Delhi’s AQI hits 426: Doctors warn toxic air is damaging your heart, immune system and mental health

As Delhi prepares for Diwali, the city is once more enveloped in a dense grey smog. On the festival's eve, the Air Quality Index (AQI) in the capital reached 278 (poor), while Anand Vihar registered a severe 426, indicating the return of hazardous air.

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