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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.

 

Document History

  1. ISO 1999:2013


    Acoustics - Estimation of noise-induced hearing loss

    • Most Recent
  2. ISO 1999:1990

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    Acoustics - Determination of occupational noise exposure and estimation of noise-induced hearing impairment

    • Historical Version