Noise Pollution Level Calculation

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Level exceeded 10 Percent of Time(dB)  
Level exceeded 50 Percent of Time(dB)  
Level exceeded 90 Percent of Time(dB)  
Description (-)
Calculate Noise Pollution Level.

Formula :
NPL=L50+L10-L90+(L10-L90)2/60

where,
NPL = Noise Pollution Level,
L10 = Level exceeded 10 Percent of Time,
L50 = Level exceeded 50 Percent of Time,
L90 = Level exceeded 90 Percent of Time.
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