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Tuesday brought residents of this heavily contaminated metropolis encountered breathing severely hazardous air that fell into the "alarming" category.

Extremely High Pollution Measurements

Several parts of Delhi showed an AQI above 500, which equals ten times the recommended limit established by the global health authority.

Particular areas, concentrations of toxic particulate matter hit highs of eighteen hundred, equating to 15 to 20 times exceeding safe levels.

Pyrotechnics Ban and New Policy Shifts

Since 2020, authorities had maintained a comprehensive restriction on the sale and use of pyrotechnics during the Festival of Lights due to their significant contribution to the deadly pollution that covers the capital as the cold season begins.

However in recent months, the current local leadership appealed to the highest court to seek a easing of the ban.

Officials advocated for allowing "environmentally conscious pyrotechnics" – historically doubted by environmentalists as being only approximately one-third reduced emissions – as a balance between "heritage and ecological concerns".

Judicial Decision and Enforcement

To the disappointment of medical and ecological advocates, judges agreed to the appeal, specifying that green firecrackers could be ignited during limited time windows throughout the festival.

On Monday night, there was widespread disregard of the regulated periods across the metropolis, with insufficient regulation regarding whether the fireworks being used were actually the more environmentally friendly type.

Numerous air quality sensors throughout the capital registered air quality spiking around late evening to extremely hazardous levels seen during celebrations in at least the past three years.

Cross-Border Implications

Extensive ignition of pyrotechnics during the celebrations also initiated a dispute with adjacent the neighboring country, with authorities in Pakistani Punjab province pointing to worsening pollution levels in Lahore on contaminants originating in across the border following the festivities.

Chronic Environmental Problem

Extremely elevated concentrations of pollution in the capital have continued as a serious challenge for over a decade and a half, with the situation showing no improvement.

During the festival period, the amount of hazardous particulate matter in the atmosphere has been observed to shoot up to significantly exceeding the peak records ever measured in China's capital, which was formerly considered as the globally most contaminated city.

Various Pollution Factors

The situation in the capital is caused by a combination of multiple factors including transportation pollution, dust, development work, rubbish burning and haze from agricultural fires in nearby states of neighboring agricultural zones.

Within these states, rural residents regularly set their fields on fire to expedite field preparation, generating dangerous haze that then gets trapped over the metropolitan area as colder air arrives.

Public Health and Economic Consequences

Both financial and medical impact on the approximately 33 million residents residing in the metropolitan zone is significant, according to numerous research.

These hazardous conditions leads to high levels of nervous system, cardiovascular and breathing diseases, and can potentially cause malignancies.

The pollution is projected to be causing approximately 10k premature mortalities per year in the city.