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 ?
The Predictor-LimA Software Suite is a highly advanced system for environmental noise calculation, mapping and analysis.
ASHA is launching a national campaign that includes a series of public service announcements to increase awareness of the damaging affects that environmental noise such as loud music and household appliances can have on long-term hearing health.
Headphones like the Audio-Technica ATH-ANC7b headphones use sophisticated QuietPoint active noise-cancellation technology that detects environmental noise via miniature microphones in each earpiece, and applies a corresponding sound-cancelling signal to block 90% of outside noise.
Contract notice: Service contract supporting the evaluation of Directive 2002/49/EC relating to the assessment and management of environmental noise.
During the conference, taking place on Tuesday 8th October in Birmingham's Crowne Plaza hotel, this particular prize will be awarded to the winner of the Bruel & Kjaer Award for Best Application of Environmental Noise Measurement Data category.
We are excited about revenue possibilities over the near term due to the many new opportunities we foresee in environmental noise management," stated company President Brian Larson.
Voice Controlled Bluetooth([R]) with Sensory's voice control technology Voice prompts assist in easy pairing with phone Voice commands for most tasks including Call Back, Call Voice Mail, Redial Speaks incoming Caller ID - asks to Accept or Reject Call Newest live searching technology available Uses the CSR BC05 chip for faster pairing, improved sound quality and noise handling MAX 4x[TM] Technology blocks 4 times the external environmental noise Compatible with most Bluetooth Enabled Phones Handsfree & wireless Lightweight, fits comfortably on both ears Extra ear gels & hooks included AC & DC chargers included 2 year manufacturer's warranty MSRP: $119.
The regular updating of noise maps using a standardised approach is required by the Environmental Noise Directive (END).
com)-- Evaluating noise from construction sites has never been simpler with Bruel & Kjaer's environmental noise calculation software, Predictor-LimA Type 7810.
FAA RELEASES DRAFT NEW JERSEY ENVIRONMENTAL NOISE IMPACT STATEMENT
With automatic volume adjustment feature which fine-tunes to environmental noise caused by speed, the BlueAnt Interphone device enables excellent performance in speeds of up to 80mph.
The Maryland Environmental Noise Act requires the Maryland Aviation Administration (M) to minimize the impact of aircraft related noise on people living near BWI Marshall.

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