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As Tuesday dawned citizens of this heavily contaminated metropolis encountered breathing dangerously toxic air that registered in the "alarming" category.

Alarming Air Quality Readings

Multiple areas of the city registered an air quality index exceeding 500, which equals 10x the safe limit set by the World Health Organization.

Particular areas, readings of PM2.5 and PM10 hit highs of 1,800, representing 15-20x above safe limits.

Pyrotechnics Prohibition and Recent Policy Shifts

For the past four years, officials had maintained a total prohibition on the sale and use of fireworks during the Festival of Lights due to their major role to the hazardous smog that blankets the city as winter sets in.

Nevertheless recently, the recently formed regional government appealed to the supreme court to request a relaxation of the prohibition.

The suggestion was allowing "environmentally conscious pyrotechnics" – historically questioned by environmental experts as being only about 30% less polluting – as a middle ground between "cultural practices and ecological concerns".

Legal Ruling and Implementation

Despite concerns of medical and ecological activists, the court complied with the request, stipulating that green firecrackers could be used during specific periods throughout the festival.

Throughout the festival evening, there was extensive disregard of the designated hours across the city, with little monitoring regarding whether the fireworks being used were actually the supposedly greener type.

Several monitoring devices throughout the city showed contamination spiking around late evening to extremely hazardous measurements observed during celebrations in at least recent memory.

Regional Implications

Extensive ignition of fireworks during the festival also sparked a controversy with neighbouring Pakistan, with officials in Pakistan's the Punjab region partly blaming worsening air quality in the city of Lahore on contaminants traveling from India following the celebrations.

Chronic Environmental Issue

Extremely elevated readings of air contamination in the city have persisted as a significant issue for fifteen-plus years, with the problem gradually deteriorating.

During celebratory seasons, the amount of toxic airborne contaminants in the environment has been documented to spike to seventy percent above the most severe records ever measured in the Chinese city, which was formerly regarded as the world's most polluted metropolis.

Various Pollution Factors

The situation in Delhi is resulting from a convergence of different contributors including heavy vehicle emissions, airborne particles, development work, waste incineration and smoke from agricultural fires in nearby states of neighboring agricultural zones.

Within these states, rural residents illegally ignite agricultural waste to prepare for next season, producing dangerous pollution that remains stagnant over the city as winter air arrives.

Health and Financial Toll

The economic and health consequences on the nearly 33 million inhabitants residing in the metropolitan zone is substantial, according to multiple research.

The contaminated air leads to elevated rates of nervous system, cardiovascular and respiratory disorders, and can result in oncological diseases.

Air quality crisis is projected to be accounting for 10,000 premature deaths per year in Delhi.