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Tuesday brought residents of this heavily contaminated metropolis encountered breathing severely hazardous air that was classified as the "critical" category.

Alarming Air Quality Measurements

Various sections of the city showed an pollution measurement over 500, which represents a tenfold increase over the safe threshold established by the World Health Organization.

Particular areas, readings of toxic particulate matter soared to of eighteen hundred, equating to 15 to 20 times above healthy standards.

Pyrotechnics Restrictions and Recent Changes

Beginning in 2020, the government had maintained a complete ban on the distribution and bursting of firecrackers during Diwali due to their major role to the deadly pollution that engulfs the capital as winter approaches.

However in recent months, the newly elected city administration appealed to the supreme court to seek a relaxation of the ban.

The suggestion was allowing "green crackers" – which have been criticized by conservation groups as being only about 30% less polluting – as a middle ground between "heritage and public health".

Court Verdict and Reality

To the disappointment of public health and environmental activists, the court complied with the appeal, specifying that eco-friendly pyrotechnics could be ignited during limited time windows throughout the festival.

On Monday night, there was considerable disregard of the regulated periods across the capital, with little monitoring regarding whether the firecrackers being used were actually the eco-friendly type.

Many air quality sensors throughout the city registered contamination peaking around late evening to extremely hazardous readings seen during celebrations in at least three years.

Cross-Border Implications

The proliferation of fireworks during the celebrations also triggered a dispute with bordering the neighboring country, with officials in Pakistan's Punjab partly blaming deteriorating atmospheric conditions in Lahore on hazardous particles traveling from across the border following the events.

Chronic Environmental Issue

Alarmingly severe concentrations of air contamination in the capital have persisted as a significant challenge for over a decade and a half, with the situation gradually deteriorating.

Near the festival period, the levels of toxic particles in the atmosphere has been observed to shoot up to 70% higher the worst records ever measured in the Chinese city, which was formerly regarded as the planet's dirtiest metropolis.

Multiple Contamination Factors

The situation in the city is caused by a convergence of multiple factors including heavy vehicle emissions, construction debris, development work, garbage fires and pollutants from farm burning in adjacent states of Punjab and Haryana.

In these regions, rural residents regularly burn crop residue to clear them quickly, generating toxic haze that remains stagnant over the capital as colder air descends.

Public Health and Financial Impact

Both financial and medical impact on the approximately 33 million inhabitants residing in the capital region is substantial, according to numerous research.

The contaminated air results in increased incidence of nervous system, heart and circulatory and lung conditions, and can result in oncological diseases.

Environmental contamination is estimated to be causing approximately 10k early deaths per year in the capital.