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The National Institute for Occupational Safety and Health (NIOSH) recognizes that the majority of hearing loss is not due to age, but due to noise exposure.
0 d B does not represent absence of sound, but rather the softest sound an average unimpaired human ear can hear; some people can hear down to -5 or even -10 d B. But the ear doesn't hear all frequencies equally well; hearing sensitivity peaks around 3000 Hz.Estimation of a "safe" duration of exposure is possible using an exchange rate of 3 d B.As 3 d B represents a doubling of intensity of sound, duration of exposure must be cut in half to maintain the same energy dose.Noise-induced hearing loss (NIHL) typically manifests as elevated hearing thresholds (i.e.less sensitivity or muting) between 30 Hz, centered at 4000 Hz.
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For workplace noise regulation, the "safe" daily exposure amount at 85 d B A, known as an exposure action value, is 8 hours, while the "safe" exposure at 91 d B(A) is only 2 hours.