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ISO 1999:1990
M00000954
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ISO 1999:1990 Acoustics - Determination of occupational noise exposure and estimation of noise-induced hearing impairment
standard by International Organization for Standardization, 01/01/1990
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Prescribes a practical relation for these quanitities expressed as A-weighted noise level in dB and duration of exposure within a normal working week (40 hours) and the percentage of personnel that is to be expected to obtain a raised hearing threshold of 25 dB or more as a result of this exposure, averaged from 500, 1000 and 2000 Hz.