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Tuesday brought residents of the world's most polluted city were faced with breathing dangerously toxic air that registered in the "critical" category.

Extremely High Pollution Levels

Various sections of the city showed an AQI above 500, which represents a tenfold increase over the safe threshold recommended by the World Health Organization.

Certain monitoring stations, readings of PM2.5 and PM10 reached peaks of 1,800, equating to fifteen to twenty times above acceptable limits.

Firecracker Ban and New Developments

Since 2020, the government had implemented a total prohibition on the sale and use of firecrackers during Diwali due to their significant contribution to the dangerous smog that blankets the capital as winter approaches.

Yet in recent months, the current regional government approached the supreme court to propose a relaxation of the ban.

They proposed allowing "environmentally conscious pyrotechnics" – which have been criticized by environmental experts as being only about 30% reduced emissions – as a compromise between "tradition and public health".

Legal Decision and Enforcement

To the disappointment of public health and environmental activists, judges complied with the request, specifying that environmentally conscious fireworks could be set off during designated periods throughout the Diwali.

Throughout the festival evening, there was extensive flouting of the time restrictions across the metropolis, with little regulation regarding whether the fireworks being used were actually the more environmentally friendly variety.

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

Cross-Border Effects

Extensive ignition of firecrackers during the celebrations also initiated a blame game with adjacent the neighboring country, with authorities in Pakistan's Punjab partially attributing worsening air quality in the city of Lahore on pollutants traveling from India following the events.

Long-Standing Pollution Issue

The dangerously high concentrations of pollution in the capital have persisted as a serious challenge for more than 15 years, with the problem continuing to worsen.

During the festival period, the levels of toxic particles in the environment has been documented to spike to 70% higher the worst levels ever recorded in China's capital, which was once viewed as the globally most contaminated metropolis.

Various Contamination Sources

The problem in the city is resulting from a combination of various sources including heavy vehicle emissions, airborne particles, construction activities, garbage fires and haze from agricultural fires in adjacent regions of Punjab and Haryana.

Throughout these areas, farmers illegally burn crop residue to prepare for next season, producing dangerous haze that then gets trapped over the capital as colder air descends.

Medical and Financial Consequences

Both financial and medical toll on the roughly thirty-three million inhabitants living in the Delhi area is substantial, according to multiple investigations.

The contaminated air results in increased incidence of neurological, heart and circulatory and respiratory disorders, and can result in oncological diseases.

The pollution is projected to be responsible for ten thousand untimely mortalities annually in Delhi.