A Review of Hearing Damage Risk Criteria

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Abstract
At least thirty-five authors have proposed Damage Risk Criteria and these have been reviewed by the present author who considers that 90dB(A), being a single-measurement limit, is the simplest and most practical criterion for everyday applications. For noise control purposes or for the estimation of the effects of short or intermittent exposure, the I.S.O. noise rating curves should be consulted, the curve corresponding to noise rating number 85 being taken as equivalent to the Damage Risk Criterion. It seems logical to conclude that if the duration of exposure to noise is reduced, then the resulting hearing loss will also be reduced. However, a simple time-intensity relationship does not apply and maximum permissible exposure durations are recommended by Glorig et al. (1961). Where the exposure is intermittent, noise rating number, exposure time and recovery time between exposure cycles must also be taken into account. Research is at present in progress on the effects of impulsive noise and it is hoped that a Damage Risk Criterion for this type of noise will soon be formulated.

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