As Winter Pollution Curbs Kick In, Delhi AQI Slips Into 'Very Poor' Category
NDTV
Under the AQI scale, a reading between 0 and 50 is considered 'good', 51-100 'satisfactory', 101-200 'moderate', 201-300 'poor', 301-400 'very poor' and 401-500 'severe'.
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