Delhi's overall Air Quality Index (AQI) stood at 460 as of 8 am on December 14, according to the data released by the Central Pollution Control Board. Several areas across the capital are marked as 'severe'.

Delhi’s air quality deteriorated sharply on Saturday, recording an AQI value at 448 at 7 pm. It prompted the Commission for Air Quality Management (CAQM) to invoke Stage IV measures of the Graded Response Action Plan (GRAP).

Few hours earlier, the CAQM had invoked GRAP III after noting the 24-hour AQI average at 431, which puts the index in the “severe” category. This was the worst recorded figure in the city this year till it was breached later in the day. The CAQM held two meeting within a span of few hours and moved the restriction category from Stage III to Stage IV.

According t

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