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With the assistance of a noise-control engineer and following the general principles outlined by aiha, Colgate-Palmolive identified and prioritized noise sources.
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To calculate the intensity level in decibels, find the ratio of the intensity ( I ) of sound to the threshold intensity ( I0 ).

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Only sounds 90 dBA and higher are integrated into the PEL (i.e., the threshold level is 90 dBA).
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