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 ?
Noise assessment methods introduced for the EU Environmental Noise Directive (Common Noise Assessment Methods in EU, CNOSSOS-EU)
Audrey Smargiassi, an associate professor at the University of Montreal who also was unaffiliated with the new study, recently studied associations between socioeconomic status and environmental noise exposures.
It can also be said from this data that the HVAC loudness (shown here in terms of Sones, a metric whose characteristics are closely associated with the subjective impression of HVAC noise levels) can be considered to be a more dominant source of ASR engine disturbance than the environmental noise previously discussed.
Wakefield Acoustics design, manufacture and install industrial and environmental noise control solutions and offers a Total Acoustics Responsibility Service from measurements and assessment to product manufacture, installation and commissioning.
Keeping in view the sheer number of persons exposed to noise, probed in depth the relationship between environmental noise and its effect on health.
The purpose of this study was to determine if the use of music therapy was an effective adjunct to decrease state anxiety while increasing pain management and environmental noise satisfaction in the postoperative patient.
In Section 3, we propose a new algorithm for environmental noise mitigation and show the mitigation results for various target sound powers.
Motor vehicles and especially the road traffic are one of the main sources of environmental noise, which makes a negative impact on the environment and its components (Jagniatinskis et al.
The origins of environmental noise are in human activities and are especially associated with the process of urbanization and the development of transport (Kaklauskas et al.
4) set, designed for general purpose and larger channel count precision acoustic measurements within a variety of applications, including vehicle pass-by noise testing; environmental noise analysis; building acoustics; and appliance and other consumer product noise evaluations.
Collected papers in building acoustics; room acoustics and environmental noise.
They can also be used outdoors for environmental noise control for construction sites and community noise problems.

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