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As aging and other effects contribute to higher frequency loss (6–8 k Hz on an audiogram), this notch may be obscured and entirely disappear. Environmental Protection Agency has identified the level of 70 d B(A) (40% louder to twice as loud as normal conversation; typical level of TV, radio, stereo; city street noise) for 24‑hour exposure as the level necessary to protect the public from hearing loss and other disruptive effects from noise, such as sleep disturbance, stress-related problems, learning detriment, etc. Read More

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