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Tuesday brought inhabitants of the world's most polluted city encountered exposed to extremely polluted air that fell into the "critical" level.

Alarming Air Quality Levels

Several parts of Delhi recorded an AQI over 500, which represents a tenfold increase over the recommended level set by the WHO.

Particular areas, readings of PM2.5 and PM10 soared to of eighteen hundred, representing fifteen to twenty times higher than healthy limits.

Firecracker Ban and New Policy Shifts

For the past four years, the government had maintained a total prohibition on the distribution and bursting of pyrotechnics during Diwali due to their substantial impact to the hazardous pollution that covers the metropolis as the cold season begins.

Nevertheless recently, the current city administration appealed to the judicial authority to seek a easing of the ban.

The suggestion was allowing "eco-friendly fireworks" – previously doubted by conservation groups as being only approximately one-third reduced emissions – as a middle ground between "cultural practices and environment".

Court Verdict and Reality

Despite concerns of public health and environmental activists, judges agreed to the appeal, stipulating that eco-friendly pyrotechnics could be used during limited time windows throughout the festival.

Throughout the festival evening, there was extensive violation of the time restrictions across the city, with little enforcement regarding whether the pyrotechnics being used were actually the more environmentally friendly version.

Numerous monitoring devices throughout the city showed contamination reaching highest levels around midnight to the most severe levels seen during celebrations in at least recent memory.

International Consequences

The proliferation of fireworks during the festival also sparked a dispute with adjacent the neighboring country, with representatives in Pakistan's Punjab pointing to declining pollution levels in Lahore on contaminants coming from neighboring India following the festivities.

Persistent Pollution Issue

Extremely elevated levels of air contamination in the capital have continued as a major challenge for fifteen-plus years, with the problem continuing to worsen.

Near the festival period, the levels of dangerous particles in the atmosphere has been found to shoot up to 70% higher the most severe levels ever documented in the Chinese city, which was previously considered as the globally most contaminated city.

Multiple Pollution Sources

This crisis in the city is caused by a combination of multiple factors including transportation pollution, dust, building projects, garbage fires and haze from agricultural fires in neighbouring areas of farming communities.

Throughout these areas, rural residents regularly burn crop residue to expedite field preparation, producing dangerous pollution that then gets trapped over the capital as cooler air arrives.

Public Health and Economic Consequences

Both financial and medical toll on the approximately 33 million residents living in the metropolitan zone is significant, according to multiple studies.

This pollution results in increased incidence of nervous system, heart and circulatory and respiratory conditions, and can potentially cause malignancies.

Environmental contamination is projected to be accounting for ten thousand premature deaths per year in the city.