A thick blanket of smog shrouded the national capital on Saturday morning, with the Air Quality Index (AQI) registering a reading of 431, under the 'severe' category, prompting the Commission for Air Quality Management (CAQM) to invoke Stage 4 of the Graded Response Action Plan (GRAP).

“Keeping in view the prevailing trend of air quality and in an effort to prevent further deterioration of air quality in the region, the CAQM Sub-Committee on GRAP decides to invoke all actions as envisaged under Stage-IV of the extant GRAP – ‘Severe+’ Air Quality (DELHI AQI > 450), with immediate effect, in the entire NCR,” read a statement from the CAQM.

This is in addition to the actions under Stages I, II and III of extant GRAP already in force in NCR, it added.

The curbs under GRAP-4 include ban on e

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