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As Tuesday dawned citizens of the planet's dirtiest urban center encountered breathing dangerously toxic air that was classified as the "severe" level.

Extremely High Air Quality Levels

Various sections of the capital showed an air quality index exceeding 500, which translates to a tenfold increase over the safe level established by the World Health Organization.

Particular areas, readings of PM2.5 and PM10 reached peaks of eighteen hundred, equating to fifteen to twenty times higher than healthy limits.

Fireworks Ban and Current Developments

Beginning in 2020, authorities had enforced a total prohibition on the purchase and ignition of pyrotechnics during Diwali due to their substantial impact to the deadly haze that blankets the metropolis as winter sets in.

Yet recently, the current local leadership appealed to the highest court to seek a modification of the restrictions.

Officials advocated for allowing "environmentally conscious pyrotechnics" – which have been criticized by environmentalists as being only approximately one-third lower impact – as a balance between "cultural practices and public health".

Court Verdict and Reality

Much to the frustration of environmental and health advocates, judicial authorities complied with the request, stipulating that green firecrackers could be set off during designated time windows throughout the Diwali.

During the celebrations, there was widespread disregard of the regulated periods across the capital, with little regulation regarding whether the pyrotechnics being used were actually the supposedly greener variety.

Many monitoring devices throughout the capital registered air quality peaking around late evening to extremely hazardous measurements seen during celebrations in at least three years.

International Implications

The widespread use of fireworks during the celebrations also initiated a blame game with bordering Pakistan, with representatives in Pakistani Punjab partly blaming worsening pollution levels in Lahore on hazardous particles originating in neighboring India following the festivities.

Chronic Pollution Problem

Alarmingly severe levels of air contamination in the capital have remained as a major challenge for over a decade and a half, with the condition showing no improvement.

Around the festival period, the levels of hazardous particulate matter in the air has been observed to spike to significantly exceeding the most severe records ever recorded in Beijing, which was formerly considered as the world's most polluted urban center.

Multiple Contamination Factors

The problem in the city is attributed to a convergence of multiple factors including automobile exhaust, dust, building projects, waste incineration and smoke from farm burning in adjacent regions of farming communities.

Throughout these areas, farmers regularly set their fields on fire to expedite field preparation, generating hazardous smog that becomes contained over the metropolitan area as winter air arrives.

Public Health and Financial Toll

Both financial and medical toll on the nearly 33 million residents calling home the Delhi area is substantial, according to numerous investigations.

The contaminated air leads to elevated rates of nervous system, heart and circulatory and breathing diseases, and can potentially cause cancer.

Air quality crisis is projected to be causing approximately 10k premature deaths each year in Delhi.