Pollution Problem in Delhi NCR

 
GRAP 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).

How about Severe Ultra for Stage V?
 
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