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As Tuesday dawned inhabitants of the planet's dirtiest urban center found themselves inhaling dangerously toxic air that registered in the "alarming" range.

Alarming Pollution Readings

Multiple areas of the city showed an air quality index exceeding 500, which translates to 10x the recommended limit set by the World Health Organization.

Certain monitoring stations, levels of dangerous airborne particles reached peaks of 1,800, representing 15-20x exceeding acceptable levels.

Firecracker Ban and Recent Policy Shifts

Beginning in 2020, officials had implemented a total prohibition on the sale and use of fireworks during celebrations due to their major role to the deadly haze that covers the city as colder weather begins.

Yet recently, the newly elected local government approached the highest court to seek a easing of the ban.

Officials advocated for allowing "eco-friendly fireworks" – which have been questioned by environmentalists as being only approximately one-third reduced emissions – as a balance between "cultural practices and public health".

Legal Decision and Implementation

To the disappointment of environmental and health campaigners, judges approved the request, specifying that environmentally conscious fireworks could be set off during limited time windows throughout the Diwali.

During the celebrations, there was widespread flouting of the time restrictions across the metropolis, with little monitoring regarding whether the fireworks being used were actually the supposedly greener variety.

Several recording stations throughout the capital recorded air quality peaking around midnight to some of the worst levels seen during celebrations in at least recent memory.

Regional Implications

The proliferation of firecrackers during Diwali also initiated a blame game with adjacent Pakistan, with officials in Pakistani Punjab province partly blaming worsening air quality in their urban centers on contaminants traveling from neighboring India following the events.

Chronic Pollution Problem

Extremely elevated levels of air contamination in Delhi have remained as a major problem for more than 15 years, with the situation continuing to worsen.

Around the festival period, the concentration of toxic particulate matter in the atmosphere has been observed to spike to significantly exceeding the most severe readings ever measured in China's capital, which was once regarded as the world's most polluted city.

Diverse Pollution Contributors

The situation in Delhi is resulting from a convergence of different contributors including heavy vehicle emissions, airborne particles, development work, garbage fires and smoke from farm burning in neighbouring regions of Punjab and Haryana.

Within these states, rural residents illegally ignite agricultural waste to prepare for next season, generating hazardous smog that remains stagnant over the city as cooler air descends.

Health and Economic Impact

The economic and health toll on the approximately 33 million people living in the capital region is substantial, according to various studies.

This pollution leads to high levels of nervous system, heart and circulatory and respiratory disorders, and can result in cancer.

The pollution is estimated to be accounting for approximately 10k early fatalities each year in Delhi.