It is said that the Indians of the north-western prairies by applying their ears to the ground, could detect the approach of cavalry at a distance beyond the reach of vision, and distinguish their tread from that of a herd of buffaloes.
Do you know that the DJs at night clubs
actually protect their hearing (with ear PLUGS) while they damage yours?
Airport ground staff are commonly exposed to 140+dB every time an aircraft takes off. There isn’t much airports can do to control the noise, for this reason, you’ll usually see workers wearing hearing protection and communicating with hand signals.
What about the generator noise from neighbours?
Noise Induced Hearing Loss!!!
Noise induced hearing loss is a permanent hearing impairment resulting from prolonged exposure to high levels of noise. Minor hearing loss that affects our ability to understand normal speech. Excessive noise exposure is the most common cause of hearing loss.
Loud noise also causes permanent tinnitus, which is a ringing, buzzing or rushing sound in the ears that is always there and never goes away. Many people find this unpleasant and annoying. Tinnitus can make it difficult for people to get to sleep because it is most noticeable in a quiet environment. There is no cure for hearing loss or tinnitus caused by exposure to loud noise / sound. Hearing aids can help, but they do not normally provide the full quality of hearing that was enjoyed prior to damage by loud noise.
The level at which noise can start to become harmful to your hearing is 80 dB for 8 hours. That’s equivalent to a domestic vacuum cleaner.
As the noise level increases, the amount of time you can be exposed to it before causing damage to your hearing decreases.
- 85 dB – 8 Hours
- 88 dB – 4 Hours
- 91 dB – 2 Hours
- 94 dB – 1 Hour
- 97 dB – 30 Minutes
- 100 dB – 15 Minutes
- 103 dB – 7.5 Minutes
- 106 dB – 3.75 Minutes
- 109 dB – 1.875 Minutes
- 112 dB – 56 Seconds
- 115 dB – 28 Seconds
If you know you're going to be hearing loud sounds for more than a few minutes, think about wearing protection, such as:
- Earplugs. Usually made of foam or rubber, earplugs go in your ear canal and can reduce noise by 15 to 30 decibels. You can buy them off-the-shelf or have them custom-made to fit you.
Some ear plugs are designed to reduce noise levels evenly across all frequencies. They’re useful for people who need to make sound quieter but undistorted, such as musicians.
- Earmuffs. These fit completely over your ears and reduce sounds by about 15 to 30 decibels. Remember that your earmuffs must fit tightly over both ears to block sound.
You can also wear earplugs and earmuffs together for even greater protection.
How to Fit Ear Protectors Correctly
Ear Plugs
It is very common for ear plugs to be inserted incorrectly such that they provide little reduction in noise exposure. To insert an ear plug, pull the top of the ear upwards to straighten the ear canal, and then push the plug in fully until it makes a very good seal.
If using foam plugs, it is essential to first roll the plug into a thin cylinder between the finger and thumb. Then insert the plug while pulling the top of the ear upwards. Hold the ear plug in place with your forefinger long enough for the foam to expand fully and seal the ear canal. Repeat for the other plug.
Note how the noise changes on inserting ear plugs. If the noise does not appear considerably quieter and "muffled", then one or both of the ear plugs have been fitted incorrectly and must be adjusted by pushing them further in, or by removing and re-inserting them. It is common for ear plugs to become slightly dislodged or loosen over time, due to jaw movements (talking, yawning, etc.).
Remove ear plugs slowly. We have heard of a case where someone perforated his ear drum by removing an ear plug quickly.
The noise reduction achieved by foam ear plugs falls each time the plugs are rolled into a small diameter cylinder ready for insertion. So, it is important to replace foam ear plugs with new ones frequently. Our personal experience is that to maintain high performance, they should be replaced after being rolled twice at most.
Ear Muffs
It is much easier to fit ear muffs correctly than ear plugs. Make sure the whole ear is inside the muff seal. A good seal between the user's head and the muffs is crucial. Remove long earrings and push hair back such that they are not under the muff seals. If you wear glasses, this can lower the noise reduction because it interferes with the seal. The loss of performance is usually relatively small unless the glasses have thick or wide side arms.
Make sure the headband is on top of the head. Do not over-stretch the headband by pulling the muff cups a long way apart because this reduces the effectiveness of the seals.
To maintain performance, the seals and entire muffs must be replaced from time to time.
international Noise Awareness Day is a global campaign, founded in 1996 by the Center of Hearing and Communication (CHC), aiming to raise awareness of noise on the welfare and health of people. Noise affects people in many ways, but only deafness and annoyance receive actual interest from the general public
The day is commemorated on the last Wednesday of April of every year. It is organized in several countries all over the world, such as in Brazil, Chile, Germany, Italy, Spain and the United States of America.
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