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Tuesday brought residents of the planet's dirtiest urban center found themselves breathing extremely polluted air that was classified as the "critical" level.

Record-Breaking Air Quality Readings

Multiple areas of the city recorded an AQI exceeding 500, which equals 10x the healthy threshold set by the WHO.

Certain monitoring stations, concentrations of toxic particulate matter reached peaks of 1800, equating to 15-20x exceeding safe standards.

Pyrotechnics Ban and New Developments

Beginning in 2020, officials had implemented a comprehensive restriction on the distribution and bursting of firecrackers during the Festival of Lights due to their substantial impact to the dangerous haze that covers the metropolis as the cold season sets in.

Yet earlier this year, the newly elected regional administration appealed to the highest court to seek a easing of the prohibition.

The suggestion was allowing "environmentally conscious pyrotechnics" – previously criticized by environmental experts as being only about 30% less polluting – as a middle ground between "cultural practices and public health".

Judicial Decision and Reality

To the disappointment of environmental and health advocates, the court complied with the request, mandating that green firecrackers could be ignited during specific time windows throughout the celebrations.

During the celebrations, there was considerable flouting of the time restrictions across the capital, with insufficient enforcement regarding whether the firecrackers being used were actually the eco-friendly variety.

Several air quality sensors throughout Delhi recorded air quality spiking around midnight to extremely hazardous readings seen during celebrations in at least the past three years.

Cross-Border Implications

The proliferation of fireworks during the festival also sparked a blame game with bordering the neighboring country, with representatives in Pakistani Punjab partially attributing declining pollution levels in the city of Lahore on hazardous particles coming from neighboring India following the celebrations.

Long-Standing Pollution Issue

The dangerously high readings of air contamination in the city have remained as a serious issue for over a decade and a half, with the condition gradually deteriorating.

Near the festival period, the amount of toxic airborne contaminants in the air has been observed to shoot up to 70% higher the worst readings ever recorded in Beijing, which was formerly considered as the planet's dirtiest urban center.

Diverse Pollution Factors

The problem in Delhi is caused by a combination of various sources including heavy vehicle emissions, airborne particles, building projects, rubbish burning and smoke from farm burning in nearby regions of neighboring agricultural zones.

In these regions, rural residents regularly set their fields on fire to prepare for next season, creating toxic smog that remains stagnant over the city as cooler air descends.

Health and Economic Consequences

Public health and economic impact on the approximately 33 million people residing in the Delhi area is enormous, according to numerous studies.

The contaminated air causes elevated rates of neurological, heart and circulatory and respiratory diseases, and can result in malignancies.

Air quality crisis is projected to be accounting for ten thousand early fatalities annually in the city.