NEW DELHI: The Centre on Tuesday invoked stricter anti-pollution measures under Stage III of the Graded Response Action Plan (GRAP) in Delhi-NCR after the city's air quality slipped into the 'severe' category. The Commission for Air Quality Management (CAQM) said the decision was taken after Delhi's average Air Quality Index (AQI) surged from 362 on Monday to 425 on Tuesday morning, due to calm winds, a stable atmosphere, and unfavourable weather conditions that allowed pollutants to accumulate near the surface. The Stage III curbs, which include a ban on non-essential construction and the closure of stone crushers and mining activities, build upon the measures already enforced under Stages I and II of the GRAP. Classes up to Class 5 are required to shift to hybrid mode under S

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