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Tuesday brought inhabitants of this heavily contaminated metropolis found themselves exposed to extremely polluted air that was classified as the "critical" level.

Record-Breaking Pollution Measurements

Various sections of the capital registered an pollution measurement over 500, which translates to 10x the healthy limit established by the World Health Organization.

In some locations, concentrations of dangerous airborne particles soared to of 1800, representing 15 to 20 times above safe limits.

Firecracker Prohibition and Recent Policy Shifts

For the past four years, the government had maintained a total prohibition on the sale and use of fireworks during the Festival of Lights due to their major role to the deadly pollution that blankets the metropolis as colder weather begins.

Nevertheless earlier this year, the recently formed city leadership appealed to the highest court to request a relaxation of the restrictions.

They proposed allowing "eco-friendly fireworks" – previously criticized by conservation groups as being only approximately one-third lower impact – as a compromise between "cultural practices and ecological concerns".

Court Decision and Enforcement

Despite concerns of medical and ecological campaigners, the court complied with the request, mandating that eco-friendly pyrotechnics could be ignited during specific hours throughout the festival.

On Monday night, there was considerable disregard of the time restrictions across the capital, with little monitoring regarding whether the firecrackers being used were actually the eco-friendly variety.

Several recording stations throughout Delhi recorded air quality reaching highest levels around the night hours to some of the worst readings observed during celebrations in at least recent memory.

Regional Implications

Extensive ignition of pyrotechnics during Diwali also initiated a controversy with neighbouring Pakistan, with officials in Pakistan's the Punjab region partially attributing deteriorating atmospheric conditions in their urban centers on contaminants traveling from across the border following the celebrations.

Persistent Environmental Problem

Extremely elevated concentrations of pollution in the capital have continued as a serious issue for fifteen-plus years, with the situation gradually deteriorating.

During Diwali, the amount of hazardous particles in the environment has been found to shoot up to 70% higher the most severe readings ever recorded in China's capital, which was once viewed as the planet's dirtiest metropolis.

Various Pollution Sources

The situation in Delhi is resulting from a combination of different contributors including heavy vehicle emissions, dust, construction activities, rubbish burning and smoke from farm burning in nearby regions of neighboring agricultural zones.

Within these states, farmers routinely set their fields on fire to prepare for next season, creating toxic pollution that becomes contained over the capital as cooler air sets in.

Health and Financial Impact

The economic and health impact on the roughly thirty-three million residents living in the capital region is substantial, according to numerous research.

This pollution results in high levels of neurological, heart and circulatory and breathing diseases, and can result in malignancies.

Environmental contamination is calculated to be causing 10,000 untimely mortalities per year in the capital.