What is GRAP stage IV, and what steps are being taken under it to limit pollution in Delhi-NCR?

Delhi’s air quality worsened to the ‘severe plus’ category on Monday with the city recording an AQI of 484. Tighter pollution control measures, under stage 4 of the Graded Response Action Plan came into force in the morning. The seven key restrictions enforced under GRAP IV are as follows.

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