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Signs and Symptoms of noise-induced hearing loss

Noise levels are measured in decibel, dB, with the lowest audible sound measured at 0 and the loudest sound possible reaching 194dB. The scale is logarithmic. An increase by 10 dB indicates a multiple increase in sound intensity or power. A level of a normal conversation is about 65 dB. In most countries, a sustained noise level of 85 dB over eight hours a day in, for example, your workplace is considered the upper safe noise limit in most countries. In the US, however, the Occupational Safety and Health Administration, OSHA, still operates on the basis of a safe upper noise-induced hearing loss level signi􀂡cantly higher at 90dB.

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