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Tuesday brought citizens of the world's most polluted city found themselves exposed to dangerously toxic air that fell into the "alarming" category.

Extremely High Air Quality Measurements

Several parts of Delhi showed an AQI over 500, which equals 10x the safe threshold recommended by the World Health Organization.

Particular areas, concentrations of PM2.5 and PM10 soared to of 1,800, amounting to 15 to 20 times above acceptable standards.

Fireworks Prohibition and Recent Changes

Since 2020, authorities had maintained a complete ban on the sale and use of firecrackers during Diwali due to their significant contribution to the dangerous pollution that engulfs the metropolis as winter sets in.

However recently, the current local administration approached the judicial authority to seek a modification of the ban.

Officials advocated for allowing "environmentally conscious pyrotechnics" – which have been criticized by environmentalists as being only about 30% reduced emissions – as a middle ground between "tradition and public health".

Legal Verdict and Enforcement

Despite concerns of medical and ecological advocates, the court agreed to the request, specifying that environmentally conscious fireworks could be used during limited time windows throughout the celebrations.

Throughout the festival evening, there was extensive flouting of the regulated periods across the city, with insufficient monitoring regarding whether the fireworks being used were actually the eco-friendly version.

Numerous air quality sensors throughout the capital showed pollution spiking around midnight to extremely hazardous levels observed during Diwali in at least three years.

Cross-Border Effects

Extensive ignition of firecrackers during Diwali also initiated a blame game with bordering Pakistan, with representatives in Pakistan's Punjab province partly blaming deteriorating air quality in the city of Lahore on pollutants traveling from India following the celebrations.

Long-Standing Pollution Crisis

The dangerously high concentrations of pollution in the capital have continued as a serious challenge for more than 15 years, with the situation showing no improvement.

Around the festival period, the levels of dangerous particles in the environment has been documented to spike to 70% higher the worst readings ever recorded in Beijing, which was once regarded as the globally most contaminated city.

Diverse Pollution Sources

This crisis in Delhi is resulting from a convergence of multiple factors including heavy vehicle emissions, construction debris, building projects, rubbish burning and smoke from crop residue ignition in adjacent regions of neighboring agricultural zones.

Within these states, rural residents regularly burn crop residue to clear them quickly, creating dangerous smog that becomes contained over the capital as cooler air descends.

Medical and Financial Toll

Public health and economic toll on the nearly 33 million people residing in the metropolitan zone is enormous, according to multiple research.

The contaminated air results in elevated rates of neurological, cardiovascular and respiratory disorders, and can result in oncological diseases.

Air quality crisis is calculated to be accounting for ten thousand premature deaths annually in the city.