Helena Joyce
Aircraft noise pollution is a significant environmental concern, affecting communities near airports and even those further afield. The noise generated by aircraft can cause annoyance, sleep disruption, and adverse health effects, including potential hearing loss for crew and passengers, and negatively impact children's academic performance. With aviation noise becoming a public issue in the 1960s, governments and aircraft manufacturers have since worked to reduce noise levels through technological advancements and operational procedures. While progress has been made, with modern aircraft being significantly quieter than their predecessors, the challenge of balancing air traffic growth with mitigating noise pollution persists, requiring ongoing innovation and collaboration between authorities, airlines, and community groups.
| Characteristics | Values |
|---|---|
| Definition of noise | "Unwanted sound" |
| Most detrimental environmental effect of aviation | Aircraft noise |
| Impact on communities | Sleep disruption, annoyance, potential hearing loss, increased risk of cardiovascular disease, children's academic performance |
| Impact on air traffic | Noise constrains air traffic growth in some airports |
| Noise levels inside aircraft | Approximately 78 dB(A) during cruise, 65 dB(A) during taxi |
| Noise levels outside aircraft | Modern jet aircraft are 75% quieter than the first models, each new generation has a noise footprint that is at least 15% lower than previous models |
| Legislative controls | FAA Aircraft Certification has achieved "Stage 3" and "Stage 4" noise reductions, leading to quieter aircraft |
| Noise reduction strategies | Source reduction (engine noise, aerodynamic noise), adjusting take-off and landing procedures, sound insulation of dwellings, community engagement |
| Noise reduction targets | ICAO introduced a standard that new aircraft models be at least 7 dB quieter than previous models |
| Noise reduction results | Between 1998 and 2004, a 35% reduction in the number of people exposed to aircraft noise worldwide |
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What You'll Learn
Aircraft noise and its detrimental effects on communities
Aircraft noise is one of the most detrimental environmental effects of aviation. It can cause significant harm to communities, including annoyance, sleep disruption, adverse effects on children's academic performance, and increased health risks. The impact of aircraft noise on surrounding communities has been a growing concern, prompting various measures to mitigate the issue.
Aircraft noise can be a significant source of annoyance and disturbance for residents living near airports. The loud sounds created by aircraft engines, propellers, and rotors can travel long distances and persist for extended periods, affecting the peace and comfort of nearby neighbourhoods. This noise pollution can lead to increased stress levels, irritation, and a decreased quality of life for those within its reach.
One of the most concerning impacts of aircraft noise on communities is the disruption it causes to sleep. The loud and often unpredictable sounds of aircraft can interrupt sleep patterns, resulting in sleep deprivation and fatigue among residents. This issue is particularly pronounced for those living near busy international airports with frequent flight traffic throughout the day and night.
Aircraft noise has also been linked to adverse effects on children's academic performance. Studies have found that exposure to aircraft noise can negatively impact reading comprehension and memory retention. The RANCH study, which examined the effects on 2,844 children aged 9-10 years old near London Heathrow, Amsterdam Schiphol, and Madrid Barajas airports, revealed a correlation between aircraft noise and poorer reading comprehension and recognition memory. A 5 dB increase in aircraft noise exposure was associated with a delay in reading age, highlighting the direct impact of noise pollution on children's educational outcomes.
In addition to the immediate annoyance and disruption caused by aircraft noise, there are also potential long-term health risks associated with prolonged exposure. Research suggests that living in close vicinity to airports and enduring consistent aircraft noise could increase the risk for cardiovascular disease. This indicates that the impact of aircraft noise pollution extends beyond temporary inconvenience and can have serious implications for the health and well-being of community members over time.
Recognising the detrimental effects of aircraft noise on communities, governments and aviation authorities have implemented various measures to mitigate the problem. These include the development of quieter aircraft engines, such as modern high-bypass turbofans, noise-reducing chevrons, and the implementation of noise certification standards by the FAA and ICAO. Additionally, air traffic management plays a crucial role in reducing noise pollution by strategically planning flight tracks that avoid densely populated areas and utilising specific runways for night flights to minimise the impact on residential areas. While progress has been made, there is still a continuous effort to further reduce aircraft noise and protect communities from its harmful effects.
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The impact of aircraft noise on the health and safety of crew and passengers
Aircraft noise pollution refers to noise produced by aircraft in flight, which has been associated with several negative health effects on crew, passengers, and people living near airports. Aircraft noise affects people within the aircraft, including the crew and passengers. Cabin noise can be studied to address the occupational exposure and the health and safety of pilots and flight attendants.
In 1998, a survey of 64 commercial airline pilots found an association between aircraft noise and hearing loss and tinnitus. In 2006, noise levels inside an Airbus A321 during the cruise were reported to be approximately 78 dB(A), exceeding the recommended exposure limit of 85 A-weighted decibels as an 8-hour TWA. Similarly, a 2008 study of Swedish airline cabin crews found average sound levels between 78 and 84 dB(A), with maximum exposure reaching 114 dB. These elevated noise levels can create stress, increase accident rates, and stimulate aggression and other anti-social behaviors.
Aircraft noise has also been linked to various health issues in communities near airports. Studies have found associations between aircraft noise and sleep disturbance, increased risk of cardiovascular disease, and adverse effects on children's cognitive development and academic performance. For example, the RANCH study examined the impact of aircraft noise on 2844 children aged 9-10 years old living near London Heathrow, Amsterdam Schiphol, and Madrid Barajas airports. The study found a correlation between aircraft noise exposure and poorer reading comprehension and recognition memory. Additionally, early studies suggested that children exposed to long-term aircraft noise showed higher annoyance responses and were more likely to give up on difficult tasks.
To mitigate the impact of aircraft noise, governments have enacted legislative controls, and aircraft designers, manufacturers, and operators have developed quieter aircraft and improved operating procedures. For example, modern high-bypass turbofan engines are much quieter than older turbojet engines, and noise-reducing chevrons have been introduced to reduce engine noise further. While these measures have helped reduce noise exposures, more advances are needed to meet the target noise reduction levels and protect the health and safety of crew, passengers, and nearby communities.
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Legislative controls and the development of quieter aircraft
Aircraft noise has been a public issue in the United States since the 1960s, and governments have since enacted legislative controls. Aircraft designers, manufacturers, and operators have been working to develop quieter aircraft and better operating procedures.
In the 1980s, the U.S. Congress authorized the Federal Aviation Administration (FAA) to devise programs to insulate homes near airports. While this does not address external noise, the program has been effective for residential interiors. Some airports where this technology was first applied include San Francisco International Airport and San Jose International Airport in California. The FAA also regulates the maximum noise level that individual civil aircraft can emit through noise certification standards. Aircraft with modern high-bypass turbofan engines, for example, are notably quieter than the turbojets and low-bypass turbofans of the 1960s. FAA Aircraft Certification has achieved noise reductions, with "Stage 3" aircraft being upgraded to "Stage 4" noise certification, resulting in quieter aircraft.
In 2013, the International Civil Aviation Organization (ICAO), the United Nations’ intergovernmental body on aviation, introduced Chapter 14, a new standard in noise reduction. It stipulates that new aircraft models must be at least seven decibels quieter than those built to the previous Chapter 4 standard. This ensures that the quietest technology will be used in future aircraft. The certification was one of several measures to reduce engine noise.
Airports and airlines are also working with local authorities to implement zoning rules in affected areas. Effective land-use planning can discourage or prevent inappropriate new residential, health, or educational developments and instead encourage developments that are not sensitive to aircraft noise, such as light industry or storage areas. In some areas, sound insulation and ventilation are required for new or existing homes to reduce indoor noise levels.
In addition to legislative controls, extensive research has been conducted to examine factors contributing to aircraft noise, such as the amount of air travelling through the engines, the size of the fan blades, the position of the engine on the aircraft body, and the size and number of flaps that help control the wing shape. The latest large aircraft, such as the Boeing 787, Airbus A350, and A380, have remarkably small noise 'footprints'. The A220 makes use of the Pratt & Whitney 'geared' turbofan engines, which further cut noise and emissions. The geared Pratt & Whitney PW1000G also helped reduce the noise levels of the Bombardier CSeries, Mitsubishi MRJ, and Embraer E-Jet E2 crossover narrowbody aircraft.
The Advisory Council for Aviation Research and Innovation in Europe (ACARE)'s FlightPath 2050 vision outlines a target of a 65% reduction in noise emissions by 2050 compared to 2000 levels. This reflects the industry's ongoing commitment to mitigate the environmental impact of aviation noise through technological advancements and strategic research programs.
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Aircraft design and noise-reducing technology
Aircraft noise is one of the most detrimental environmental effects of aviation, causing community annoyance, disrupting sleep, and adversely affecting children's academic performance. Aircraft designers, manufacturers, and operators have been working to develop quieter aircraft and better operating procedures. Here are some key aspects of aircraft design and noise-reducing technology:
Modern High-Bypass Turbofan Engines:
Modern high-bypass turbofan engines are significantly quieter than the older turbojets and low-bypass turbofans used in the 1960s. These engines are also more fuel-efficient. Noise-reducing chevrons further reduce sound levels, and on older engines, hush kits are employed to mitigate excessive noise.
Structural Noise Reduction Technologies:
Aircraft designers use a combination of structural noise reduction technologies and passive methods to minimize sound propagation. This includes the use of acoustic liners within the turbofan bypass duct to absorb and reduce engine noise. Optimization of the shape of the turbofan duct is another approach to reduce noise.
Airframe Noise Reduction:
Airframe noise refers to the sound produced by non-propulsive parts of the aircraft, such as the landing gear, wing slats, and wing flaps. NASA has successfully tested technologies that achieve substantial reductions in airframe noise. This includes treating the landing gear cavity with chevrons and a net to alter airflow, as well as the use of flexible, seamless wing flaps that eliminate gaps, reducing aerodynamic noise.
Rotor-Stator Interaction:
Future engine designs aim to address rotor-stator interaction, a significant mechanism in noise generation. Swept stators reduce fan noise by increasing phase changes and the effective distance from the fan to the stator vanes.
Active Noise Control:
Active Noise Control (ANC) is another field of research in jet engine noise suppression. This technology aims to actively cancel out or reduce unwanted sound waves, improving the overall noise profile of aircraft.
The implementation of these innovative technologies and design optimizations has led to quieter aircraft, improving the quality of life for communities near airports and enabling expanded airport operations.
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Noise reduction procedures and air traffic management
Aircraft noise is one of the most detrimental environmental effects of aviation, causing community annoyance, disrupting sleep, adversely impacting academic performance, and potentially increasing the risk of cardiovascular disease for those living near airports.
Aircraft Design
Aircraft designers, manufacturers, and operators have developed quieter aircraft and better operating procedures. Modern high-bypass turbofan engines, for instance, are significantly quieter than the turbojets and low-bypass turbofans of the 1960s. Aircraft noise can be reduced by optimizing the shape of the nose, windshield, or canopy, as well as the position of the engine on the aircraft body. Additionally, noise-reducing chevrons on newer engines and hush kits on older engines help to reduce engine noise.
Air Traffic Management
Air traffic management plays a crucial role in reducing noise pollution. This includes controlling where planes fly during take-off and landing, as well as the placement and use of runways. For example, planes travelling at night can be directed over seas or lakes to minimize noise impact on populated areas.
Land Use Planning
Land use planning is another important strategy. Governments are encouraged to adopt long-term proactive planning approaches to ensure that future development around airports is not negatively impacted by excessive aircraft noise. This may involve relocating residents living in high-noise areas or installing sound insulation windows in buildings near airports.
Flight Restrictions
Flight restrictions, such as regulating the number of night flights and optimizing flight procedures, can also help reduce noise pollution.
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Frequently asked questions
Sound pollution, or noise pollution, is defined as "unwanted sound". Aircraft noise is considered one of the most detrimental environmental effects of aviation.
Aircraft noise is generated by the flow of air around the aircraft, including the nose, windshield, canopy, wings, rotors, and landing gear. Older aircraft models, such as turbojets and low-bypass turbofans, are particularly noisy. However, modern aircraft engines like high-bypass turbofans are designed to be much quieter and more fuel-efficient. Additionally, the placement and use of runways during take-off and landing can help mitigate noise pollution by directing flights over bodies of water or less populated areas.
Sound pollution from airlines can have several negative impacts on individuals and communities. It can cause annoyance, disrupt sleep, and adversely affect the academic performance of children. Studies have shown that aircraft noise can impair memory and reading comprehension, with similar effects to being intoxicated with a Blood Alcohol Concentration (BAC) level of 0.10. Prolonged exposure to aircraft noise may also increase the risk of cardiovascular disease for people residing near airports.
