Meghan Hodges
Noise pollution is a serious issue that can have detrimental effects on both human and animal health. Research has shown that noise pollution is associated with cardiovascular disorders, hypertension, high stress levels, tinnitus, hearing loss, sleep disturbances, and other harmful effects. In animals, noise can increase the risk of death by interfering with their ability to detect predators or prey, navigate, and reproduce. Hazardous noise levels are generally considered to be 85 dBA or higher, and can occur in various environments, including workplaces, urban areas, and during recreational activities. To protect individuals from the harmful effects of noise pollution, various measures can be implemented, such as engineering controls, administrative controls, and the use of personal protective equipment.
| Characteristics | Values |
|---|---|
| Hazardous noise level | 85 dBA or higher |
| Safe listening time at 85 dBA | 8 hours |
| Safe listening time at 88 dBA | 4 hours |
| Safe listening time at 91 dBA | 2 hours |
| World Health Organization's recommendation for adults | 40 hours of weekly exposure to volume levels no higher than 80 dB |
| World Health Organization's recommendation for children | 75 dB |
| Workplace noise sampling | Personal noise monitoring |
| Hearing protection devices | Earmuffs and earplugs |
| Noise controls | Engineering controls, administrative controls, and personal protective equipment |
| Health problems caused by noise | Cardiovascular effects, coronary artery disease, hypertension, high stress levels, tinnitus, hearing loss, sleep disturbances |
| Industries with hazardous noise | Mining, manufacturing, and construction |
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What You'll Learn
The negative effects of noise pollution
Noise pollution has been identified as one of the most dangerous environmental threats to human health by the World Health Organization (WHO). It is defined by the WHO as noise that exceeds 65 decibels (dB). When it surpasses 75 dB, noise becomes harmful, and at levels above 120 dB, it is painful.
Noise pollution has a range of negative effects on both physical and mental health. Physically, noise pollution can cause hearing impairment, tinnitus, and hypertension. It can also contribute to cardiovascular issues such as increased blood pressure, blood viscosity, and vasoconstriction. Research has also found links between noise pollution and ischemic heart disease, with a 29% higher risk for those exposed to intense noise in the workplace. Furthermore, noise pollution can lead to sleep disturbances, affecting the depth and quality of sleep, which in turn can impact an individual's mood and ability to concentrate.
The impact of noise pollution on mental health is also significant. It can trigger anxiety, stress, irritability, and frustration. The feeling of a lack of control over the noise in one's environment can intensify these negative mental health effects. Children are particularly vulnerable to the adverse consequences of noise pollution.
Noise pollution also has ecological repercussions. According to the National Park Service (NPS) in the United States, noise pollution has a substantial environmental impact and inflicts severe harm on wildlife. It can interfere with breeding cycles and contribute to the extinction of certain species.
To mitigate the negative effects of noise pollution, various measures can be implemented. These include engineering controls, administrative controls, and the use of personal protective equipment (PPE) in the workplace. Engineering controls involve modifying equipment or making physical changes to reduce noise levels, while administrative controls aim to reduce exposure duration, frequency, or level. Providing quiet areas for workers to escape hazardous noise sources is another effective strategy. Additionally, soundproofing and turning off devices can help reduce noise levels in homes, schools, and workplaces.
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Industries with high noise levels
Noise-induced hearing loss (NIHL) is a common issue, with loud noises such as gunfire or explosions causing damage to hair cells. According to the CDC, around 22 million US workers are exposed to dangerous noise levels each year, with noise levels reaching over 90 decibels (dB). The Occupational Safety and Health Administration (OSHA) has set a legal limit of 90 dB as the permissible exposure limit (PEL) for an 8-hour period. However, noise levels as low as 85 dB can cause hearing loss if exposure exceeds 8 hours.
Several industries are associated with high noise levels, and workers in these sectors are at a higher risk of developing hearing loss over time. These industries include:
- Manufacturing: The use of machine tools, presses, milling machines, and other equipment in manufacturing can produce noise levels exceeding 85 dB.
- Construction: Construction workers are exposed to loud noises from drills, excavators, blasting equipment, bulldozers, jackhammers, and other tools. Research found that construction workers in Washington experienced noise levels above 85 dB 70% of the time.
- Mining and Metallurgy: Constantly moving equipment and metalworking processes in mining and metallurgy create excessive noise. The acoustic pressure in these environments can be continuous or impulsive, with impulsive noise being more damaging to hearing.
- Data Centers: Large servers, network switches, routers, and air conditioning equipment in data centers produce high levels of ambient noise that can impact employee health and concentration.
- Ground Crews: Ground crews working in the aviation industry are exposed to extremely high noise levels during aircraft take-off and landing.
- Oil and Gas: Workers in the oil and gas industry often encounter high noise levels from gas-powered equipment and heavy industrial equipment.
The noise levels in these industries can have various adverse effects on workers, including hearing loss, increased fatigue, irritability, and reduced concentration and productivity.
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Preventing noise-induced hearing loss
Noise-induced hearing loss (NIHL) is a common condition that affects people of all ages. It is caused by exposure to excessively loud sounds and can result from a one-time exposure to a very loud noise or listening to loud sounds over an extended period. While NIHL is preventable, it is important to note that it cannot be medically or surgically corrected.
To prevent noise-induced hearing loss, it is crucial to understand the risks associated with loud noises. According to the World Health Organization (WHO), safe listening practices for adults involve limiting exposure to volume levels no higher than 80 dB for a total of 40 hours per week. For children, the recommended volume level is 75 dB. These guidelines help ensure that individuals do not exceed safe listening times, which decrease as noise levels increase. For example, at 85 dB, the safe listening time is 8 hours, but this duration is reduced to 4 hours at 88 dB and 2 hours at 91 dB.
In addition to adhering to safe listening practices, there are several other measures that can be taken to prevent noise-induced hearing loss:
- Utilize hearing protection: When participating in loud activities or when exposed to hazardous noise levels, it is essential to wear hearing protection such as earplugs or earmuffs. For activities with noise levels above 105 dB for 8 hours or more, consider using both earplugs and earmuffs together for maximum protection.
- Maintain distance from loud noises: Increasing the distance between the source of the noise and the listener can effectively reduce noise exposure. In an open space, doubling the distance from the source results in a 6 dB reduction in noise level.
- Engineering controls: In workplaces, engineering controls can be implemented to reduce sound exposure levels. This involves modifying or replacing equipment or making physical changes to the environment to reduce noise levels.
- Administrative controls: These are work practices that aim to reduce the duration, frequency, or level of exposure to loud noises. Examples include scheduling noisy work when fewer workers are present, providing breaks and quiet areas, and giving workers shifts that include quieter tasks.
- Hearing Conservation Programs: Employers can implement Hearing Conservation Programs to protect workers from hazardous noise levels. This includes measuring noise levels, providing annual hearing exams and hearing protection, conducting training, and evaluating the adequacy of hearing protection methods.
By following these guidelines and taking proactive measures to reduce noise exposure, individuals can effectively prevent noise-induced hearing loss and protect their hearing health.
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Measuring noise levels
Noise levels are measured in decibels (dB), which are units of sound intensity or sound pressure. Decibels are measured on a logarithmic scale, which represents how humans perceive changes in sound intensity. On a linear scale, an increase of 10 units results in a proportional increase in intensity. However, on the decibel scale, an increase of 10 decibels results in a tenfold increase in sound intensity, which is perceived as a sound that is about twice as loud.
The decibel scale is based solely on sound intensity, whereas the dBA scale, or A-weighted decibels, takes into account both intensity and how the human ear responds to sound. The dBA scale is typically used to describe sound level recommendations for healthy listening.
To measure decibels, one can use professional decibel meters, also known as sound level meters or noise dosimeters. These devices use a sensitive microphone to measure sound pressure waves or vibrations and provide precise decibel level readings. They can be expensive, but there are also cheaper alternatives, such as installing specialised software on a computer or using a phone or tablet app. Sound level apps use the device's built-in microphone to capture sound and provide decibel readings, which can be just as accurate as professional equipment if properly calibrated.
When measuring sound decibels, it is important to consider factors such as the distance and direction of the noise source, as well as ambient sounds, as these can affect the readings. The best practice is to stand as close to the source as possible while avoiding any obstacles or other noises that might interfere with the sound waves.
In the context of workplace noise, there are additional considerations for measuring noise levels. The first step is to determine if noise is a potential issue by conducting a walk-through survey. Indicators of hazardous noise levels include noise levels louder than busy city traffic, the need to raise one's voice to be heard by someone at a close distance, and employees experiencing ringing or humming noises after leaving work. The next step is to assess personal noise exposure levels, especially if noise levels vary throughout the day or if workers are mobile. This can be done using sound level meters (SLMs) or noise dosimeters, which measure instantaneous noise levels and average exposure over a work shift, respectively. SLMs consist of a microphone, electronic circuits, and a readout display, and they are typically held at arm's length at ear height for those exposed to the noise. It is important to calibrate these devices before and after each use and to follow the manufacturer's instructions for accurate measurements.
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Reducing noise exposure
Noise-induced hearing loss (NIHL) occurs when one listens to loud sounds over a long period, such as at a concert, or from a short, sharp burst of sound, like gunfire. The louder the noise, the higher the noise level, which is measured in decibels or dB(A).
According to the World Health Organization, it is safe to listen to sounds at 70 dB(A) or lower for as long as you want. Sounds at 85 dB(A) can lead to hearing loss if you listen to them for more than eight hours at a time. The safe listening time is cut in half for every 3-dB rise in noise levels over 85 dB(A). For example, if the sound level rises to 88 dB(A), it is safe to listen for only four hours, and if it goes up to 91 dB(A), safe listening time is just two hours.
Noise exposure is a risk across all industries, but hazardous noise is most common in mining, manufacturing, and construction. Employers should take steps to prevent hazardous noise exposure in the workplace, and in 1981, the Occupational Safety and Health Administration (OSHA) implemented new requirements to protect all workers in general industry. These include:
- Providing quiet areas where workers can gain relief from hazardous noise sources
- Restricting worker presence to a suitable distance away from noisy equipment
- Controlling noise exposure through distance – in open spaces, for every doubling of the distance between the noise source and the worker, the noise is decreased by 6 dB(A)
- Hearing protection devices (HPDs) such as earplugs and earmuffs, which can be used together to cut noise down
- Using sound-level meters to measure noise levels
- Informing workers at risk from hazardous levels of noise exposure of the results of their noise monitoring
- Implementing comprehensive hearing protection follow-up procedures for workers who show signs of hearing loss
- Engineering controls – modifying or replacing equipment, or making related physical changes at the noise source or along the transmission path to reduce noise levels
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Frequently asked questions
The World Health Organization recommends a total of 40 hours of weekly exposure to volume levels no higher than 80 dB for adults and 75 dB for children on personal listening devices.
The NIOSH REL is 85 A-weighted decibels (dBA) averaged over an eight-hour workday. The length of daily exposure must be reduced for every 3 dBA increase in noise level.
The Occupational Safety and Health Administration has set the permissible exposure limit (PEL) for noise as a TWA of 90 dB(A) for an eight-hour workday. However, in manufacturing and service industries, if the TWA exceeds 85 dB(A), employers must implement a Hearing Conservation Program.
