NEW DELHI: Delhi’s air quality deteriorated sharply on Saturday, slipping into the ‘severe’ category and prompting authorities to impose stricter anti-pollution measures under Stage 3 of the Graded Response Action Plan (GRAP).

According to data from the Central Pollution Control Board (CPCB), the city recorded an Air Quality Index (AQI) of 405 at noon, while early morning readings hovered around 390, signalling a steady worsening of conditions.

With winter setting in, Delhi and the National Capital Region (NCR) routinely enforce GRAP restrictions, which are triggered based on pollution levels. Under the framework, Stage 3 comes into force when the AQI breaches the 401 mark, indicating severe air quality with serious health implications, particularly for children, the elderly and those wi

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