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As Tuesday dawned residents of the world's most polluted city were faced with inhaling severely hazardous air that registered in the "alarming" range.

Record-Breaking Pollution Levels

Several parts of the city registered an pollution measurement exceeding 500, which translates to 10x the healthy threshold set by the World Health Organization.

Certain monitoring stations, readings of PM2.5 and PM10 hit highs of 1,800, representing fifteen to twenty times higher than safe levels.

Fireworks Ban and Current Policy Shifts

For the past four years, authorities had enforced a comprehensive restriction on the sale and use of firecrackers during Diwali due to their major role to the dangerous haze that blankets the metropolis as winter approaches.

However recently, the recently formed local administration appealed to the highest court to request a relaxation of the restrictions.

Officials advocated for allowing "eco-friendly fireworks" – historically doubted by conservation groups as being only about 30% lower impact – as a compromise between "heritage and ecological concerns".

Court Verdict and Reality

Much to the frustration of public health and environmental advocates, judicial authorities approved the appeal, mandating that eco-friendly pyrotechnics could be ignited during limited time windows throughout the Diwali.

Throughout the festival evening, there was widespread flouting of the regulated periods across the capital, with insufficient enforcement regarding whether the firecrackers being used were actually the supposedly greener type.

Numerous monitoring devices throughout Delhi registered contamination reaching highest levels around midnight to the most severe measurements observed during celebrations in at least three years.

International Implications

The widespread use of firecrackers during the festival also initiated a dispute with adjacent Pakistan, with authorities in Pakistani Punjab province partly blaming worsening air quality in the city of Lahore on pollutants originating in India following the festivities.

Long-Standing Pollution Problem

Alarmingly severe concentrations of pollution in the city have remained as a significant challenge for fifteen-plus years, with the situation showing no improvement.

Around celebratory seasons, the concentration of toxic particles in the air has been found to spike to 70% higher the peak readings ever documented in China's capital, which was once regarded as the world's most polluted metropolis.

Multiple Pollution Sources

This crisis in the capital is resulting from a convergence of various sources including heavy vehicle emissions, airborne particles, construction activities, rubbish burning and haze from crop residue ignition in neighbouring states of neighboring agricultural zones.

In these regions, agricultural workers illegally ignite agricultural waste to prepare for next season, generating hazardous pollution that becomes contained over the metropolitan area as colder air sets in.

Health and Financial Consequences

Public health and economic consequences on the roughly thirty-three million inhabitants residing in the capital region is significant, according to various research.

These hazardous conditions leads to high levels of neurological, cardiovascular and breathing conditions, and can potentially cause cancer.

The pollution is calculated to be responsible for approximately 10k untimely deaths annually in Delhi.