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At what continuous decibel level will hearing loss occur?

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These sounds can damage sensitive structures in the inner ear and cause noise-induced hearing loss (NIHL). ... Exposure to harmful noise can happen at any age. read more

From Noise induced hearing loss risk assessment in truck drivers Karimi A, Nasiri S, Kazerooni FK, Oliaei M 65 dB(A) is normally taken as an acceptable level so levels above 80 dB(A) give serious cause for concern. A loss of hearing is typically the result of continuous exposure to high noise levels of 85 dB(A) and above for a number of years. read more

Sound is measured in units called decibels. Sounds of less than 75 decibels, even after long exposure, are unlikely to cause hearing loss. However, long or repeated exposure to sounds at or above 85 decibels can cause hearing loss. The louder the sound, the shorter the amount of time it takes for NIHL to happen. read more

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Must whales and dolphins be subjected to deafening noise that will cause more than 3.5 million instances of temporary and/or permanent hearing loss? For species that depend on hearing for survival - to find food, migrate, and communicate - any hearing loss could be catastrophic. As one scientist noted, a deaf whale is a dead whale.
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