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As Tuesday dawned residents of the world's most polluted city were faced with exposed to severely hazardous air that registered in the "alarming" category.

Alarming Pollution Measurements

Several parts of Delhi showed an pollution measurement exceeding 500, which represents a tenfold increase over the recommended threshold set by the World Health Organization.

Particular areas, levels of toxic particulate matter reached peaks of 1,800, representing 15 to 20 times above healthy levels.

Firecracker Ban and Current Changes

Since 2020, the government had maintained a complete ban on the sale and use of firecrackers during celebrations due to their substantial impact to the hazardous haze that covers the capital as colder weather approaches.

Yet earlier this year, the recently formed regional government appealed to the highest court to propose a modification of the prohibition.

The suggestion was allowing "environmentally conscious pyrotechnics" – which have been questioned by environmental experts as being only roughly 30 percent lower impact – as a middle ground between "tradition and public health".

Court Ruling and Implementation

To the disappointment of medical and ecological advocates, judges complied with the request, specifying that environmentally conscious fireworks could be ignited during specific periods throughout the celebrations.

During the celebrations, there was widespread disregard of the designated hours across the metropolis, with insufficient monitoring regarding whether the pyrotechnics being used were actually the supposedly greener variety.

Many air quality sensors throughout Delhi registered contamination spiking around midnight to the most severe readings recorded during the festival in at least recent memory.

Regional Implications

Extensive ignition of pyrotechnics during Diwali also triggered a blame game with neighbouring Pakistan, with representatives in Pakistani Punjab partially attributing deteriorating air quality in the city of Lahore on hazardous particles traveling from across the border following the celebrations.

Persistent Pollution Issue

Extremely elevated concentrations of atmospheric toxins in the city have continued as a significant challenge for more than 15 years, with the condition showing no improvement.

Near celebratory seasons, the concentration of toxic particulate matter in the air has been observed to shoot up to 70% higher the peak levels ever measured in the Chinese city, which was formerly regarded as the globally most contaminated metropolis.

Various Contamination Sources

The situation in the capital is attributed to a combination of various sources including heavy vehicle emissions, dust, construction activities, rubbish burning and pollutants from farm burning in adjacent areas of neighboring agricultural zones.

Throughout these areas, farmers regularly burn crop residue to clear them quickly, producing toxic pollution that then gets trapped over the capital as winter air arrives.

Medical and Economic Consequences

The economic and health impact on the approximately 33 million residents calling home the capital region is significant, according to multiple investigations.

These hazardous conditions causes increased incidence of neurological, cardiovascular and lung diseases, and can even lead to malignancies.

Environmental contamination is projected to be responsible for approximately 10k early mortalities per year in the capital.