At 655, Air in Parts of Delhi Turns 'Hazardous' Post Diwali as Crackers Burst Despite Ban
An AQI between zero and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.
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