Brian Barton
Noise pollution is any unwanted sound that interferes with hearing and is generally caused by humans. Sources of noise pollution include construction, transportation, industrial activity, and domestic activities. It can cause stress, hamper concentration, cause accidents, and lead to high blood pressure, speech interference, hearing loss, and sleep disruption. Noise pollution also affects animals, causing stress, fertility problems, and changes in migration routes. It can also physically hurt animals by shaking their internal body parts. Great apes have similar hearing capabilities to humans, but other animals perceive noise differently.
| Characteristics | Values |
|---|---|
| Definition | Noise pollution is any unwanted sound that impairs or interferes with hearing. |
| Sources | Machine or amplified sound sources, including transportation vehicles, motor vehicles, aircraft, rail activities, construction, industrial activity, and domestic activities. |
| Effects on Humans | Stress, mild irritation, learning and memory problems, permanent hearing damage, heart disease, high blood pressure, speech interference, sleep disruption, loss of productivity, communication issues, and headaches. |
| Effects on Animals | Pain, fear, cognitive problems, fertility issues, migration changes, hearing loss, disorientation, confusion, and changes in mating behaviors. |
| Measurement | Decibels (dB), which can be measured with a handheld device or a decibel meter/sound meter. |
| Variation | Noise levels vary based on location, time of day, and population density. |
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What You'll Learn
Noise sources and their impact
Noise pollution is typically caused by humans and is defined as any unwanted, loud sound that causes adverse effects. These effects can include hearing loss, communication issues, headaches, stress, sleep disruption, high blood pressure, and speech interference.
Sources of noise pollution include transportation, industrial activity, and domestic activities. Transportation noise comes from motor vehicles, aircraft, and rail activities. Industrial activity includes construction, manufacturing, and power generation. Domestic activities encompass a range of everyday human activities, from social gatherings to lawn mowing.
The impact of noise pollution on humans and animals can be severe and wide-ranging. For humans, noise pollution can cause mild irritation, learning and memory problems, permanent hearing damage, and heart disease. It can also lead to increased stress levels, negatively impacting overall health and well-being.
The effects of noise pollution on animals are equally concerning. Animals in close contact with humans, such as pets, farm animals, and zoo animals, are particularly vulnerable. Research has shown that confined animals exposed to high noise levels they cannot escape experience pain, fear, and cognitive problems. For example, loud noises can cause physical damage to the internal body parts of animals, such as the swim bladder in fish, affecting their hearing and buoyancy. Additionally, one noisy event, such as a music festival or extreme weather, can trigger long-term fear in animals, causing them to hide or seek comfort.
Noise pollution also affects wildlife, impacting their communication, migration, and mating behaviors. For example, caterpillars experience physiological stress from highway noise, and whales suffer from hearing loss and disrupted communication due to noise in aquatic ecosystems.
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Measuring noise pollution
Noise pollution is defined as "a nuisance", referring to any unwanted sounds that impair or interfere with hearing and are generally caused by humans. Noise pollution is measured in decibels (dB)—the louder the noise, the higher the decibels. Decibels can be adjusted to human hearing and are thus described in decibels A (dBA). Prolonged exposure to loud noises (75 dBA over eight hours a day for years) can lead to hearing loss. Even an outdoor noise of 40 dBA can disturb sleep.
Noise immission refers to the reception and exposure to noise generated by an emitting source. In other words, it is the sound input at a given location and how it affects the people in that receiving environment. It is also measured in decibels and is used to assess the noise levels to which a person or community is exposed.
To measure noise levels, a sound level meter (SLM) is typically used. The SLM is held at arm's length at ear height for those exposed to the noise. The microphone does not need to be pointed at the noise source, but the instrument's instruction manual should be consulted for the specific procedure. The SLM must be calibrated before and after each use, and readings can be taken on either SLOW or FAST response. The response rate is the time period over which the instrument averages the sound level before displaying it on the readout. Workplace noise level measurements should be taken on SLOW response. A Type 2 SLM is sufficiently accurate for industrial field evaluations, while Type 1 SLMs are more expensive and primarily used in engineering, laboratory, and research work. Any SLM that is less accurate than a Type 2 should not be used for workplace noise measurement.
Before taking field measurements, it is important to determine the type of information required, including the purpose of the measurement, the sources of noise, the temporal pattern of noise, the locations of exposed persons, and the conditions during both typical and atypical shifts. Initial measurements are noise surveys to determine if a noise problem exists and if further measurements are needed. The second step is to determine personal noise exposure levels; that is, the amount of noise to which individual employees are exposed.
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Effects on humans
Noise pollution is defined as any unwanted sound that impairs or interferes with hearing and is generally caused by humans. Sources of noise pollution include transportation vehicles, motor vehicles, aircraft, and rail activities. Noise pollution can have a range of effects on humans, from mild irritation to more severe health issues.
One of the primary effects of noise pollution on humans is stress and related illnesses. Loud and persistent noise can trigger stress responses in individuals, leading to increased stress hormone levels and potential long-term health consequences. Noise-induced stress has been linked to cardiovascular issues, including heart disease and high blood pressure. It is estimated that chronic noise exposure contributes to a significant number of new cases of heart disease each year in Europe.
Noise pollution can also impact sleep quality and contribute to sleep disturbances and disruptions. This disruption can have flow-on effects on overall health and well-being, including increased fatigue, impaired concentration, and reduced productivity.
Hearing loss and impairment are other significant effects of noise pollution on humans. Exposure to loud noises over time can lead to Noise-Induced Hearing Loss (NIHL), which is the most commonly discussed health effect of noise pollution. Tinnitus and hypersensitivity to sound can also develop due to noise exposure.
Additionally, noise pollution has been linked to cognitive and mental health issues. Research has shown that noise can cause memory impairment, attention deficits, and childhood learning delays. It can also exacerbate existing mental health conditions and contribute to problems such as anxiety and depression.
Noise pollution has been identified as a growing danger to public health, second only to air pollution as the most harmful environmental exposure. While it may be challenging to quantify the exact contribution of noise pollution to health issues, it is clear that it has a range of negative effects on humans, impacting both physical and mental well-being.
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Effects on wildlife
Noise pollution is a human-generated nuisance that interferes with hearing and is caused by transportation vehicles, motor vehicles, aircraft, and rail activities. It has been shown to have adverse effects on wildlife, including:
Hearing Loss: Noise levels of 85 decibels or higher can lead to hearing loss in animals. For example, loud noise can permanently damage the hearing of lab rodents.
Masking: Noise can mask or interfere with important environmental and animal signals. For example, marine animals like whales that depend on sound for communication can be affected by noise, leading to possible strandings.
Increased Heart Rate and Breathing: Noise pollution can cause increased heart rate and breathing in animals, indicating a stress response. This can have further implications for their health and survival.
Behavioral Effects: Noise can alter the behavior of animals, including changes in alertness, foraging behavior, and reproductive strategies. Some birds in noisy environments have taken to singing at night to be heard, while males of at least one frog species are adapting by calling at a higher pitch, which may be less attractive to females.
Physiological Effects: Noise pollution can also have physiological impacts on wildlife, including increased stress levels, fertility problems, and changes in migration routes. It can further cause pain, fear, and cognitive problems in confined animals.
The specific effects of noise pollution on wildlife can vary depending on the species and the characteristics of the noise, such as its frequency, duration, and intensity. More research is needed to fully understand the complex ways in which noise pollution impacts different animal species.
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Effects on aquatic life
Noise pollution is defined as any unwanted sound that impairs or interferes with hearing and is generally caused by humans. Sources of noise pollution include transportation vehicles, motor vehicles, aircraft, and rail activities. This type of pollution has a significant impact on both humans and animals, causing stress, concentration issues, accidents, high blood pressure, speech interference, hearing loss, and sleep disruption.
Aquatic ecosystems, in particular, are vulnerable to the detrimental effects of noise pollution, which can disrupt the natural behaviour of marine mammals and even lead to their death. Marine species heavily rely on sound for their survival, using it to communicate, locate mates and prey, avoid predators, navigate, and defend their territories. Noise pollution in the ocean, primarily caused by ships, seismic surveys, explosions, construction, and sonar devices, has increased dramatically over the past few decades, threatening the natural soundscape and the survival of marine wildlife.
The impact of noise pollution on aquatic life varies across different species and life stages. Invertebrates and fish, for example, are sensitive to particle motion rather than sound pressure. High-intensity noise can cause physical damage to the internal body parts of aquatic animals through vibrations. For instance, in fish, these vibrations can damage the swim bladder, impacting their hearing and buoyancy. Additionally, loud noises can cause immediate hearing loss in marine mammals, which can prove fatal as they depend on sound for survival.
Research has also documented behavioural changes in marine mammals due to noise pollution. They may move away from the noise source, adjust their activities to avoid noisy times, or increase their anti-predatory behaviour. For example, sonar equipment has been shown to alter the feeding behaviour of endangered blue whales, causing them to stop feeding, swim faster, and move away from the sound source. Such behavioural alterations can have significant consequences for the survival and reproductive success of these species.
Noise pollution in aquatic ecosystems has far-reaching effects, impacting a wide range of species and their key life functions. It can cause temporary or permanent hearing loss, physiological changes, masking (where the ability to detect sound is overlapped by another sound), injury, and even death. The complex nature of these impacts, influenced by hearing abilities and noise types, underscores the need for further research to develop effective noise mitigation strategies.
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Frequently asked questions
Noise pollution is any unwanted, loud sound that causes adverse effects, such as hearing loss, communication issues, and headaches. It is caused by humans and can come from transportation, construction, industrial activity, and domestic activities.
The impacts of noise pollution on humans can range from mild irritation to more severe issues such as learning and memory problems, permanent hearing damage, and heart disease. It can also cause stress, hamper concentration, cause sleep disruption, and lead to high blood pressure.
Noise pollution can have various negative impacts on animals, including hearing loss, confusion, and disorientation. It can also affect their migration and mating behaviors. Some animals experience pain, fear, and cognitive problems due to noise.
Noise pollution is typically measured in decibels (dB) using a handheld device or a decibel meter/sound meter. These measurements form the basis of human health guidelines.
