As the air quality in Delhi dipped to the “severe+” category, the Commission for Air Quality Management on Saturday imposed Stage 4 restrictions under the Graded Response Action Plan to control pollution in the National Capital Region. GRAP is a set of incremental anti-pollution measures that are triggered to prevent further worsening of air quality once it reaches a certain threshold in the Delhi-NCR region.

Earlier in the day, the authority had reimposed Stage 3 restrictions under the plan, which mandate a ban on non-essential construction work and the closure of stone crushers and mining activities.

Stage 4 of GRAP is implemented when the Air Quality Index in Delhi breaches the 450-mark. It includes a ban on trucks entering the region and halting construction activities for public

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