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Tuesday brought inhabitants of this heavily contaminated metropolis found themselves inhaling severely hazardous air that was classified as the "severe" category.

Extremely High Air Quality Levels

Various sections of the city registered an AQI exceeding 500, which translates to ten times the recommended threshold established by the World Health Organization.

Certain monitoring stations, levels of toxic particulate matter soared to of 1800, equating to 15-20x above healthy standards.

Pyrotechnics Restrictions and Current Policy Shifts

For the past four years, officials had implemented a complete ban on the sale and use of firecrackers during celebrations due to their substantial impact to the dangerous haze that engulfs the metropolis as winter approaches.

Nevertheless earlier this year, the recently formed local government appealed to the highest court to request a easing of the ban.

Officials advocated for allowing "green crackers" – which have been criticized by environmental experts as being only roughly 30 percent less polluting – as a balance between "heritage and ecological concerns".

Legal Verdict and Reality

To the disappointment of public health and environmental activists, the court complied with the appeal, specifying that green firecrackers could be set off during designated time windows throughout the festival.

On Monday night, there was considerable violation of the designated hours across the capital, with minimal regulation regarding whether the pyrotechnics being used were actually the supposedly greener variety.

Several monitoring devices throughout the capital showed pollution peaking around the night hours to some of the worst levels recorded during the festival in at least the past three years.

Cross-Border Consequences

Extensive ignition of pyrotechnics during the celebrations also sparked a controversy with neighbouring the neighboring country, with representatives in Pakistan's Punjab province pointing to deteriorating atmospheric conditions in Lahore on hazardous particles traveling from across the border following the events.

Persistent Environmental Crisis

Alarmingly severe levels of pollution in Delhi have persisted as a major issue for more than 15 years, with the condition showing no improvement.

During Diwali, the levels of toxic particulate matter in the atmosphere has been documented to increase dramatically to significantly exceeding the peak readings ever recorded in the Chinese city, which was previously considered as the planet's dirtiest urban center.

Multiple Contamination Factors

The situation in the capital is attributed to a mix of multiple factors including automobile exhaust, construction debris, building projects, waste incineration and haze from crop residue ignition in neighbouring areas of Punjab and Haryana.

In these regions, rural residents regularly burn crop residue to prepare for next season, generating hazardous pollution that remains stagnant over the city as winter air descends.

Health and Financial Toll

Public health and economic consequences on the approximately 33 million people residing in the Delhi area is substantial, according to multiple research.

This pollution causes increased incidence of neurological, heart and circulatory and lung conditions, and can even lead to malignancies.

Environmental contamination is estimated to be responsible for 10,000 untimely mortalities each year in Delhi.