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As Tuesday dawned residents of the world's most polluted city were faced with breathing dangerously toxic air that fell into the "critical" category.

Alarming Air Quality Measurements

Several parts of Delhi recorded an pollution measurement exceeding 500, which translates to a tenfold increase over the healthy threshold recommended by the global health authority.

Certain monitoring stations, levels of toxic particulate matter soared to of 1800, representing fifteen to twenty times higher than healthy levels.

Pyrotechnics Prohibition and New Policy Shifts

For the past four years, authorities had enforced a total prohibition on the purchase and ignition of pyrotechnics during the Festival of Lights due to their substantial impact to the dangerous haze that blankets the capital as the cold season begins.

Nevertheless in recent months, the newly elected regional administration petitioned the supreme court to request a easing of the prohibition.

Officials advocated for allowing "eco-friendly fireworks" – previously doubted by environmentalists as being only about 30% less polluting – as a compromise between "tradition and ecological concerns".

Court Verdict and Reality

To the disappointment of environmental and health campaigners, the court complied with the request, stipulating that green firecrackers could be ignited during designated time windows throughout the Diwali.

On Monday night, there was extensive disregard of the regulated periods across the capital, with insufficient enforcement regarding whether the pyrotechnics being used were actually the eco-friendly type.

Many recording stations throughout the capital showed air quality reaching highest levels around late evening 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 initiated a dispute with adjacent the neighboring country, with authorities in Pakistani Punjab province pointing to deteriorating pollution levels in Lahore on hazardous particles traveling from India following the festivities.

Long-Standing Environmental Issue

Alarmingly severe levels of pollution in the capital have remained as a serious challenge for over a decade and a half, with the condition continuing to worsen.

Near Diwali, the amount of hazardous particles in the atmosphere has been observed to increase dramatically to seventy percent above the peak readings ever documented in the Chinese city, which was previously viewed as the world's most polluted metropolis.

Diverse Pollution Factors

This crisis in Delhi is attributed to a convergence of various sources including transportation pollution, construction debris, building projects, waste incineration and haze from agricultural fires in nearby areas of neighboring agricultural zones.

Within these states, agricultural workers routinely burn crop residue to expedite field preparation, creating hazardous smog that remains stagnant over the metropolitan area as cooler air arrives.

Health and Economic Toll

Public health and economic consequences on the approximately 33 million residents living in the metropolitan zone is enormous, according to numerous investigations.

This pollution causes elevated rates of neurological, heart and circulatory and respiratory conditions, and can potentially cause cancer.

Air quality crisis is estimated to be causing 10,000 premature deaths annually in the city.