judicial authority to seek a easing of the prohibition.

The suggestion was allowing "eco-friendly fireworks" – historically questioned by environmental experts as being only approximately one-third less polluting – as a middle ground between "tradition and environment".

Legal Verdict and Reality

Despite concerns of environmental and health advocates, judges agreed to the request, specifying that green firecrackers could be ignited during specific hours throughout the festival.

On Monday night, there was widespread disregard of the regulated periods across the metropolis, with insufficient monitoring regarding whether the pyrotechnics being used were actually the more environmentally friendly variety.

Many air quality sensors throughout the city registered pollution peaking around midnight to some of the worst measurements recorded during Diwali in at least three years.

International Implications

Extensive ignition of fireworks during Diwali also sparked a controversy with neighbouring Pakistan, with officials in Pakistani Punjab partially attributing declining pollution levels in Lahore on hazardous particles originating in neighboring India following the events.

Long-Standing Pollution Crisis

Extremely elevated concentrations of air contamination in the capital have persisted as a major problem for fifteen-plus years, with the condition continuing to worsen.

Around celebratory seasons, the concentration of hazardous particulate matter in the air has been documented to spike to significantly exceeding the worst levels ever recorded in China's capital, which was previously considered as the planet's dirtiest city.

Multiple Pollution Sources

The problem in Delhi is resulting from a mix of different contributors including transportation pollution, airborne particles, development work, garbage fires and smoke from crop residue ignition in nearby areas of neighboring agricultural zones.

Throughout these areas, agricultural workers illegally burn crop residue to expedite field preparation, creating dangerous smog that becomes contained over the capital as colder air arrives.

Health and Financial Toll

Public health and economic impact on the roughly thirty-three million residents living in the capital region is substantial, according to numerous investigations.

The contaminated air causes increased incidence of neurological, cardiovascular and respiratory conditions, and can even lead to cancer.

Air quality crisis is estimated to be responsible for ten thousand untimely deaths per year in the city.