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Tuesday brought inhabitants of this heavily contaminated metropolis encountered breathing severely hazardous air that was classified as the "alarming" level.

Record-Breaking Air Quality Measurements

Multiple areas of Delhi recorded an pollution measurement exceeding 500, which translates to a tenfold increase over the safe limit set by the WHO.

Particular areas, levels of toxic particulate matter soared to of 1800, equating to 15 to 20 times exceeding healthy standards.

Firecracker Prohibition and Current Changes

For the past four years, officials had enforced a total prohibition on the distribution and bursting of fireworks during the Festival of Lights due to their substantial impact to the deadly pollution that covers the city as the cold season sets in.

Nevertheless in recent months, the current regional government appealed to the supreme court to request a easing of the restrictions.

The suggestion was allowing "eco-friendly fireworks" – which have been questioned by conservation groups as being only roughly 30 percent lower impact – as a balance between "heritage and public health".

Judicial Decision and Reality

To the disappointment of public health and environmental campaigners, judicial authorities agreed to the request, stipulating that environmentally conscious fireworks could be used during designated hours throughout the Diwali.

Throughout the festival evening, there was extensive flouting of the regulated periods across the capital, with little enforcement regarding whether the fireworks being used were actually the more environmentally friendly type.

Several air quality sensors throughout the city recorded pollution spiking around late evening to the most severe measurements seen during the festival in at least three years.

Regional Implications

The proliferation of fireworks during the festival also triggered a controversy with adjacent Pakistan, with authorities in Pakistani Punjab partially attributing deteriorating pollution levels in their urban centers on hazardous particles coming from India following the festivities.

Chronic Pollution Issue

Extremely elevated levels of pollution in the capital have continued as a significant problem for fifteen-plus years, with the situation gradually deteriorating.

During Diwali, the concentration of hazardous particulate matter in the environment has been documented to spike to 70% higher the most severe records ever documented in Beijing, which was formerly regarded as the planet's dirtiest city.

Diverse Pollution Sources

This crisis in Delhi is caused by a convergence of multiple factors including heavy vehicle emissions, airborne particles, building projects, garbage fires and smoke from agricultural fires in nearby states of Punjab and Haryana.

Throughout these areas, rural residents regularly burn crop residue to expedite field preparation, creating hazardous pollution that then gets trapped over the city as cooler air descends.

Medical and Financial Toll

Public health and economic toll on the nearly 33 million inhabitants calling home the capital region is substantial, according to multiple research.

The contaminated air results in high levels of nervous system, heart and circulatory and respiratory conditions, and can result in oncological diseases.

The pollution is projected to be responsible for approximately 10k premature deaths annually in Delhi.