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OSHA 366 Portland State University Hearing Loss Health Discussion

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. Select one of the sources from this weeks’ Primary Reading Assignment (from Weekly Lessons & Assignments). 2. Please clearly identify which source you selected. 3. Discuss some aspect of the source that you found interesting and why. 4. Be sure to relate your post to some type of workplace hazard and/or method(s) for protecting employees from the hazard (controlling their risk). Occupational Noise Exposure and Hearing Conservation Every year, approximately 30 million people in the United States are occupationally exposed to hazardous noise. Noise-related hearing loss has been listed as one of the most prevalent occupational health concerns in the United States for more than 25 years. Thousands of workers every year suffer from preventable hearing loss due to high workplace noise levels. Since 2004, the Bureau of Labor Statistics has reported that nearly 125,000 workers have suffered significant, permanent hearing loss. In 2009 alone, BLS reported more than 21,000 hearing loss cases. Exposure to high levels of noise can cause permanent hearing loss. Neither surgery nor a hearing aid can help correct this type of hearing loss. Short term exposure to loud noise can also cause a temporary change in hearing (your ears may feel stuffed up) or a ringing in your ears (tinnitus). These short-term problems may go away within a few minutes or hours after leaving the noisy area. However, repeated exposures to loud noise can lead to permanent tinnitus and/or hearing loss. Loud noise can also create physical and psychological stress, reduce productivity, interfere with communication and concentration, and contribute to workplace accidents and injuries by making it difficult to hear warning signals. Noise-induced hearing loss limits your ability to hear high frequency sounds, understand speech, and seriously impairs your ability to communicate. The effects of hearing loss can be profound, as hearing loss can interfere with your ability to enjoy socializing with friends, playing with your children or grandchildren, or participating in other social activities you enjoy, and can lead to psychological and social isolation.      How does the ear work? What are the warning signs that your workplace may be too noisy? How loud is too loud? What can be done to reduce the hazard from noise? How can OSHA help? How does the ear work? When sound waves enter the outer ear, the vibrations impact the ear drum and are transmitted to the middle and inner ear. In the middle ear three small bones called the malleus (or hammer), the incus (or anvil), and the stapes (or stirrup) amplify and transmit the vibrations generated by the sound to the inner ear. The inner ear contains a snail-like structure called the cochlea which is filled with fluid and lined with cells with very fine hairs. These microscopic hairs move with the vibrations and convert the sound waves into nerve impulses–the result is the sound we hear. Exposure to loud noise can destroy these hair cells and cause hearing loss! What are the warning signs that your workplace may be too noisy? Noise may be a problem in your workplace if:    You hear ringing or humming in your ears when you leave work. You have to shout to be heard by a coworker an arm’s length away. You experience temporary hearing loss when leaving work. 1 How loud is too loud? Noise is measured in units of sound pressure levels called decibels, named after Alexander Graham Bell, using A-weighted sound levels (dBA). The A-weighted sound levels closely match the perception of loudness by the human ear. Decibels are measured on a logarithmic scale which means that a small change in the number of decibels results in a huge change in the amount of noise and the potential damage to a person’s hearing. OSHA sets legal limits on noise exposure in the workplace. These limits are based on a worker’s time weighted average over an 8 hour day. With noise, OSHA’s permissible exposure limit (PEL) is 90 dBA for all workers for an 8 hour day. The OSHA standard uses a 5 dBA exchange rate. This means that when the noise level is increased by 5 dBA, the amount of time a person can be exposed to a certain noise level to receive the same dose is cut in half. The National Institute for Occupational Safety and Health (NIOSH) has recommended that all worker exposures to noise should be controlled below a level equivalent to 85 dBA for eight hours to minimize occupational noise induced hearing loss. NIOSH has found that significant noise-induced hearing loss occurs at the exposure levels equivalent to the OSHA PEL based on updated information obtained from literature reviews. NIOSH also recommends a 3 dBA exchange rate so that every increase by 3 dBA doubles the amount of the noise and halves the recommended amount of exposure time. Here’s an example: OSHA allows 8 hours of exposure to 90 dBA but only 2 hours of exposure to 100 dBA sound levels. NIOSH would recommend limiting the 8 hour exposure to less than 85 dBA. At 100 dBA, NIOSH recommends less than 15 minutes of exposure per day. In 1981, OSHA implemented new requirements to protect all workers in general industry (e.g. the manufacturing and the service sectors) for employers to implement a Hearing Conservation Program where workers are exposed to a time weighted average noise level of 85 dBA or higher over an 8 hour work shift. Hearing Conservation Programs require employers to measure noise levels, provide free annual hearing exams and free hearing protection, provide training, and conduct evaluations of the adequacy of the hearing protectors in use unless changes to tools, equipment and schedules are made so that they are less noisy and worker exposure to noise is less than the 85 dBA. What can be done to reduce the hazard from noise? Noise controls are the first line of defense against excessive noise exposure. The use of these controls should aim to reduce the hazardous exposure to the point where the risk to hearing is eliminated or minimized. With the reduction of even a few decibels, the hazard to hearing is reduced, communication is improved, and noise-related annoyance is reduced. There are several ways to control and reduce worker exposure to noise in a workplace. Engineering controls that reduce sound exposure levels are available and technologically feasible for most noise sources. Engineering controls involve modifying or replacing equipment, or making related physical changes at the noise source or along the transmission path to reduce the noise level at the worker’s ear. In some instances the application of a relatively simple engineering noise control solution reduces the noise hazard to the extent that further requirements of the OSHA Noise standard (e.g., audiometric testing (hearing tests), hearing conservation program, provision of hearing protectors, etc…) are not necessary. Examples of inexpensive, effective engineering controls include some of the following:     Choose low-noise tools and machinery (e.g., Buy Quiet Roadmap (NASA)). Maintain and lubricate machinery and equipment (e.g., oil bearings). Place a barrier between the noise source and employee (e.g., sound walls or curtains). Enclose or isolate the noise source. 2 Administrative controls are changes in the workplace that reduce or eliminate the worker exposure to noise. Examples include:     Operating noisy machines during shifts when fewer people are exposed. Limiting the amount of time a person spends at a noise source. Providing quiet areas where workers can gain relief from hazardous noise sources (e.g., construct a sound proof room where workers’ hearing can recover – depending upon their individual noise level and duration of exposure, and time spent in the quiet area). Restricting worker presence to a suitable distance away from noisy equipment. Controlling noise exposure through distance is often an effective, yet simple and inexpensive administrative control. This control may be applicable when workers are present but are not actually working with a noise source or equipment. Increasing the distance between the noise source and the worker, reduces their exposure. In open space, for every doubling of the distance between the source of noise and the worker, the noise is decreased by 6 dBA. Hearing protection devices (HPDs), such as earmuffs and plugs, are considered an acceptable but less desirable option to control exposures to noise and are generally used during the time necessary to implement engineering or administrative controls, when such controls are not feasible, or when worker’s hearing tests indicate significant hearing damage. An effective hearing conservation program must be implemented by employers in general industry whenever worker noise exposure is equal to or greater than 85 dBA for an 8 hour exposure or in the construction industry when exposures exceed 90 dBA for an 8 hour exposure. This program strives to prevent initial occupational hearing loss, preserve and protect remaining hearing, and equip workers with the knowledge and hearing protection devices necessary to protect them. Key elements of an effective hearing conservation program include:          Workplace noise sampling including personal noise monitoring which identifies which employees are at risk from hazardous levels of noise. Informing workers at risk from hazardous levels of noise exposure of the results of their noise monitoring. Providing affected workers or their authorized representatives with an opportunity to observe any noise measurements conducted. Maintaining a worker audiometric testing program (hearing tests) which is a professional evaluation of the health effects of noise upon individual worker’s hearing. Implementing comprehensive hearing protection follow-up procedures for workers who show a loss of hearing (standard threshold shift) after completing baseline (first) and yearly audiometric testing. Proper selection of hearing protection based upon individual fit and manufacturer’s quality testing indicating the likely protection that they will provide to a properly trained wearer. Evaluate the hearing protectors attenuation and effectiveness for the specific workplace noise. Training and information that ensures the workers are aware of the hazard from excessive noise exposures and how to properly use the protective equipment that has been provided. Data management of and worker access to records regarding monitoring and noise sampling. Each of these elements is critical to ensure that workers are being protected where noise levels are unable to be reduced below the OSHA required levels. 3 Peers response: First post : I chose the article “Hearing loss associated with US military combat deployment”. I found this article interested because I was in the Marine Corps and experience some hearing loss and tinnitus. Protecting your hearing is no joke because once it is gone, you cannot get it back. Being in the infantry, our job was to shoot, move and communicate. The problem with that is, to communicate, you need to be able to hear over the gun fire. Well, with hearing protection in, it makes that incredibly hard to do on top of the loud guns blazing. So almost all the time, we opted to not wear any hearing protection. I wish I would have more often because I am now paying for it with migraines and constant high pitch ringing in my ears and it is extremely unpleasant. You may have heard about military personnel using the defective 3M hearing protection and that there is a huge lawsuit in accordance with that. Unfortunately there are a lot of my friends that were a part of that, and like I said earlier, some that just didn’t wear any at all. As Safety Professionals, we need to encourage hearing protection as often as we can. The little foamies are extremely cheap and well worth the 20 cents or whatever they cost to ensure your employees don’t have long term effects of loud noises. Second post: In Hearing loss associated with US military combat deployment, studies show with 48,540 participants that 7.5 (a little over 3,600 affected) during and after a deployment has hearing loss. The studies implications for health care and disability planning, as well as for a prevention program. Hearing loss is a health and readiness issue for US military when exposed to hazardous noise. As someone who is in the Army National Guard I have not been deployment, but I’ve heard the stories from my unit. I can see how many soldiers (how the Army refers to members, its different in branches) can relate to hearing loss. Especially when job is exposed in the combat zone. For example, it was before I joined, but in 2010 my unit was deployed at Afghanistan. There mission was to go a convey to drop off supplies to a local city. They have done this mission many of time, this day was different. Members got hit by an IED (a bomb), long story short some of the members was discharged for varies reason, one reason did include hearing lost. Since I’ve been in the Army, I learn my lesson if I get hurt while in uniform I always ask for line of duty (LOD, documentation you have injured yourself while on duty). In my LOD I have include that I have fracture both of my hips, and that my hearing has got worst. Reason why I keep update my LOD is for the future. When I get older I can eventually use my documentation to have prove my hearing lost began while I was in the Army, and the VA can provide assistance for me.
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