Any sound level over 80dB (decibel), may cause inner ear hearing loss. Two factors are of dominant importance: duration of exposure and intensity of sound. Close up intense unhealthy sounds lasting microsecond such as gunshots, explosions, fire crackers may cause severe permanent hearing loss. Longer exposure to high intensity sounds such as music, vacuüm cleaners, lawnmower, electrical kitchen appliances, vehicle horns, sirens and industrial noise may also cause noise damage.
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