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As Tuesday dawned residents of the world's most polluted city found themselves exposed to dangerously toxic air that registered in the "alarming" level.

Alarming Pollution Levels

Multiple areas of the city recorded an AQI exceeding 500, which equals ten times the healthy threshold set by the World Health Organization.

Certain monitoring stations, concentrations of dangerous airborne particles soared to of eighteen hundred, representing fifteen to twenty times above safe standards.

Firecracker Ban and Recent Changes

For the past four years, officials had maintained a complete ban on the distribution and bursting of firecrackers during Diwali due to their substantial impact to the hazardous pollution that engulfs the city as the cold season begins.

Yet recently, the current city administration petitioned the highest court to propose a modification of the restrictions.

They proposed allowing "environmentally conscious pyrotechnics" – historically questioned by environmental experts as being only approximately one-third lower impact – as a balance between "heritage and ecological concerns".

Legal Verdict and Enforcement

Despite concerns of public health and environmental activists, judicial authorities agreed to the proposal, mandating that eco-friendly pyrotechnics could be ignited during specific periods throughout the celebrations.

During the celebrations, there was extensive flouting of the designated hours across the metropolis, with little enforcement regarding whether the fireworks being used were actually the supposedly greener version.

Several recording stations throughout the capital recorded contamination peaking around the night hours to some of the worst levels seen during celebrations in at least three years.

Regional Consequences

Extensive ignition of fireworks during Diwali also triggered a dispute with adjacent Pakistan, with officials in Pakistan's Punjab province partly blaming worsening atmospheric conditions in their urban centers on hazardous particles coming from across the border following the festivities.

Chronic Environmental Issue

The dangerously high concentrations of pollution in Delhi have continued as a major problem for more than 15 years, with the problem gradually deteriorating.

Around celebratory seasons, the levels of toxic particulate matter in the environment has been documented to spike to significantly exceeding the peak records ever measured in the Chinese city, which was formerly considered as the globally most contaminated city.

Diverse Pollution Contributors

The problem in the city is attributed to a mix of multiple factors including transportation pollution, dust, development work, waste incineration and pollutants from agricultural fires in nearby states of neighboring agricultural zones.

Throughout these areas, rural residents regularly set their fields on fire to prepare for next season, generating toxic smog that remains stagnant over the capital as colder air sets in.

Medical and Economic Consequences

The economic and health impact on the roughly thirty-three million inhabitants living in the metropolitan zone is enormous, according to multiple investigations.

The contaminated air causes elevated rates of neurological, heart and circulatory and lung diseases, and can even lead to cancer.

Environmental contamination is calculated to be accounting for approximately 10k premature mortalities per year in the city.