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Tuesday brought residents of the world's most polluted city were faced with exposed to dangerously toxic air that registered in the "critical" category.

Extremely High Pollution Measurements

Several parts of Delhi recorded an pollution measurement above 500, which equals a tenfold increase over the healthy threshold set by the World Health Organization.

Certain monitoring stations, readings of dangerous airborne particles reached peaks of 1,800, amounting to fifteen to twenty times higher than safe levels.

Fireworks Prohibition and Current Changes

For the past four years, the government had implemented a total prohibition on the distribution and bursting of pyrotechnics during celebrations due to their significant contribution to the deadly smog that blankets the capital as colder weather begins.

Yet recently, the newly elected regional leadership appealed to the supreme court to request a modification of the ban.

Officials advocated for allowing "eco-friendly fireworks" – which have been criticized by conservation groups as being only roughly 30 percent lower impact – as a middle ground between "tradition and ecological concerns".

Legal Ruling and Reality

To the disappointment of environmental and health activists, the court complied with the appeal, mandating that environmentally conscious fireworks could be ignited during limited periods throughout the festival.

Throughout the festival evening, there was extensive disregard of the designated hours across the metropolis, with minimal enforcement regarding whether the firecrackers being used were actually the more environmentally friendly type.

Several air quality sensors throughout Delhi registered air quality spiking around the night hours to some of the worst readings observed during Diwali in at least the past three years.

Cross-Border Implications

The proliferation of firecrackers during Diwali also sparked a dispute with adjacent Pakistan, with officials in Pakistan's Punjab partly blaming deteriorating air quality in the city of Lahore on contaminants traveling from neighboring India following the events.

Persistent Pollution Problem

The dangerously high concentrations of air contamination in the city have persisted as a major problem for over a decade and a half, with the problem showing no improvement.

During the festival period, the levels of dangerous particulate matter in the air has been observed to increase dramatically to seventy percent above the most severe readings ever measured in Beijing, which was formerly regarded as the world's most polluted metropolis.

Diverse Contamination Contributors

This crisis in the capital is resulting from a convergence of multiple factors including transportation pollution, airborne particles, construction activities, garbage fires and haze from farm burning in nearby states of Punjab and Haryana.

Within these states, farmers illegally set their fields on fire to expedite field preparation, producing dangerous haze that becomes contained over the city as cooler air sets in.

Public Health and Economic Impact

Public health and economic impact on the nearly 33 million people living in the capital region is substantial, according to various investigations.

This pollution results in high levels of neurological, cardiovascular and respiratory conditions, and can result in malignancies.

Environmental contamination is projected to be causing 10,000 early deaths each year in the capital.