According to a Swiss manufacturer of air quality equipment called IQAir, the air quality in India’s capital of New Delhi degraded to “hazardous” levels on Tuesday, due in part to the large quantity of fireworks detonated during the holiday festival of Diwali.

IQAir said New Delhi had the most polluted air of any major city in the world on Tuesday, with concentrations of particulate matter over 59 times higher than the limit for healthy air specified by the World Health Organization (WHO).

“During Diwali which officially begins October 20, air quality typically worsens due to the use of firecrackers, agricultural stubble burning, and regular urban emissions from vehicles and industry,” the company noted.

The Indian government’s Central Pollution Control Board (CPCB) disagreed with

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