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On Tuesday morning residents of this heavily contaminated metropolis were faced with exposed to dangerously toxic air that fell into the "alarming" category.

Record-Breaking Air Quality Measurements

Various sections of the city recorded an pollution measurement above 500, which translates to 10x the safe limit set by the global health authority.

Particular areas, concentrations of dangerous airborne particles hit highs of 1800, representing 15-20x higher than acceptable levels.

Firecracker Restrictions and Recent Policy Shifts

For the past four years, the government had maintained a comprehensive restriction on the distribution and bursting of pyrotechnics during the Festival of Lights due to their major role to the dangerous pollution that covers the capital as winter approaches.

However earlier this year, the newly elected city government petitioned the highest court to propose a relaxation of the prohibition.

The suggestion was allowing "eco-friendly fireworks" – which have been doubted by environmentalists as being only about 30% lower impact – as a compromise between "tradition and environment".

Legal Verdict and Enforcement

To the disappointment of public health and environmental advocates, judicial authorities complied with the appeal, specifying that environmentally conscious fireworks could be used during designated periods throughout the Diwali.

On Monday night, there was widespread violation of the designated hours across the capital, with minimal enforcement regarding whether the pyrotechnics being used were actually the supposedly greener version.

Numerous monitoring devices throughout the city showed contamination peaking around the night hours to extremely hazardous measurements seen during celebrations in at least the past three years.

Cross-Border Effects

Extensive ignition of firecrackers during the celebrations also triggered a controversy with neighbouring the neighboring country, with officials in Pakistani the Punjab region partly blaming deteriorating air quality in Lahore on contaminants coming from across the border following the events.

Chronic Environmental Problem

Extremely elevated readings of atmospheric toxins in the city have persisted as a serious challenge for over a decade and a half, with the condition showing no improvement.

Around the festival period, the concentration of toxic particulate matter in the atmosphere has been found to spike to seventy percent above the peak readings ever measured in China's capital, which was previously considered as the globally most contaminated metropolis.

Diverse Pollution Factors

The situation in Delhi is resulting from a mix of multiple factors including transportation pollution, construction debris, construction activities, waste incineration and smoke from farm burning in neighbouring regions of farming communities.

In these regions, rural residents regularly ignite agricultural waste to clear them quickly, creating hazardous smog that then gets trapped over the metropolitan area as winter air arrives.

Health and Financial Consequences

Both financial and medical toll on the approximately 33 million inhabitants residing in the metropolitan zone is substantial, according to numerous research.

These hazardous conditions leads to high levels of nervous system, heart and circulatory and lung disorders, and can potentially cause cancer.

Environmental contamination is projected to be responsible for ten thousand premature mortalities per year in Delhi.