NEW DELHI: Restrictions on the movement of BS III petrol and BS IV diesel four-wheelers in Delhi, Gurgaon, Faridabad, Ghaziabad and Gautam Budh Nagar; work from home for 50% staff in govt and private offices in Delhi; hybrid mode for classes till IX and XI in Delhi; ban on construction and demolition activity, and barring the entry of non-essential trucks running on non-cleaner fuels in the city are among the restrictive measures under stage III and IV of the GRAP, which came into force from Saturday. After Delhi’s AQI touched 401 at 10 am on Saturday, the Commission for Air Quality Management (CAQM) imposed the Graded Response Action Plan’s stage III. However, stage IV was later invoked as AQI continued to rise. The AQI crossed 450 and reached the ‘severe plus’ range at 8 pm and it incr

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