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Graded Response Action Plan (GRAP) Background An AQI between 0-50 is considered ‘good’, 51-100 ‘satisfactory’, 101-200 ‘moderate’, 201-300 ‘poor’, 301-400 ‘very poor', and 401-500 ‘severe’. Above 500 falls in the ‘severe-plus emergency’ category. Measures announced under Graded Response Action Plan (GRAP)- Severe+ or Emergency- (PM 2.5 over 300 µg/cubic meter or PM10 over 500 µg/cu. m. fo
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