Anti-pollution measures under GRAP-3 came into force in Delhi on Saturday as air quality slipped into the “severe” bracket. By noon, the national capital reported an Air Quality Index of 405, according to figures released by the Central Pollution Control Board (CPCB). Earlier in the day, Delhi’s AQI hovered close to 390 during the morning hours.Delhi Air Quality Hits ‘Severe'Each winter, Delhi and the surrounding NCR (National Capital Region) bring in curbs under the Graded Response Action Plan, which divides air quality into four levels: Stage 1 (Poor, AQI 201–300), Stage 2 (Very Poor, AQI 301–400), Stage 3 (Severe, AQI 401–450) and Stage 4 (Severe Plus, AQI above 450).Under GRAP-3, non-essential construction and demolition activities have been halted, along with stone crushing and mining

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