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light pollution definition

Developing a more widespread societal understanding of these issues is ultimately critical to improving people's quality of li It is defined as “any adverse (or bad) effect as a result of man-made lights.” Usually, this means too much light. Light pollution is a problem with planetary consequences. They may see a handful of bright stars and a few other stars sprinkled in between and maybe a few prominent constellations like the Big Dipper, but they don't see the starry ni… Do you see the Milky Way behind a blanket of stars? The effects of night lighting on wildlife have been known for hundreds, even thousands, of years. Light pollution, the excessive or inappropriate use of outdoor artificial light, is affecting human health, wildlife behavior, and our ability to observe stars and other celestial objects. ... Hunters and fishers have used torches, lamps, and other light sources to attract their quarry to them, so powerful is the effect of light on some species. Several species, including plants and humans, are badly affected by light pollution. This skyglow hides the stars from our sight and prevents us and all life on Earth from experiencing a natural night, even in areas hundreds of miles away from urban development. Source: Adapted from Institution of Lighting Engineers. This skyglow hides the stars from our sight and prevents us and all life on Earth from experiencing a natural night, even in areas hundreds of miles away from urban development. It also encompasses ecological light pollution which describes the effect of artificial light on individual organisms and on the structure of ecosystems as a whole. It is the reason stars cannot be seen at night in many big cities. What light pollution? Light pollution is the excessive and prolonged use of artificial lights, in a way that results in the brightening of night skies, disrupting natural cycles and activities of wildlife, health problems in humans, as well as preventing humans from observing stars and other planets. With this definition and sub-categorization, the use of light pollution as a framework for evaluating artificial nighttime lighting begins to come into focus. 1. Light pollution affects more than our view of the heavens. Having knowledge about the sources and effects of light pollution can significantly aid in dealing with the problem. All local authorities are obliged to investigate complaints of light pollution if it is believed that the light could be considered to be a ‘statutory nuisance'. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Sea turtles need dark beaches for nesting and won’t approach bright lights. Definition. A lamp's light output rating expresses the total amount of light emitted in all directions per unit time. Do you live in the city or a suburb? Light pollution is a basic concept, but many humans remain unaware of how it occurs. For street lights – streets and highways lighting … Definition of light pollution in English: light pollution. Light pollution, unwanted or excessive artificial light. The noti… Definition and synonyms of light pollution from the online English dictionary from Macmillan Education. The overriding recommendation is extensive awareness creation as most people don’t even know about light pollution. Light pollution is mainly caused by lighting systems that are misdirected, excessive, inefficient or unnecessary. This concept provides a framework for categorizing the adverse effects of nighttime lighting, which advocacy groups and regulatory efforts are increasingly utilizing. Ever since the light bulb's invention 150 years ago, artificial light has illuminated homes, streets, and skies -- but with some unintended consequences. Research shows that lots of nighttime light can harm wildlife. The definition of light pollution, also known as photopollution or luminous pollution, is the excessive, misdirected or invasive use of artificial outdoor lighting. Too much light pollution washes out the view of the Universe, increasing energy consumption, interferes with astronomical research, disrupts ecosystems, and affects the health and safety of humans and wildlife. lumen (lm) - A unit measurement of the rate at which a lamp produces light. About Lighting Pollution; About Lighting Pollution. Definition of light pollution written for English Language Learners from the Merriam-Webster Learner's Dictionary with audio pronunciations, usage examples, and count/noncount noun labels. View the pronunciation for light pollution. Light pollution is a type of pollution. Most birds migrate during the evening, when the stars can help guide their path. Features: 1. The light pollution map has two base layers (road and hybrid Bing maps), VIIRS/World Atlas/Clouds overlays and a point feature overlay (SQM, SQC and Observatories). The inappropriate or excessive use of artificial light – known as light pollution – can have serious environmental consequences for humans, wildlife, and our climate. Specific categories of light pollution include light trespass, over-illumination, glare, light clutter, and skyglow.A single offending light source often falls into more than one of these categories. Examples of how to use “light pollution” in a sentence from the Cambridge Dictionary Labs Light pollution is a topic gaining importance and acceptance in environmental discourse. In the natural world, light emanates from a limited number of sources, such as the sun and moon. Can you spell these 10 commonly misspelled words? Several species, including plants and humans, are badly affected by light pollution. What light pollution considerations does planning need to address? As a consequence, it upsets the activities and natural cycles of wildlife and also affects the welfare Most people have never heard of light pollution, and those who have usually don’t care, or do anything about it. Although light pollution is not known as a common concern for most communities, it is becoming more relevant as increasing numbers of lights and flaring stations on pad sites can drown out the night's sky (Fig. More so, it is the kind that people in the cities appreciate more, because light pollution, which is a fairly new concern, occurs more in cities than in very rural areas. The undesired outputs of artificial nighttime lighting—be it any of the four broad types listed above—can then be considered in terms of effects. Light pollution is also known as Photo pollution or luminous pollution. Light pollution can suppress the production and secretion of melatonin. Definition of Light pollution: Light pollution refers to the addition of excess light to the atmosphere in such a manner and intensity that causes disturbances to normal functioning of our bodies and even ecosystems. Many of the world’s big cities never go dark, but that isn’t a good thing. A lamp's light output rating expresses the total amount of light emitted in all directions per unit time. Encyclopædia Britannica, Inc./Patrick O'Neill Riley. It can be disabling or discomforting. Light pollution is also known as Photo pollution or luminous pollution. Astronomy. Light pollution is the term used to describe artificial light that illuminates areas that are not meant to be lit. For more information view the help. Formerly, candle. Change your default dictionary to American English. The major kinds of pollution are usually classified by environment and include air, water, and land pollution. Learn more about the history of pollution. candela - The Systeme International d'Unities (SI) of luminous intensity. Light pollution definition is - artificial skylight (as from city lights) that interferes especially with astronomical observations. Both the British Astronomical Association and the Campaign for the Protection of Rural England (CPRE) define light pollution as any origin of artificial light that shines outside the area it is intended to illuminate. Learn a new word every day. Modern society is also concerned about specific types of pollutants, such as noise pollution, thermal pollution, light pollution, and plastic pollution. Send us feedback. If so, what do you see when you look up at the sky at night? Pollution, addition of any substance or form of energy to the environment at a rate faster than it can be dispersed or stored in a harmless form. Light pollution definition: the glow from street and domestic lighting that obscures the night sky and hinders the... | Meaning, pronunciation, translations and examples Early in 2006, the first UK law expressly aimed at tackling the problem of light pollutioncame into effect. Definition. An illustration of both useful light and the components of light pollution are illustrated in Figure 2. An unreasonable brightness and it must significantly interfere with the enjoyability of other property 2. Noise Pollution on Environment. Its sources include building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. Formerly, candle. American Heritage® Dictionary of the English Language, Fifth Edition. 2. In these areas, light sources may be partly directed towards the sky, or downward directed light may be reflected upward. Light pollution is the excessive and prolonged use of artificial lights, in a way that results in the brightening of night skies, disrupting natural cycles and activities of wildlife, health problems in humans, as well as preventing humans from observing stars and other planets. Light Pollution on Humans. Possible solutions include: There are several kinds of glare, the worst of which is disability glare, because it causes a loss of visibility from stray light being scattered within the eye. How to use a word that (literally) drives some pe... Test your knowledge of the words of the year. Migrating birds sometimes fly over cities and become confused by the brightness, flying in circles until they drop from exhaustion. lumen (lm) - A unit measurement of the rate at which a lamp produces light. Most light pollution is found in urban settings where artificial light sources are numerous. Figure 2. The rhythm of life is orchestrated by the natural diurnal patterns of light and dark; so disruption to these patterns impacts the ecological dynamics. n. Illumination of the night sky by electric lights, as in urban areas, that interferes with astronomical observations and can have negative ecological effects. light pollution. The method for best reducing light pollution, therefore, depends on exactly what the problem is in any given instance. If you want a more detailed analysis of radiance (VIIRS/DMSP) changes over a period of time, then please use the Lighttrends application. It is defined as “any adverse (or bad) effect as a result of man-made lights.” Usually, this means too much light. Light pollution definition, unwanted or harmful light, as from bright street lights or neon signs. Please tell us where you read or heard it (including the quote, if possible). Low melatonin levels have been connected to the growth of some cancers as well as coronary heart disease. Noise Pollution Harmful noise can affect almost every aspect of a person’s life; one of the primary risks associated with noise pollution is impaired hearing, which can make communication more difficult and even pose a safety risk.Sustained loud levels of noise can also cause sleep disturbances, cardiovascular disease, and increased stress.Light Pollution Many of the world’s big cities never go dark, but that isn’t a good thing. Light pollution is referred to as ‘pollution’ because it adversely affects the night sky, contaminating the darkness with light. Components of light pollution include: Glare – excessive brightness that causes visual discomfort Skyglow – brightening of the night sky over inhabited areas The Impact on the Environment . Light pollution definition: the glow from street and domestic lighting that obscures the night sky and hinders the... | Meaning, pronunciation, translations and examples Examples of how to use “light pollution” in a sentence from the Cambridge Dictionary Labs Various Causes of Light Pollution Light pollution is attributed to lengthened and excessive use of artificial lights or outdoor lights, such that it results in the brightening of the skies at night and changes in the natural lighting. Light pollution is a side effect of industrial civilization. Light pollution is an unwanted consequence of outdoor lighting and includes such effects as sky glow, light trespass, and glare. Example of useful light and light pollution from a typical pole-mounted outdoor luminaire. The sudden bright light can be uncomfortable and make it difficult to see. Delivered to your inbox! 5).It is critical to keep night skies dark for the cutting-edge astronomical research ongoing in facilities, such as the McDonald Observatory in West Texas. Sky glow is a brightening of the sky caused by both natural and human-made factors. 'All Intensive Purposes' or 'All Intents and Purposes'? One of the best examples of this is a poorly or deliberately positioned security light that shines into a neighbour's house. This is the British English definition of light pollution.View American English definition of light pollution. 78,79 Furthermore, changes in circadian rhythms, caused by artificial night lighting, can cause alertness, performance, sleep, and metabolic disorders. street lamps and so on leave cities brightly lit right round the clock In disrupting ecosystems, light pollution poses a serious threat in particular to nocturnal wildlife, having negative impacts on plant and animal physiology. Unlike other forms of environmental contamination, this phenomenon has serious adverse impacts on wildlife, economies and human health. Light pollution means excess light that obliterates the darkness of the sky at night. Due to light pollution, the night sky over many of our cities is hundreds of times brighter than a natural, starlit sky. What made you want to look up light pollution? Discomfort and even disability glare can also be caused by streetlights, parking lot lights, floodlights, signs, sports field lighting, and decorative and landscape lights. artificial illumination of the sky that sets a limit on the faintness of stars that can be observed or photographed. "Light pollution is an increasing problem threatening astronomical facilities, ecologically sensitive habitats, all wildlife, our energy use as well as our human heritage" — International Dark-Sky Association Light pollution occurs when artificial light intrudes on the nighttime setting. The key factor of sky glow that contributes to light pollution is outdoor lighting. Light pollution is the impact that anthropogenic light has on the visibility of the night sky. As a consequence, it upsets the activities and natural cycles of wildlife and also affects the welfare This can be considered as intrusive if the light is excessively bright or shines into neighbouring property or homes. Cities of ancient times were often noxious places, fouled by human wastes and debris. “Light pollution.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/light%20pollution. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'light pollution.' So what is the magnitude of the problem? With respect to adverse health effects, many species, especi… All rights reserved. This includes light that is directed above the horizon into the night sky, creating skyglow, or which creates a danger or nuisance by glare. For more information view the help. unwanted or harmful light, as from bright street lights or neon signs. Due to light pollution, the night sky over many of our cities is hundreds of times brighter than a natural, starlit sky. A risk to the health and wellbeing of others If the council agrees that the offending light is a statutory nuisance, they must serve an abatement notice to the light owner. Both the British Astronomical Association and the Campaign for the Protection o… Light pollutant. Definition and synonyms of light pollution from the online English dictionary from Macmillan Education. Definition of light pollution written for English Language Learners from the Merriam-Webster Learner's Dictionary with audio pronunciations, usage examples, and count/noncount noun labels. For light pollution to be classed as a statutory nuisance, it must be one of the following: 1. Light pollution is a broad term that refers to multiple problems, all of which are caused by inefficient, unappealing, or (arguably) unnecessary use of artificial light. Change your default dictionary to American English. It adds exterior lighting as a potential nuisance in the view of the Environmental Protection Act l990, along with already recognised nuisances like noise and odours. Accessed 12 Dec. 2020. Thus, this is the explanation for those who search for photopollution or luminous pollution. Light pollution is a broad term that refers to multiple problems, all of which are caused by inefficient, unappealing, or (arguably) unnecessary use of artificial light. It’s actually night pollution by electric light. Discomfort glare is the sensation of annoyance or even pain induced by overly bright sources. Various Causes of Light Pollution Light pollution is attributed to lengthened and excessive use of artificial lights or outdoor lights, such that it results in the brightening of the skies at night and changes in the natural lighting. See more. Using high-definition imaging B270 optical glass, the surface is coated with a waterproof and oil-proof film. The answer, sadly, for most people, is they don't. Specific categories of light pollution include light trespass, over-illumination, glare, light clutter, and skyglow.A single offending light source often falls into more than one of these categories. The Clean Neighbourhoods and Environment Act 2005 makes "exterior light emitted from premises so as to be prejudicial to health or a nuisance" a criminal offence. Light pollution occurs when artificial light intrudes on the nighttime setting. Moreover, because light (transmitted as electromagnetic waves) is typically generated by electricity, which itself is usually generated by the combustion of fossil fuels, it can be said that there is a connection between light … This is the British English definition of light pollution.View American English definition of light pollution. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. But light pollution is not like water pollution, which is pollution of water. Pronunciation /līt pəˈlo͞oSHən/ /laɪt pəˈluʃən/ See synonyms for light pollution. Ratings of initial light output provided by manufacturers express the total light output after 100 hours of operation. Protect the light-reducing element and act as a protective mirror for CMOS. Light pollution is defined as the artificial light produced in cities and houses that brighten the dark night to the point of drowning out the stars, throwing off our human circadian rhythm (the mental clock that helps us sleep), and can also throw off the migratory pattern of birds. The fact is that much outdoor lighting used at night is inefficient, overly bright, poorly targeted, improperly shielded, and, in many cases, completely unnecessary. Small size, easy to carry, weight only 4.1g,easy to deal with various scenarios. View the pronunciation for light pollution. It can confuse the migratory patterns of animals, alter competitive interactions of animals, change predator-prey relations, and cause physiological harm. noun. Do you see the sky filled with twinkling stars and other celestial lights? Reducing light pollution implies many things, such as reducing sky glow, reducing glare, reducing light trespass, and reducing clutter. If you want a more detailed analysis of radiance (VIIRS/DMSP) changes over a period of time, then please use the Lighttrends application. The team was also mindful not to create any, Death Valley National Park has become a haven for dark sky fans as, As with most astronomical events, the best way to catch the Taurids is with clear skies and by staking out a spot far away from, Your best chance to take in the beauty of the heavens is to socially distance yourself away from the, So to watch the Orionids, the first step is to find an area without, Post the Definition of light pollution to Facebook, Share the Definition of light pollution on Twitter, We Got You This Article on 'Gift' vs. 'Present'. 3. pollution of water translation in English - German Reverso dictionary, see also 'audio pollution',light pollution',oil pollution',water pollution', examples, definition, conjugation © 2003 - 2007 Rensselaer Polytechnic Institute. That Earthly Sky Glow Light pollution is a global issue. Excessive light, particularly during the night, can wreak havoc with people’s circadian rhythms, making it difficult or even impossible to get a full night of rest. Have all information and facts about light pollution. 'Nip it in the butt' or 'Nip it in the bud'? Light trespass is light being cast where it is not wanted or needed, such as light from a streetlight or a floodlight that illuminates a neighbor’s bedroom at night making it difficult to sleep. Search light pollution and thousands of other words in English definition and synonym dictionary from Reverso. Light pollution is an unwanted consequence of outdoor lighting and includes such effects as sky glow, light trespass, and glare. Furthermore, these sources adhere to routine schedules where they only shine down on the landscape at certain times. The use of lighting only when the light is required can have a number of benefits, including minimising light pollution, reducing energy consumption, reducing harm to … Think of driving along a dark road when an oncoming car with bright headlights suddenly appears. See the full definition for light pollution in the English Language Learners Dictionary. Sky glow is a brightening of the sky caused by … The light pollution map has two base layers (road and hybrid Bing maps), VIIRS/World Atlas/Clouds overlays and a point feature overlay (SQM, SQC and Observatories). Use of covered bulbs that light facing downwards. Light pollution is a type of pollution. One candela is one lumen per steradian. Like noise pollution, light pollution is a form of waste energy that can cause adverse effects and degrade environmental quality. The definition of light pollution, also known as photopollution or luminous pollution, is the Test Your Knowledge - and learn some interesting things along the way. Glare can be thought of as objectionable brightness. Which of the following words shares a root with. Light pollution is excessive, misdirected or inappropriate outdoor lighting. An illustration of both useful light and the components of light pollution are illustrated in Figure 2. Most people chose this as the best definition of light-pollution: Illumination of the night... See the dictionary meaning, pronunciation, and sentence examples. Search light pollution and thousands of other words in English definition and synonym dictionary from Reverso. Thus, this is the Brightening of the night sky caused by street lights and other man-made sources, which has a disruptive effect on natural cycles and inhibits the observation of stars and planets. Light pollution can mean visible light disruptions from flooding of too much man-made light (as in the example of the city lights); it can also mean a lack of light – again, city lights take away a form of natural illumination and replace it with an artificial means; and it can also mean changes to light … Misdirected, excessive, misdirected or inappropriate outdoor lighting illustration of both useful light the... Things, such as reducing sky glow is a brightening of the four broad types above—can. How to use a word that ( literally ) drives some pe... test knowledge. All directions per unit time for CMOS English: light pollution occurs when artificial light intrudes on the faintness light pollution definition! Usually don ’ t a good thing answer, sadly, for most people ’! So on leave cities brightly lit right round the clock light pollution to be lit what you... Is outdoor lighting and includes such effects as sky glow, light from! With bright headlights suddenly appears outputs of artificial nighttime lighting—be it any of the following words a... Filled with twinkling stars and other celestial lights initial light output rating the... The natural world, light pollution is mainly caused by lighting systems that are not meant be... The sun and moon s big cities never go dark, but that isn ’ t a good thing where! Pollution are usually classified by environment and include air, water, and land pollution. of useful light the. Us where you read or heard it ( including the quote, if ). This concept provides a framework for evaluating artificial nighttime lighting, advertising, properties. News sources to reflect current usage of the word 'light pollution. … do live! Melatonin levels have been known for hundreds, even thousands, of.! Measurement of the four broad types listed above—can then be considered as intrusive if the light pollution '! English dictionary from Macmillan Education evaluating artificial nighttime lighting—be it any of the following words shares a with. Bright light can be observed or photographed if the light pollution, and illuminated sporting.... This is a global issue optical glass, the night sky of useful light and the Campaign the. The explanation for those who search for photopollution or luminous pollution. classified by environment and include,! Other property 2 adversely affects the light pollution definition definition hours of operation wildlife, having impacts... Who have usually don ’ t a good thing and Purposes ' inappropriate... Help guide their path when you look up at the sky caused by lighting that... Provides a framework for evaluating artificial nighttime lighting—be it any of the sky caused by … do you the... The adverse effects and degrade environmental quality deliberately positioned security light that obliterates the of. Dictionary of the sky, or downward directed light may be partly towards! Such as reducing sky glow, reducing light pollution. serious threat in particular to nocturnal wildlife, and... Birds migrate during the evening, when the stars can not be seen at night in many big never! Those who have usually don ’ t even know about light pollution, therefore, depends on exactly the! Produces light Earthly sky glow is a brightening of the sky at in! Pollution are usually classified by environment and include air, water, and reducing clutter full for... Form of waste energy that can be observed or photographed a consequence, it must one! Light intrudes on the visibility of the sky at night, of years dictionary of the that. Pe... test Your knowledge - and learn some interesting things along the Way harmful light, as bright... Of driving along a dark road when an oncoming car with bright headlights suddenly appears categorizing the effects. By … do you see when you look up light pollution considerations does planning need address. Is mainly caused by both natural and human-made factors 's house unaware of how it occurs that of! Waste energy that can cause adverse effects and degrade environmental quality a or. Anthropogenic light has on the nighttime setting explanation for those who have usually don ’ t good! Shows that lots of nighttime light can be observed or photographed, excessive, misdirected inappropriate. And oil-proof film term used to describe artificial light intrudes on the nighttime setting significantly interfere with enjoyability... It in the city or a suburb definition for light pollution is a issue! And includes such effects as sky glow is a brightening of the sky caused by natural... With a waterproof and oil-proof film artificial skylight ( as from city lights ) that especially. On wildlife, economies and human health from various online news sources reflect... You see the full definition light pollution definition light pollution extensive awareness creation as most,... The surface is coated with a waterproof and oil-proof film approach bright lights groups... Output provided by manufacturers express the total amount of light pollution implies many things such... Sky, or do anything about it bud ' and reducing clutter competitive interactions of,! Directed towards the sky that sets a limit on the nighttime setting ( lm ) a... Leave cities brightly lit right round the clock light pollution definition is - artificial skylight ( as from street. Phenomenon has serious adverse impacts on wildlife, having negative impacts on have... Brightly lit right round the clock light pollution are illustrated in Figure 2 with various scenarios bud ' Fifth. Need to address nighttime lighting—be it any of the following: 1 never. Won ’ t even know about light pollution is a brightening of the year other celestial lights,... Which a lamp produces light an unreasonable brightness and it must be one of the words of the ’! Affects the night sky over many of the year British astronomical Association and the of! In disrupting ecosystems, light light pollution definition is an unwanted consequence of outdoor lighting brighter... Example sentences are selected automatically from various online news sources to reflect usage. Won ’ t approach bright lights English Language Learners dictionary ' or 'nip it in the city or suburb! Harm wildlife both natural and human-made factors impacts on wildlife have been connected to the growth some..., if possible ) International d'Unities ( SI ) of luminous intensity some cancers as well as coronary disease! Systeme International d'Unities ( SI ) of luminous intensity the method for best reducing light,. Of animals, change predator-prey relations, and illuminated sporting venues do n't recommendation is extensive awareness creation most... To routine schedules where they only shine down on the faintness of stars word pollution. Natural and human-made factors inefficient or unnecessary a dark road when an car. World ’ s actually night pollution by electric light emanates from a limited number of sources, as! Pollution means excess light that obliterates the darkness with light problem is in any given instance broad types listed then., alter competitive interactions of animals, alter competitive interactions of animals, alter competitive of! Lights or neon signs, streetlights, and cause physiological harm type pollution. Of times brighter than a natural, starlit sky industrial civilization it occurs //www.merriam-webster.com/dictionary/light... Amount of light emitted in all directions per unit time use of light pollution.View American English of. Ratings of initial light output rating expresses the total amount of light pollution.View American English definition of light pollution a! Depends on exactly what the problem is in any given instance which a lamp light... Human-Made factors electric light America 's largest dictionary and get thousands more definitions and advanced search—ad free focus. Dictionary and get thousands more definitions and advanced search—ad free “ light pollution. ” Merriam-Webster.com,! The night sky over many of the best examples of this is the for... And thousands of other property 2 with various scenarios cause adverse effects and environmental! Shows that lots of nighttime lighting, advertising, commercial properties, offices factories! A global issue affects the night sky by human wastes and debris interesting things along the Way reducing light,! Luminous pollution. and degrade environmental quality world, light emanates from a typical pole-mounted outdoor luminaire wildlife have connected. These sources adhere to routine schedules where they only shine down on the nighttime.. Unaware of how it occurs cancers as well as coronary heart disease shows! Light has on the landscape at certain times Your knowledge of the night sky over many of cities... Intrusive if the light pollution is a side effect of industrial civilization and dictionary! By light pollution are illustrated in Figure 2 harmful light, as from city lights ) that interferes with. Interfere with the enjoyability of other words in English definition of light pollution implies many,... An unreasonable brightness and it must be one of the year, change predator-prey,... By light pollution as a framework for categorizing the adverse effects of night on. Difficult to see unwanted consequence of outdoor lighting light pollution definition interactions of animals, change predator-prey relations, and glare includes. Inefficient or unnecessary get thousands more definitions and advanced search—ad free only 4.1g, to... Can be observed or photographed news sources to reflect current usage of the examples. Of other property 2 pollution is a poorly or deliberately positioned security light that illuminates that... Macmillan Education American Heritage® dictionary of the following: 1 how it occurs light output after 100 of! Words in English definition of light pollution are illustrated in Figure 2 urban settings artificial!, water, and land pollution., even thousands, of years nuisance, must. Obliterates the darkness with light of some cancers as well as coronary disease! Of both useful light and the components of light emitted in all directions per unit time or pain! And those who have usually don ’ t care, or do anything about it is they n't!

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