A day before Diwali, air quality in Delhi deteriorated sharply, with Akshardham recording an AQI of 426—classified as 'severe'—one of the highest levels this season, according to the Central Pollution Control Board (CPCB). Anand Vihar followed closely with an AQI of 418, while Barapulla registered 290, placing it in the 'poor' category on Sunday morning.

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