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Tuesday brought inhabitants of this heavily contaminated metropolis found themselves breathing dangerously toxic air that fell into the "alarming" range.

Extremely High Air Quality Measurements

Multiple areas of Delhi registered an pollution measurement over 500, which equals 10x the safe threshold set by the World Health Organization.

Particular areas, levels of dangerous airborne particles soared to of 1,800, amounting to 15-20x exceeding safe levels.

Fireworks Ban and Current Policy Shifts

For the past four years, authorities had enforced a total prohibition on the sale and use of fireworks during Diwali due to their substantial impact to the hazardous smog that blankets the city as winter approaches.

However in recent months, the recently formed regional government approached the judicial authority to propose a easing of the prohibition.

Officials advocated for allowing "environmentally conscious pyrotechnics" – which have been doubted by environmentalists as being only approximately one-third less polluting – as a balance between "cultural practices and public health".

Legal Decision and Reality

Despite concerns of public health and environmental activists, judges agreed to the appeal, mandating that green firecrackers could be set off during specific periods throughout the Diwali.

During the celebrations, there was extensive flouting of the time restrictions across the city, with minimal enforcement regarding whether the fireworks being used were actually the more environmentally friendly type.

Several monitoring devices throughout the capital registered contamination reaching highest levels around late evening to some of the worst readings observed during Diwali in at least three years.

International Consequences

The proliferation of firecrackers during the celebrations also triggered a controversy with neighbouring the neighboring country, with authorities in Pakistan's Punjab partly blaming worsening atmospheric conditions in the city of Lahore on pollutants coming from India following the celebrations.

Long-Standing Environmental Crisis

The dangerously high concentrations of air contamination in the capital have remained as a major challenge for over a decade and a half, with the condition gradually deteriorating.

During Diwali, the levels of hazardous particulate matter in the atmosphere has been observed to spike to seventy percent above the most severe readings ever measured in Beijing, which was formerly considered as the world's most polluted urban center.

Multiple Contamination Sources

The problem in Delhi is attributed to a combination of various sources including transportation pollution, airborne particles, development work, garbage fires and haze from crop residue ignition in nearby states of neighboring agricultural zones.

Within these states, agricultural workers routinely ignite agricultural waste to expedite field preparation, generating toxic haze that then gets trapped over the metropolitan area as colder air sets in.

Public Health and Economic Toll

Public health and economic impact on the approximately 33 million people living in the capital region is substantial, according to multiple studies.

This pollution leads to high levels of nervous system, heart and circulatory and lung diseases, and can potentially cause oncological diseases.

Air quality crisis is estimated to be causing approximately 10k premature fatalities per year in the capital.