Meghan Hodges
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by the excessive or inappropriate use of outdoor artificial light, which affects human health, wildlife behaviour, and our ability to observe stars and other celestial objects. Light pollution competes with starlight in the night sky, interferes with astronomical observatories, disrupts ecosystems, wastes energy, increases the impacts of climate change, and has adverse health effects on humans. It also affects the behaviour of animals, such as sea turtles and birds, during migration. To address light pollution, solutions such as adjusting light fixtures, using appropriate light bulbs, and educating the public to push for legislative change are often recommended.
| Characteristics | Values |
|---|---|
| Definition | Human-made alteration of outdoor light levels from those occurring naturally |
| Sources | Street lamps, parking lot/shopping mall lights, exterior lights, neon signs, illuminated signboards, smartphones, etc. |
| Effects | Disrupts ecosystems, wastes energy, increases impact of climate change, adverse health effects in humans, affects wildlife behaviour, loss of access to starry night sky, etc. |
| Solutions | Adjusting light fixtures, using appropriate light bulbs, shielding lights, dimming lights, turning off lights, etc. |
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What You'll Learn
Light pollution's impact on human health
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by artificial light sources such as streetlights, greenhouses, and satellites, among others. This form of pollution has various effects on human health, wildlife behaviour, and our ability to observe celestial objects.
The impact of light pollution on human health is an emerging area of research. It has been established that artificial light at night can negatively affect human health, increasing the risk of obesity, depression, sleep disorders, and diabetes, and even cancer. The American Medical Association has found that brighter residential nighttime lighting is associated with reduced sleep times, dissatisfaction with sleep quality, excessive sleepiness, impaired daytime functioning, and obesity. Furthermore, blue light, which is found in cell phones, computer devices, and LED bulbs, has been shown to reduce melatonin levels in humans. Melatonin is a hormone that is released in the dark and inhibited when there is light present. A decrease in melatonin due to light pollution can lead to sleep deprivation, fatigue, headaches, stress, anxiety, and other health issues.
In addition to the physical health consequences, light pollution can also cause a feeling of "sky grief" or "noctalgia," a term coined by Aprana Venkatesan and John Barentine. This refers to the loss of access to a starry night sky and the sense of awe and wonder that comes with stargazing, which has been a part of human existence for millennia.
Light pollution also has an impact on shift workers, who are at a higher risk of developing cancers, according to studies. The International Agency for Research on Cancer (IARC) has brought attention to this issue, highlighting the potential dangers of shift work.
While light pollution has negative consequences, it is important to recognize that artificial light has benefited society by extending the productive day and providing illumination for various activities. However, when artificial lighting becomes inefficient, annoying, and unnecessary, it contributes to light pollution and its associated health risks.
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Light pollution's impact on wildlife
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by artificial light sources such as streetlights, greenhouses, and satellites, among others. This form of pollution competes with starlight in the night sky, interferes with astronomical observatories, disrupts ecosystems, and has adverse health effects on both humans and wildlife.
The impact of light pollution on wildlife is significant and far-reaching. Firstly, it disrupts the natural behaviour of many species, including birds and insects. For example, the artificial light from buildings and lighthouses can attract and trap migratory birds, causing them to lose their way and circle endlessly within the cone of light. This can lead to exhaustion, increased susceptibility to predators, and even death from collision with the light source.
Light pollution also affects the breeding and reproductive cycles of certain species. Frogs and toads, for instance, rely on nighttime croaking as part of their breeding ritual. Artificial lights can disrupt this nocturnal activity, leading to reduced breeding success and declining populations. Similarly, diurnal species of songbirds may be induced to breed too early due to the extension of daylight, as they associate longer days with breeding.
Additionally, light pollution can alter the natural habitats of various organisms. It can attract some species, such as moths, frogs, and sea turtles, to areas where they become concentrated as a food source for predators or become trapped and exhausted. At the same time, it can repel other species, excluding them from their natural habitats. This alteration of habitats can lead to a disruption of food webs and ecological relationships.
Furthermore, light pollution impacts the day-night patterns of many animals. It can cause some species to become active earlier or alter their sleep and rest patterns, affecting their health and well-being. For example, a study found that traffic noise and artificial night lighting caused birds in cities to become active several hours earlier than their counterparts in natural areas.
The effects of light pollution on wildlife are not limited to terrestrial organisms. Underwater artificial lighting may also impact marine life. Sea turtles, for instance, rely on moonlight during migration, and artificial lights can confuse and disorient them, leading to fatal consequences.
Overall, light pollution has far-reaching consequences for wildlife, altering their behaviour, reproduction, habitats, and survival. Addressing this issue through measures such as adjusting light fixtures, using appropriate light bulbs, and advocating for legislative change, is crucial for mitigating the harmful impacts on ecosystems and the environment as a whole.
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Light pollution's impact on astronomy
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by the excessive or inappropriate use of outdoor artificial light. Light pollution competes with starlight in the night sky, making it difficult to observe celestial objects. This is especially true in urban areas, where light pollution is most prevalent.
The impact of light pollution on astronomy is significant. It affects the visibility of diffuse sky objects like nebulae and galaxies, rendering most such objects invisible in heavily light-polluted skies. Light pollution also causes a glow across the field of view of telescopes, reducing contrast and making it difficult for observers to adapt to the dark. This is known as light trespass, and it is a major issue for astronomers.
In addition to the direct impact on observations, light pollution also has indirect effects on astronomy. For example, it can disrupt ecosystems and have adverse health effects on both humans and wildlife. This can impact the ability of astronomers to conduct research and make observations.
Furthermore, light pollution can lead to a feeling of loss of access to seeing a starry night sky, known as noctalgia or "sky grief". This phenomenon includes the grief over not being able to experience the sense of awe and wonder that comes with stargazing, as well as the loss of cultural practices associated with the night sky, such as storytelling and celestial navigation.
To mitigate the impact of light pollution on astronomy, simple solutions such as adjusting light fixtures or using more appropriate light bulbs can be implemented. Public education and legislative change are also important in reducing light pollution and preserving the night sky for astronomical observations.
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Light trespass
To address light trespass, it is recommended to approach the source of the light trespass and resolve the issue amicably. This can include offering to help aim the light more efficiently or suggesting the use of a motion detector to ensure that the light is only on when needed. In some areas, such as unincorporated areas of Riverside County, California, light trespass is illegal, and violators may be fined or even jailed if they do not comply.
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Skyglow
The brightening of the night sky due to skyglow also affects human health and wildlife behaviour. Nocturnal light from skyglow interrupts sleep and confuses the circadian rhythm, which guides day and night activities and affects physiological processes in nearly all living organisms. For example, an increased amount of light at night lowers melatonin production, resulting in various health problems such as sleep deprivation, fatigue, headaches, stress, and anxiety. Additionally, birds and sea turtles guided by moonlight during migration get confused, lose their way, and often die due to skyglow.
To address the issue of skyglow, organizations like the International Dark-Sky Association (IDA) work to preserve the natural night sky by educating the public and certifying parks and places that have reduced their light emissions. Flagstaff, Arizona, for example, enacted a lighting code in 1973 and was designated the World's First International Dark-Sky Community in 2001. Other cities, such as Sedona, Arizona, and Borrego Springs, California, have also followed suit in enacting light pollution ordinances. These efforts to reduce skyglow are part of a global movement to restore the nighttime environment and protect communities and wildlife from the adverse effects of light pollution.
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Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is the excess or inappropriate use of outdoor artificial light.
Light pollution can make the night sky appear bright or yellow, turning night into day. In cities with high levels of light pollution, it can be hard to see the stars.
There are four types of light pollution: glare, clutter, light trespass, and skyglow.
Light trespass is when unwanted light escapes from one property into adjacent properties. For example, when a streetlight shines into a nearby bedroom window.
Light pollution can disrupt the migration, reproduction, hunting, and feeding of animals. For example, sea turtles and birds that are guided by moonlight during migration can get confused, lose their way, and die.
