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Tuesday brought citizens of the planet's dirtiest urban center found themselves breathing extremely polluted air that registered in the "alarming" range.

Alarming Air Quality Measurements

Several parts of Delhi showed an pollution measurement above 500, which represents ten times the healthy threshold established by the WHO.

Particular areas, readings of PM2.5 and PM10 hit highs of 1800, representing 15 to 20 times higher than healthy levels.

Fireworks Ban and Recent Policy Shifts

For the past four years, the government had implemented a comprehensive restriction on the purchase and ignition of firecrackers during the Festival of Lights due to their substantial impact to the deadly smog that covers the metropolis as colder weather sets in.

Yet earlier this year, the current city leadership appealed to the supreme court to seek a easing of the prohibition.

The suggestion was allowing "green crackers" – which have been criticized by environmental experts as being only approximately one-third lower impact – as a balance between "heritage and environment".

Court Verdict and Enforcement

To the disappointment of environmental and health advocates, judicial authorities agreed to the proposal, mandating that green firecrackers could be ignited during designated time windows throughout the celebrations.

On Monday night, there was considerable disregard of the regulated periods across the city, with minimal enforcement regarding whether the fireworks being used were actually the supposedly greener type.

Many recording stations throughout the capital registered air quality reaching highest levels around the night hours to the most severe readings seen during the festival in at least the past three years.

Cross-Border Effects

The proliferation of firecrackers during the celebrations also sparked a dispute with adjacent the neighboring country, with officials in Pakistani Punjab pointing to deteriorating pollution levels in their urban centers on pollutants coming from across the border following the festivities.

Long-Standing Pollution Problem

Extremely elevated levels of atmospheric toxins in Delhi have remained as a significant challenge for fifteen-plus years, with the problem gradually deteriorating.

Near celebratory seasons, the concentration of dangerous particles in the atmosphere has been documented to spike to seventy percent above the most severe readings ever measured in Beijing, which was previously viewed as the world's most polluted metropolis.

Various Pollution Contributors

This crisis in the capital is caused by a combination of multiple factors including heavy vehicle emissions, dust, development work, waste incineration and pollutants from crop residue ignition in neighbouring states of farming communities.

Throughout these areas, agricultural workers routinely set their fields on fire to clear them quickly, generating hazardous pollution that then gets trapped over the capital as winter air descends.

Public Health and Economic Impact

The economic and health toll on the approximately 33 million residents calling home the metropolitan zone is enormous, according to numerous studies.

These hazardous conditions results in elevated rates of neurological, heart and circulatory and lung diseases, and can even lead to oncological diseases.

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