The critical intensity for occupational noise.
Decades of medical examinations have shown that large-scale risks of hearing defects exist not only from 90 dB(A) upwards, but even from 85 dB(A) upwards. This experience is confirmed by the analysis of 25,000 tone threshold audiograms and by the results of experimental hearing fatigue tests.
D001301:Audiometry, Pure-Tone; D001305:Auditory Fatigue; D001309:Auditory Threshold; D006317:Hearing Loss, Noise-Induced / Q000209:etiology*; D006801:Humans; D009622:Noise / Q000009:adverse effects*; D009784:Occupational Diseases / Q000209:etiology*