Greta Jimenez
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by the inefficient or unnecessary use of artificial light, such as the use of exterior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. Light pollution has adverse effects on human health, wildlife behaviour, and our ability to observe stars and other celestial objects. It is a global issue, with 83% of the world's population living under light-polluted skies, and is increasing in both developed and developing countries.
| 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, satellites |
| Effects | Interferes with stargazing, disrupts ecosystems, has adverse health effects, wastes energy, increases impacts of climate change, disrupts wildlife behaviour, affects human sleep and physiology |
| Prevalence | 83% of the world's people live under light-polluted skies, including 99% of Europeans and Americans |
| Solutions | Adjusting light fixtures, using more appropriate light bulbs, shielding exterior lights, using shades for interior lights, using motion sensors or timers, turning off lights when not in use |
| Progress | The EU Biodiversity Strategy for 2030 has recognised light pollution as an environmental problem, some European countries have legal frameworks to restrict light pollution |
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What You'll Learn
- Light pollution is a human-made alteration of outdoor light levels
- It has adverse health effects on humans, wildlife and the environment
- Light trespass is a common problem, causing sleep deprivation
- Skyglow is a concern for astronomers, reducing visibility of stars
- Light pollution is increasing globally, with 83% of people affected
Light pollution is a human-made alteration of outdoor light levels
The sources of light pollution include building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues, and satellites. This excessive artificial lighting results in sky glow, a bright haze above cities produced by light reflecting and bouncing off particles in the atmosphere. Sky glow obscures the night sky, reducing the visibility of stars and other celestial objects. It also disrupts ecosystems, with approximately 83% of the world's people living under light-polluted skies.
Light pollution can negatively impact human health by interfering with the circadian rhythm, a 24-hour internal clock that guides day and night activities and affects physiological processes. Studies have linked reduced melatonin levels, caused by increased night-time light, to sleep deprivation, fatigue, headaches, stress, anxiety, and even cancer. Light trespass, a specific category of light pollution, occurs when unwanted light enters one's property, causing issues such as sleep deprivation.
To address light pollution, individuals can take steps such as turning off lights at night, using shielded and efficient light fixtures, and limiting light leakage from inside their homes. Additionally, the use of timers, motion sensors, and warmer colours of light can help reduce light pollution. Public education and legislative changes are also crucial in combating this issue.
Light pollution is a global concern, with increasing light-polluted skies worldwide. It is important to recognize light pollution as a form of environmental pollution and address its impacts through collective efforts and policy changes.
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It has adverse health effects on humans, wildlife and the environment
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has various adverse effects on human health, wildlife, and the environment.
Adverse effects on humans
The human body relies on the natural rhythm of day and night, which is encoded in our DNA. Light pollution disrupts this cycle, causing several health issues. Nocturnal light exposure has been linked to adverse effects on the circadian rhythm, the internal 24-hour clock that guides our daily activities and physiological processes. This disruption can lead to sleep deprivation, fatigue, headaches, stress, anxiety, and a potential increased risk of cancer. Studies have found a correlation between exposure to artificial light at night and an increased risk of breast cancer in women. Additionally, shift workers who work night shifts regularly have an increased risk of colorectal cancer.
Adverse effects on wildlife
Light pollution also negatively impacts wildlife and their behaviors. It can confuse migratory birds and sea turtles that rely on moonlight for navigation, causing them to lose their way and often leading to their deaths. Artificial lights attract insects, a primary food source for birds and other animals, causing them to be instantly killed upon contact with the light sources. Additionally, underwater artificial lighting may affect animals living in the sea. Even traffic noise combined with artificial lighting can cause birds in cities to alter their behavior and become active earlier than their counterparts in natural areas.
Adverse effects on the environment
Light pollution contributes to the overall alteration of the environment, affecting our ability to observe stars and other celestial objects. With excessive artificial lighting, vast areas of the world are illuminated at night, including North America, Europe, the Middle East, and Asia. This pollution obscures the night sky, making it challenging for people to experience the natural darkness and observe celestial bodies.
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Light trespass is a common problem, causing sleep deprivation
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by the inefficient or unnecessary use of artificial light. Light pollution competes with starlight in the night sky, interferes with astronomical observatories, disrupts ecosystems, and has adverse health effects.
Light trespass is a specific category of light pollution, along with over-illumination, glare, light clutter, and skyglow. Light trespass occurs when unwanted light enters someone's property, for instance, by shining over a neighbour's fence. This can cause problems such as sleep deprivation. A number of cities in the U.S. have developed standards for outdoor lighting to protect their citizens against light trespass.
Light trespass can impact people's sleep when light enters their home from the outside, for example, through a bedroom window. This can cause sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems. Studies have also shown a connection between reduced melatonin levels and cancer.
If you are experiencing light trespass, you can try to contact the responsible party directly. This could be a neighbour, a small business owner, or a government agency. Many organizations are working to reduce light pollution, such as the U.S.-based International Dark Sky Association (IDA), which educates the public and certifies parks and places that have reduced light emissions.
To reduce light trespass, you can select light fixtures that limit the amount of light emitted or use light shields to reduce light entering from unwanted angles. Utilizing light sources of minimum intensity and turning off lights when not in use can also help reduce light pollution.
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Skyglow is a concern for astronomers, reducing visibility of stars
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, streetlights, and illuminated sporting venues.
Skyglow is a specific type of light pollution that refers to the diffuse luminance of the night sky, excluding individual light sources such as the Moon or stars. It is caused by artificial light reflecting off different particles in the atmosphere, creating a bright haze above cities. Skyglow is a concern for astronomers as it reduces the visibility of stars and other celestial objects, interfering with astronomical research and observations. The bright haze caused by skyglow diminishes the contrast in the night sky, making it challenging to observe all but the brightest stars.
The impact of skyglow on star visibility is significant. It obscures the stars, making them appear dimmer or causing them to disappear from view altogether. This effect is more pronounced in areas with high levels of light pollution, such as urban environments, where it can be difficult to see more than a handful of stars. The International Dark-Sky Association works to reduce light pollution and protect the visibility of the night sky.
Additionally, skyglow affects the natural illumination cycles provided by the moon, particularly in coastal megacities like Tokyo and Shanghai. The unpolarized nature of skyglow interferes with the navigation of nocturnal organisms that rely on the polarization signal of scattered moonlight. It also disrupts the migration patterns of birds and sea turtles, which instinctively follow the moon's glow.
The increase in artificial brightness from skyglow has led astronomers to relocate their observation stations further away from civilization. Efforts to mitigate skyglow include lowering the amount of upward-facing or unshielded outdoor lighting, as this contributes significantly to the overall 'sky brightness'. Addressing skyglow requires a coordinated approach, as it is a cumulative phenomenon.
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Light pollution is increasing globally, with 83% of people affected
Light pollution is a side effect of industrial civilization. It is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by the inefficient or unnecessary use of artificial light. Light pollution is increasing globally, with 83% of the world's population experiencing light-polluted night skies. This includes 99% of Europeans and Americans, who live under light-polluted skies that are more than 10% brighter than natural darkness.
Light pollution has several adverse consequences, including ecological, astronomical, and health impacts. Ecologically, light pollution disrupts ecosystems by interfering with the behaviours of migratory birds, nocturnal animals, and pollinators. It also wastes energy and increases the impacts of climate change. Astronomically, light pollution competes with starlight, making it difficult to observe the night sky and study astronomy. It worsens the visibility of the Milky Way and other celestial objects.
In terms of health, light pollution can interfere with human circadian rhythms and sleep cycles, leading to potential health risks. It can also cause direct glare, affecting vision and nighttime recreation experiences. Additionally, it can create safety issues, such as conflicts between wildlife and visitors in natural areas. Light trespass, a specific type of light pollution, occurs when unwanted light enters someone's property or shines through a window, causing issues like sleep deprivation.
The sources of light pollution include building exterior and interior lighting, advertising, commercial properties, streetlights, and illuminated sporting venues. It is most severe in highly industrialized and densely populated areas, such as North America, Europe, and Asia, and in major cities in the Middle East and North Africa. Light pollution is a growing concern, and organizations like DarkSky International are working to address it through education, advocacy, and the promotion of proper lighting practices.
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Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally.
Light pollution is caused by the inefficient or unnecessary use of artificial light. Sources of light pollution include building exterior and interior lighting, advertising, commercial properties, streetlights, and illuminated sporting venues.
Light pollution has adverse effects on human health, wildlife behaviour, and our ability to observe stars and other celestial objects. It can also interfere with astronomical observatories and disrupt ecosystems.
Light pollution is a global issue, with 83% of the world's people living under light-polluted skies. It is most severe in highly industrialised, densely populated areas of North America, Europe, and Asia.
Solutions to light pollution include adjusting light fixtures, using more appropriate light bulbs, and educating the public to push for legislative change. Individuals can also take steps to reduce light pollution, such as turning off lights when not in use and limiting light output from inside the house.
