Delhi’s air quality continued to remain in the ‘very poor’ category on Wednesday, two days after Diwali. With the air quality index (AQI) being recorded at 353, the figure was marginally higher than Tuesday’s reading of 351, as per Central Pollution Control Board (CPCB) data.

Source apportionment data from the Decision Support System (DSS) for air quality management shows that the mix of pollution sources impacting Delhi has changed since Diwali on October 20.

At 36.06% of the total emissions, the DSS attributed the highest pollution load on Wednesday to the “others” category, which stands for unaccounted sources. The category broadly covers unaccounted or out-of-inventory sources beyond the study radius used by the DSS emission inventory.

According to DSS data, the transport sector w

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