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The Commission for Air Quality Management, a statutory body responsible for forming air pollution reduction strategies for the region and their implementation, noted a significant rise in Delhi’s AQI (458 and 457 at 10 am and 11 am) due to unfavourable climatic conditions and local pollution sources. Anticipating a prolonged period of severe air quality, the committee decided to implement GRAP Stage-III curbs (‘severe’ air quality index (AQI) range) immediately to prevent further deterioration.
The curbs include a ban on non-essential construction work and the plying of BS III petrol and BS IV deisel four-wheelers in the region.
Construction work related to national security or defence, projects of national importance, healthcare, railways, metro rail, airports, inter-state bus terminals, highways, roads, flyovers, overbridges, power transmission, pipelines, sanitation and water supply are exempted from the ban.
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It categorises actions into four stages: Stage I – ‘Poor’ (AQI 201-300); Stage II – ‘Very Poor’ (AQI 301-400); Stage III – ‘Severe’ (AQI 401-450); and Stage IV – ‘Severe Plus’ (AQI>450).