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2. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   A hearing protection device (HPD) is an ear protection device worn in or over the ears while exposed to hazardous noise to help prevent noise-induced hearing loss. HPDs reduce (not eliminate) the level of the noise entering the ear. HPDs can also protect against other effects of noise exposure such as tinnitus and hyperacusis.

3. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   See also: Plug (jewellery) Pre-molded earplugs (left), formable earplugs (center), and roll-down foam earplugs (right) An earplug is a device that is inserted in the ear canal to protect the user's ears from loud noises, intrusion of water, foreign bodies, dust or excessive wind. Since they reduce the sound volume, earplugs may prevent hearing ...

4. Noise-induced hearing loss - Wikipedia

   en.wikipedia.org/wiki/Noise-induced_hearing_loss

   Noise-induced hearing loss (NIHL) is a hearing impairment resulting from exposure to loud sound. People may have a loss of perception of a narrow range of frequencies or impaired perception of sound including sensitivity to sound or ringing in the ears. [1] When exposure to hazards such as noise occur at work and is associated with hearing loss ...

5. Do Loop earplugs actually work?

   www.aol.com/news/loop-earplugs-actually...

   Like most earplugs, Loops are designed to prevent noise-induced hearing loss and tinnitus, specifically when it comes to loud noise exposure during concerts and nightlife. Each earplug is about ...

6. Noise pollution - Wikipedia

   en.wikipedia.org/wiki/Noise_pollution

   v. t. e. Noise pollution, or sound pollution, is the propagation of noise or sound with ranging impacts on the activity of human or animal life, most of which are harmful to a degree. The source of outdoor noise worldwide is mainly caused by machines, transport and propagation systems. [1][2][3] Poor urban planning may give rise to noise ...

7. Hearing range - Wikipedia

   en.wikipedia.org/wiki/Hearing_range

   The commonly stated range of human hearing is 20 to 20,000 Hz. [6][7][note 1] Under ideal laboratory conditions, humans can hear sound as low as 12 Hz [8] and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditory channel of the cochlea. [9] The human auditory system is most sensitive ...