noise pollution

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noise pollution,

human-created noise harmful to health or welfare. Transportation vehicles are the worst offenders, with aircraft, railroad stock, trucks, buses, automobiles, and motorcycles all producing excessive noise. Construction equipment, e.g., jackhammers and bulldozers, also produce substantial noise pollution.

Noise intensity is measured in decibeldecibel
, abbr. dB, unit used to measure the loudness of sound. It is one tenth of a bel (named for A. G. Bell), but the larger unit is rarely used. The decibel is a measure of sound intensity as a function of power ratio, with the difference in decibels between two sounds being
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 units. The decibel scale is logarithmic; each 10-decibel increase represents a tenfold increase in noise intensity. Human perception of loudness also conforms to a logarithmic scale; a 10-decibel increase is perceived as roughly a doubling of loudness. Thus, 30 decibels is 10 times more intense than 20 decibels and sounds twice as loud; 40 decibels is 100 times more intense than 20 and sounds 4 times as loud; 80 decibels is 1 million times more intense than 20 and sounds 64 times as loud. Distance diminishes the effective decibel level reaching the ear. Thus, moderate auto traffic at a distance of 100 ft (30 m) rates about 50 decibels. To a driver with a car window open or a pedestrian on the sidewalk, the same traffic rates about 70 decibels; that is, it sounds 4 times louder. At a distance of 2,000 ft (600 m), the noise of a jet takeoff reaches about 110 decibels—approximately the same as an automobile horn only 3 ft (1 m) away.

Subjected to 45 decibels of noise, the average person cannot sleep. At 120 decibels the ear registers pain, but hearing damage begins at a much lower level, about 85 decibels. The duration of the exposure is also important. There is evidence that among young Americans hearing sensitivity is decreasing year by year because of exposure to noise, including excessively amplified music. Apart from hearing loss, such noise can cause lack of sleep, irritability, heartburn, indigestion, ulcers, high blood pressure, and possibly heart disease. One burst of noise, as from a passing truck, is known to alter endocrine, neurological, and cardiovascular functions in many individuals; prolonged or frequent exposure to such noise tends to make the physiological disturbances chronic. In addition, noise-induced stress creates severe tension in daily living and contributes to mental illness.

Noise is recognized as a controllable pollutant that can yield to abatement technology. In the United States the Noise Control Act of 1972 empowered the Environmental Protection Agency to determine the limits of noise required to protect public health and welfare; to set noise emission standards for major sources of noise in the environment, including transportation equipment and facilities, construction equipment, and electrical machinery; and to recommend regulations for controlling aircraft noise and sonic booms. Also in the 1970s, the Occupational Safety and Health Administration began to try to reduce workplace noise. Funding for these efforts and similar local efforts was severely cut in the early 1980s, and enforcement became negligible.

Noise pollution

Noise caused by traffic, car alarms, boom box radios, aircraft, industry or other human activity.

noise pollution

[′nȯiz pə‚lü·shən]
(acoustics)
Excessive noise in the human environment.

noise pollution

annoying or harmful noise in an environment
References in periodicals archive ?
Through the use of the established population-based Border Air Quality Study cohort with state-of-the-art exposure modeling, we were able to efficiently evaluate the effects of proximity to traffic, ambient air pollution, and community noise on the risk of developing RA.
After a beginning chapter on basic principles and definitions, chapters cover sound generation and propagation, instrumentation and measurement, hearing conservation, community noise, and building design criteria.
EPA made the first nationwide assessment of community noise levels in 1974 and estimated that nearly 100 million people lived in areas where daily noise levels were high enough to be annoying and to disrupt many ordinary activities, indoors as well as out.
A community noise roundtable occurred in June for Newark Liberty with another planned this fall, and Teterboro has had a long-standing group to discuss noise concerns for residents in communities surrounding the busy general aviation airport.
Adoption of procurement policies intended to reduce community noise is an opportunity for government to lead by example (Perdue et al.
This ensures construction activities remain within stated compliance limits, while community noise impact is minimised.
This aircraft will be used for a number of tests, including: aerodynamics, high-speed performance, propulsion performance, flight loads, community noise and extended operations (ETOPS) and other test conditions.
The two companies in the past have collaborated to develop performance-based navigation (PBN) procedures, which can help airlines reduce flight time, carbon emissions and community noise on both approach and departure, using GE's flight management systems.
The need to minimise aircraft community noise will remain a top priority not only to secure future airport capacity but for air transport's continued contribution to EU States' economic development.
A link between community noise and mental-health problems is suggested by the demand for tranquilizers and sleeping pills, the incidence of psychiatric symptoms, and the number of admissions to mental hospitals.
GE's flight management system (FMS) provides the ability to fly shorter flight paths and idle-thrust descents which reduces fuel consumption, thereby lowering emissions and community noise levels.
Now WebTrak MyNeighbourhood takes airport community noise engagement up another level.

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