Greta Jimenez
Noise pollution is unwanted or excessive sound that can have detrimental effects on human health, wildlife, and environmental quality. It is commonly generated in industrial facilities, workplaces, and traffic. Noise pollution can cause physical damage to the eardrum and inner ear, leading to temporary or permanent hearing loss. It also raises blood pressure, disrupts sleep, and causes irritability and anxiety. To measure noise levels, sound level meters or smartphone decibel meter apps can be used. These tools help identify noise pollution sources and classify them into levels of annoyance. By understanding noise levels, individuals can take steps to reduce exposure and protect their health.
| Characteristics | Values |
|---|---|
| Unit of measurement | Decibels (dB) |
| dB range detectable by the human ear | 0 dB (hearing threshold) to 140 dB (pain threshold) |
| dB level considered noise pollution by the WHO | >65 dB |
| dB level considered harmful by the WHO | >75 dB |
| Noise sources | Industrial facilities, workplaces, highway, railway, and airplane traffic, outdoor construction activities |
| Effects on humans | Hearing loss, raised blood pressure, sleep issues, stress, headaches, etc. |
| Effects on wildlife | Interference with mating, communication, navigation, finding food, etc. |
| Ways to reduce exposure | Wear hearing protection, use the 60:60 rule for headphones, avoid noisy activities, etc. |
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What You'll Learn
Use a sound level meter to measure noise levels
Sound level meters (SLMs) are commonly used to quantify different kinds of noise, especially in industrial, environmental, mining, and aircraft contexts. They are also used to measure noise from road and rail traffic, construction work, and typical urban situations like concerts, leisure parks, and residential and commercial areas.
To measure noise levels using an SLM, follow these steps:
- Purchase a Class 1 or Class 2 SLM. Class 1 meters are more accurate and suitable for detailed acoustic measurements, while Class 2 meters are slightly less accurate but still appropriate for general sound level measurements.
- Calibrate your SLM according to the manufacturer's instructions. Calibration is necessary to ensure precise and reliable measurements for regulatory compliance.
- Hold the SLM straight in front of you at ear level.
- Turn on the SLM. Some basic models will automatically start measuring, while others may require you to press an additional button to start the measurement.
- Read the number on the display screen to get the sound pressure level in decibels (dB). The reading will be updated at least once per second.
- If needed, use an A-weighting filter to modify the reading based on audio frequency, compensating for how the human ear perceives sound. This modified reading is known as A-weighted decibels (dBA).
Alternatively, you can use a smartphone app to measure sound levels. Several options are available for both Android and iOS devices, such as SPL Meter, Decibel X, and Too Noisy Pro. The National Institute for Occupational Safety and Health (NIOSH) also offers a free app for iOS devices that combines the features of professional SLMs and noise dosimeters. These apps can be useful for quickly assessing sound levels in various environments.
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Understand the decibel (dB) scale
The decibel (dB) is a unit of measurement for sound intensity. It expresses the ratio of two values of a physical quantity, typically power or intensity. One decibel is one-tenth of one bel, a unit named after Alexander Graham Bell. Decibels are measured using a decibel meter, which uses the sensitivity of the microphone to convert electrical signals to sound pressure. This device is useful for measuring noise in noise pollution studies.
The decibel scale is nonlinear, meaning that loudness is not directly proportional to sound intensity. Instead, sound intensity increases very rapidly. For example, a sound at 20 dB is 10 times more intense than a sound at 10 dB and is perceived as twice as loud.
The decibel scale is important for understanding noise pollution and its potential impact on health. Sounds at or below 70 dB are considered safe for hearing. This includes the sound of a normal conversation, which is typically around 60 dB. Sounds at 80 or 85 dB can damage your hearing over time, and prolonged exposure to sounds above 85 dB can lead to hearing loss. Eight hours of exposure to sounds measuring 90 dB can damage the human ear, and exposure to 140 dB can cause immediate damage and pain.
To protect your hearing, it is recommended to carry earplugs, turn down the volume, and take quiet breaks to rest your ears. Many sound level meter apps are available for smartphones that can measure decibels and send alerts when noise levels are too high.
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Identify sources of noise pollution
Noise pollution, also known as sound pollution, is the propagation of noise or sound with potentially harmful effects on humans, animals, and the environment. It is commonly generated in industrial facilities and some other workplaces, but it also comes from road, rail, and air traffic, as well as construction activities.
There are two main sources of noise pollution: industrial and non-industrial. Industrial sources include noise from large machines working at high speed and high noise intensity. This includes machines and equipment used in construction, such as jackhammers, as well as fans, motors, and compressors mounted on industrial buildings. The construction of highways, city streets, and buildings is a major contributor to noise and air pollution in cities.
Non-industrial sources of noise pollution include transportation and vehicular traffic, such as cars, trucks, buses, motorcycles, and airplanes. In cities, the main sources of traffic noise are often the motors and exhaust systems of vehicles. Locomotive engines, horns, whistles, and operations in rail yards are also sources of noise pollution.
Noise pollution can also come from neighbourhood activities, such as loud music, lawn care maintenance, electrical generators, wind turbines, and explosions. Religious celebrations, including fireworks and honking during pilgrimages, can also contribute to noise pollution.
Underwater noise pollution is another significant issue, affecting marine life such as whales, fish, and invertebrates. It is caused by ship noise, oil drilling, sonar equipment, seismic testing, and underwater explosions.
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Understand the health effects of noise pollution
Noise pollution is unwanted or excessive sound that can have harmful effects on human health, wildlife, and environmental quality. It is commonly generated inside many industrial facilities and some other workplaces, but it also comes from highway, railway, and airplane traffic, as well as outdoor construction activities.
Noise exposure is a major public health threat affecting both physical and mental health. The World Health Organization (WHO) and the European Environment Agency (EEA) have reported that noise exposure is a significant public health threat, with at least 20% of the urban population in the European Union affected by the harmful effects of road traffic noise.
Noise pollution can cause physical damage to the eardrum and the sensitive hair cells of the inner ear, resulting in temporary or permanent hearing loss, known as noise-induced hearing loss (NIHL). Hearing loss usually occurs at SPLs above 80 dBA, and exposure levels above 85 dBA for eight hours are not recommended. Most people exposed to more than 105 dBA will experience some degree of permanent hearing loss.
In addition to causing hearing loss, excessive noise exposure has been linked to various adverse health effects, including raised blood pressure and pulse rates, irritability, anxiety, mental fatigue, stress, sleep disturbances, and interference with communication, recreation, and personal communication. It can also lead to cardiovascular disease, type 2 diabetes, childhood learning delays, low birth weight, and cognitive problems such as memory impairment and attention deficits.
Children are particularly vulnerable to the effects of noise pollution, which may cause stress, memory impairment, and attention problems. Furthermore, noise pollution can impact wildlife, interfering with their ability to attract mates, communicate, navigate, find food, or avoid predators. This can even pose an existential threat to vulnerable organisms, especially marine animals that rely on echolocation, such as certain whales and dolphins.
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Take measures to reduce noise exposure
Noise pollution, which is commonly generated in industrial facilities and some other workplaces, can have a range of negative effects on human health, including hearing loss, sleep issues, raised blood pressure, and stress. It can also impact wildlife, including marine animals, and environmental quality.
To reduce noise exposure, here are some measures that can be taken:
Use Hearing Protection
Wearing hearing protection devices, such as earplugs or earmuffs, can help reduce noise exposure by blocking or reducing the sound entering the ear canal. These devices can be purchased or provided by employers as part of hearing conservation programs.
Modify or Replace Equipment
Replacing old machinery and tools with quieter alternatives can significantly reduce noise levels. When purchasing new equipment, compare noise levels and choose options with lower noise emissions. Simple engineering noise control solutions, such as modifying or retrofitting equipment, can also help minimize noise exposure.
Limit Time in Noisy Areas
Reducing the amount of time spent in noisy areas is an effective way to decrease noise exposure. Proper workflow design should aim to keep noisy machinery away from areas where people spend most of their time. Limiting worker exposure to loud noises can be achieved by implementing time restrictions or rotating workers to minimize their time in high-noise areas.
Maintain Machinery and Equipment
Regular maintenance of machinery and equipment is essential to prevent them from becoming noisier over time due to deterioration. Proper maintenance can help identify and address potential issues, ensuring that noise levels are kept as low as possible.
Implement Engineering Controls
Engineering controls involve making physical changes to the noise source or its transmission path to reduce the noise level reaching the worker's ear. This can include enclosing or isolating the noise source, adding sound-absorbing materials, or using noise barriers and enclosures. These controls aim to eliminate or minimize the risk to hearing health.
By taking these measures, individuals and organizations can play a crucial role in reducing noise exposure, thereby mitigating the negative impacts of noise pollution on human health and the environment.
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Frequently asked questions
Noise pollution is unwanted or excessive sound that can have harmful effects on human health, wildlife, and environmental quality. You can check for noise pollution in your surroundings by using a sound level meter, which consists of a sound sensor attached to a device that measures sound intensity in decibels (dB). Decibels are a unit used to express the intensity of a sound wave, with a 10-point increase representing a 10-fold increase in noise level. According to the World Health Organization (WHO), noise becomes harmful when it exceeds 75 dB, and painful above 120 dB.
Noise pollution can have several negative impacts on human health, including hearing loss, sleep issues, raised blood pressure and pulse rates, irritability, anxiety, mental fatigue, and interference with communication and recreation. It is important to address and reduce exposure to noise pollution to prevent these health issues.
To reduce your exposure to noise pollution, you can take several measures such as wearing hearing protection or earplugs, opting for quieter means of transportation, insulating your home with noise-absorbing materials, and avoiding noisy leisure activities. Additionally, you can support government initiatives that protect certain areas from noise pollution and establish regulations for noise management.
