Bronte Wells
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. Sources of light pollution include building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues, boats, fireworks, and artificial satellites. Light pollution has multiple adverse consequences, including disrupting the sleep and circadian rhythm of humans and wildlife, increasing the risk of cancer, impacting wildlife behaviour, wasting energy, and interfering with astronomical research.
| Characteristics | Values |
|---|---|
| Definition | The human-made alteration of outdoor light levels from those occurring naturally |
| Sources | Building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues, boats, fireworks |
| Effects | Washes out starlight in the night sky, interferes with astronomical research, disrupts ecosystems, has adverse health effects, wastes energy, affects wildlife behaviour |
| Mitigation | Shielding lights, dimming lights, using light only when and where it is needed, using energy-efficient bulbs, implementing and enforcing responsible lighting codes |
| Global Initiatives | Dark Sky Movement, National SQM networks in Austria, Spain, Italy, the Netherlands, DarkSky International |
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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 has been linked to a range of adverse health effects in humans.
Firstly, light pollution can disrupt the body's natural cycles, including the circadian rhythm, or body clock, which is a group of physiological and neurological changes that occur in the body over a 24-hour period. This disruption can lead to sleep disorders, such as reduced sleep times, dissatisfaction with sleep quality, excessive sleepiness, and impaired daytime functioning, as well as fatigue.
Secondly, light pollution has been associated with an increased risk of obesity, depression, diabetes, and cancer, including breast cancer. This may be due to the inhibition of melatonin production by artificial light. Melatonin is a hormone that is released in the dark and helps to regulate sleep cycles. Blue light, in particular, has been shown to reduce melatonin levels, and it is found in cell phones, computers, and LED bulbs.
Additionally, light pollution can cause eye strain and headaches, as well as contributing to stress and anxiety. It can also have indirect effects on human health, such as when it disturbs people indoors, who then turn on more lights and expose themselves to more artificial light.
The impact of light pollution on human health is an emerging area of research, and it is considered one of the fastest-growing and most pervasive forms of environmental pollution. Efforts to reduce light pollution include advocating for local legislation and choosing better outdoor lighting.
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Its effects on wildlife
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has disrupted the natural rhythm of day and night, which is encoded in the DNA of all plants and animals. The negative effects of light pollution on wildlife are far-reaching and are detailed below.
Effects on Nocturnal Animals
Nocturnal animals are active at night and sleep during the day. Light pollution radically alters their nighttime environment by turning night into day. Nocturnal birds, for example, use the moon and stars for navigation during their bi-annual migrations. When flying through brightly lit areas, they become disoriented, which can lead to collisions with objects.
Effects on Migratory Birds
Migratory birds can be attracted to the light beam of lighthouses, causing them to lose sight of the horizon and circle within the cone of light. This can lead to death from exhaustion or collision with the light source. Light pollution can also extend the day for diurnal species of songbirds, making them more susceptible to predators as they reveal their location by singing.
Effects on Sea Turtles
Bright lights near beaches discourage female sea turtles from coming ashore to nest. Newly hatched turtles need a dark night sky to orient themselves toward the sea, but artificial lights behind beaches lure them inland or away from the water, where they face predators, dehydration, or the risk of being run over by cars.
Effects on Insects
Light pollution acts like a vacuum for many insects, attracting them and disrupting their normal flight activity and long-distance migrations. Insects can be killed directly by the heat of lamps or become easy prey for predators. Moths, for example, may lose essential defensive behaviours when near artificial light, making them vulnerable to predators.
Effects on Other Wildlife
Fireflies may not mate normally near incandescent light because it mimics their spectrum. Pumas travelling at night avoid brightly lit areas, causing them to miss crucial landscape linkages.
Overall, light pollution has profound implications for the health and behaviour of wildlife, and it is important to address this issue through measures such as reducing light pollution, protecting dark skies, and implementing wildlife-friendly lighting practices.
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Light pollution's economic and environmental costs
Light pollution is a significant issue in astronomy, and it refers to the excessive and inappropriate use of artificial light that illuminates the night sky, obscuring our view of the stars and interfering with astronomical research. This type of pollution has various economic and environmental costs that are often overlooked.
One of the primary economic costs of light pollution is the waste of energy resources. It is estimated that approximately 30% of all outdoor lighting in the United States is wasted, amounting to an extra $3.3 billion in energy costs annually. This waste occurs because many lights are left on when not needed, are poorly designed, or are used for unnecessary purposes. Improper lighting also contributes to climate change, as the energy used to power these lights often comes from the burning of fossil fuels, leading to increased carbon emissions.
The environmental costs of light pollution are far-reaching and detrimental. It disrupts the natural cycles of many organisms, affecting their feeding, breeding, and migration patterns. For example, artificial light can disorient birds, causing them to fly into buildings or other structures, and it can also impact the ability of insects to navigate, disrupting pollination and food web dynamics. In addition, light pollution can affect the growth and development of plants, as many species rely on the moon and stars for cues on when to flower or drop their fruit.
There are also significant impacts on human health and well-being. Exposure to artificial light at night, especially the blue light emitted by LED lights, can disrupt our body's natural circadian rhythms, impacting sleep patterns and contributing to issues such as obesity, depression, and cardiovascular problems. Light trespass, where unwanted light enters a person's property, can also cause annoyance and discomfort, affecting quality of life.
The economic costs of these health impacts are substantial. Lost productivity due to sleep disturbances and associated health issues can cost billions of dollars annually. Additionally, the excessive use of blue-rich white LED lights, which are often used in street lighting, can lead to increased glare, reducing visibility and contributing to road accidents.
Lastly, light pollution also imposes significant costs on the field of astronomy itself. It limits the ability to observe and study the universe, requiring astronomers to seek out increasingly remote and costly locations to conduct their research. Building and maintaining observatories in these isolated areas incurs substantial expenses, and the loss of potential discoveries due to limited viewing sites adds an intangible cost to the field of science. Addressing light pollution is, therefore, crucial to mitigating these economic and environmental impacts, ensuring a healthier and more sustainable future.
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How light pollution affects astronomy
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is a side effect of industrial civilization, with sources including building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues, boats, and fireworks. Light pollution has multiple adverse consequences, including disrupting ecosystems and human health, and interfering with astronomical observatories.
Astronomy is very sensitive to light pollution. Excessive artificial light can wash out starlight in the night sky, making it difficult to observe stars and other celestial objects. This problem is particularly acute in highly industrialized, densely populated areas of North America, Europe, and Asia, as well as major cities in the Middle East and North Africa, such as Tehran and Cairo. Even relatively small amounts of light can have an impact, and with more than half of the world's population now living in cities, most people have never experienced truly dark skies.
The increasing prevalence of artificial light at night (ALAN) is causing a significant rise in light pollution, and this is exacerbated by the widespread adoption of LEDs. Light pollution can interfere with astronomical research in several ways. Firstly, it can reduce the visibility of stars and the Milky Way, increasing natural light levels at night. This can be particularly problematic for observatories located near cities, as the light from the city can drown out the sky. Additionally, light pollution can alter the color of the object being studied, often creating a pronounced green cast.
There are some methods to reduce the effects of light pollution on astronomy. For example, astronomers may use light pollution reduction (LPR) filters, which are designed to reduce (but not eliminate) the effects of light pollution by filtering out certain wavelengths of light. However, LPR filters also reduce the brightness of the object under study, limiting the use of higher magnifications. Another method is to implement responsible lighting codes that prioritize downward-directed, shielded, and warmer-colored lighting, as has been done successfully in Tucson and Flagstaff, Arizona.
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Strategies to combat light pollution
Light pollution is a global issue that has been exacerbated by the widespread adoption of LEDs. It negatively impacts astronomy, ecosystems, and human health, including disrupting circadian rhythms and potentially increasing the risk of cancer. To combat light pollution, a multi-faceted approach is required, including implementing responsible lighting practices and advocating for change through organisations like dark sky societies. Here are some strategies to reduce light pollution:
Implement Responsible Lighting Practices
The purpose of outdoor lighting is to illuminate areas near the ground, so all light generated should be directed downward. Shielding can be used to block light from escaping sideways or upward toward the sky, reducing skyglow. This can be achieved by installing full cut-off shields on street lights and other outdoor lighting fixtures.
Advocate for Change
Join or support organisations dedicated to reducing light pollution, such as dark sky societies, who push for changes in lighting practices and policies. Talk to your neighbours about improving their lighting setups and spread awareness about the importance of protecting dark skies. Petition your local government to address light pollution and enforce responsible lighting codes, as has been successfully done in Tucson and Flagstaff, Arizona.
Use Light Pollution Filters
Although not a comprehensive solution, light pollution filters for telescopes can help block specific wavelengths of light commonly emitted by street lamps. There are different types of filters, such as broadband, narrowband, and line filters, each blocking particular wavelengths. While these filters may not distinguish between artificial light and starlight, they can be useful in heavily light-polluted areas.
Identify Less Polluted Areas
Use tools like lightpollutionmap.info to identify areas with less light pollution. These maps provide Sky Quality Meter and Bortle Scale readings, helping you find darker locations for astronomy observations. Additionally, organisations like Dark Sky International maintain lists of International Dark Sky Parks and Urban Night Sky Places that offer better viewing conditions.
Reduce Light Pollution at Home
If you live in a rural area, minimise light pollution by avoiding lights that shine outward from your windows. Use blackout curtains to block indoor light from escaping outside. When observing the night sky, turn off any unnecessary lights to reduce their impact on your surroundings.
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Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is a side effect of industrial civilization. Its sources include building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues.
Light pollution competes with starlight in the night sky, interferes with astronomical observatories and research, and washes out our view of the Milky Way galaxy and stars.
Light pollution disrupts ecosystems and has been shown to impact animal behaviors, such as migration patterns, wake-sleep habits, habitat formation, reproduction, hunting, and feeding.
Light pollution interferes with the production of melatonin, a hormone released when it is dark and inhibited when there is light present. Reduced melatonin production can lead to sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems, including an increased risk of cancer.
