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On Tuesday morning residents of the world's most polluted city found themselves breathing dangerously toxic air that registered in the "severe" category.

Extremely High Air Quality Measurements

Several parts of the city showed an pollution measurement above 500, which represents 10x the healthy threshold established by the World Health Organization.

Particular areas, concentrations of toxic particulate matter reached peaks of eighteen hundred, equating to 15 to 20 times higher than safe standards.

Firecracker Prohibition and Recent Policy Shifts

Since 2020, authorities had implemented a complete ban on the distribution and bursting of fireworks during Diwali due to their major role to the hazardous haze that covers the metropolis as colder weather begins.

Yet earlier this year, the newly elected regional government petitioned the judicial authority to seek a modification of the restrictions.

The suggestion was allowing "green crackers" – previously questioned by environmental experts as being only about 30% lower impact – as a middle ground between "cultural practices and environment".

Legal Decision and Reality

Much to the frustration of environmental and health advocates, the court approved the request, stipulating that eco-friendly pyrotechnics could be used during specific hours throughout the celebrations.

During the celebrations, there was widespread flouting of the regulated periods across the metropolis, with little regulation regarding whether the fireworks being used were actually the more environmentally friendly variety.

Many air quality sensors throughout the city showed air quality spiking around the night hours to the most severe levels seen during celebrations in at least the past three years.

Cross-Border Consequences

Extensive ignition of fireworks during the celebrations also triggered a blame game with adjacent Pakistan, with representatives in Pakistani Punjab province pointing to declining atmospheric conditions in the city of Lahore on pollutants traveling from India following the events.

Chronic Pollution Crisis

The dangerously high concentrations of pollution in Delhi have remained as a serious problem for fifteen-plus years, with the condition showing no improvement.

During the festival period, the amount of toxic particulate matter in the environment has been found to shoot up to seventy percent above the most severe levels ever measured in China's capital, which was previously considered as the planet's dirtiest city.

Multiple Contamination Sources

This crisis in the capital is caused by a mix of various sources including automobile exhaust, construction debris, construction activities, waste incineration and smoke from crop residue ignition in nearby regions of Punjab and Haryana.

In these regions, farmers regularly ignite agricultural waste to prepare for next season, generating toxic haze that then gets trapped over the metropolitan area as cooler air sets in.

Health and Economic Impact

The economic and health impact on the roughly thirty-three million residents calling home the Delhi area is enormous, according to various research.

This pollution results in elevated rates of neurological, heart and circulatory and lung disorders, and can result in cancer.

Environmental contamination is estimated to be responsible for 10,000 premature fatalities per year in the city.