The national capital continued to breathe toxic air on Wednesday with pollution levels remaining ‘severe' for the second straight day at 418, as stubble-burning in the neighbouring regions contributed most to Delhi's foul air.

Delhi's Air Quality Index (AQI) remained ‘severe' with the 24-hour average recorded at 418 at 4 pm, according to Central Pollution Control Board (CPCB) data.

A ‘severe' AQI poses serious health risks even to healthy individuals, and can affect those with existing respiratory or cardiac conditions badly.

According to the Decision Support System (DSS) data, stubble-burning contributed 22.4 per cent to Delhi's PM2.5 concentration on Wednesday – the highest share from farm fires recorded so far this winter.

The share of pollution transported from outside the city sto

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