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Tuesday brought residents of the planet's dirtiest urban center found themselves inhaling dangerously toxic air that fell into the "critical" level.

Record-Breaking Pollution Measurements

Various sections of the city recorded an air quality index over 500, which translates to a tenfold increase over the healthy threshold recommended by the World Health Organization.

Certain monitoring stations, concentrations of PM2.5 and PM10 hit highs of 1,800, equating to 15 to 20 times exceeding safe levels.

Fireworks Prohibition and Recent Developments

Since 2020, authorities had enforced a complete ban on the sale and use of fireworks during Diwali due to their substantial impact to the deadly pollution that blankets the metropolis as colder weather approaches.

Nevertheless earlier this year, the current local administration petitioned the judicial authority to propose a relaxation of the restrictions.

The suggestion was allowing "green crackers" – which have been criticized by environmentalists as being only approximately one-third less polluting – as a balance between "tradition and public health".

Judicial Ruling and Enforcement

Much to the frustration of public health and environmental advocates, judicial authorities approved the request, mandating that eco-friendly pyrotechnics could be used during limited time windows throughout the Diwali.

On Monday night, there was widespread disregard of the designated hours across the city, with insufficient enforcement regarding whether the pyrotechnics being used were actually the eco-friendly type.

Several air quality sensors throughout the city recorded air quality peaking around midnight to the most severe readings seen during celebrations in at least three years.

International Consequences

The widespread use of fireworks during the festival also sparked a controversy with bordering Pakistan, with authorities in Pakistan's Punjab province partly blaming deteriorating air quality in their urban centers on hazardous particles originating in across the border following the events.

Chronic Pollution Issue

Extremely elevated readings of pollution in the capital have remained as a serious problem for fifteen-plus years, with the situation gradually deteriorating.

Around celebratory seasons, the levels of hazardous airborne contaminants in the atmosphere has been found to shoot up to significantly exceeding the peak readings ever documented in China's capital, which was formerly viewed as the globally most contaminated urban center.

Diverse Pollution Factors

The situation in the capital is caused by a convergence of different contributors including heavy vehicle emissions, dust, development work, garbage fires and smoke from farm burning in neighbouring areas of Punjab and Haryana.

Throughout these areas, agricultural workers regularly set their fields on fire to clear them quickly, creating toxic pollution that then gets trapped over the metropolitan area as colder air arrives.

Public Health and Economic Toll

The economic and health toll on the nearly 33 million inhabitants calling home the metropolitan zone is enormous, according to numerous investigations.

The contaminated air leads to high levels of neurological, heart and circulatory and respiratory diseases, and can potentially cause malignancies.

The pollution is projected to be responsible for ten thousand untimely fatalities annually in the city.