Helena Joyce
Light pollution is a pressing global issue that refers to the excessive or inappropriate use of outdoor artificial light. Caused by inefficient or unnecessary lighting, light pollution has harmful effects on human health, wildlife behaviour, and our ability to observe celestial objects. It is a side effect of industrial civilisation, with sources including building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. Light pollution is most acute in urban environments, with approximately 83% of people living under light-polluted skies. It can cause adverse health effects, disrupt ecosystems, waste energy, and increase the impacts of climate change. Reducing light pollution involves minimising sky glow, glare, light trespass, and clutter. While it is a challenging issue with political, social, and economic considerations, there is a global movement advocating for change, and everyone can contribute to reducing light pollution.
| Characteristics | Values |
|---|---|
| Definition | The human-made alteration of outdoor light levels from those occurring naturally |
| Sources | Streetlights, street lamps, parking lot/shopping mall lights, exterior lights found on most homes/businesses, neon signs, illuminated signboards, advertising, commercial properties, offices, factories, illuminated sporting venues, greenhouses, satellites |
| Effects | Sleep deprivation, fatigue, headaches, stress, anxiety, other health problems, reduced melatonin levels, potential increased risk of cancer, adverse health effects in humans, impact on wildlife behaviour, ability to observe stars and other celestial objects, disruption to ecosystems, waste of energy, increased impacts of climate change |
| Solutions | Use light sources of minimum intensity necessary, turn off lights when not needed, use timers or occupancy sensors, use shielding to reduce glare, dim lights, smarter use of light, choose better outdoor lighting, pass local lighting ordinance |
| Examples | Sky glow, glare, light trespass, light clutter |
| Most affected countries | Singapore, Qatar, Kuwait, United States, Europe |
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What You'll Learn
Light pollution's impact on human health
Light pollution, a result of urbanization and industrialization, is the human-made alteration of outdoor light levels from those occurring naturally. It has been deemed one of the fastest-growing and most pervasive forms of environmental pollution, with 99% of Americans and Europeans living under sky glow.
The impact of light pollution on human health is significant, with a growing body of scientific research highlighting its adverse effects. One of the primary ways it affects humans is by disrupting the body's biological clock, also known as the circadian rhythm. This disruption leads to sleep disorders, reduced sleep times, dissatisfaction with sleep quality, excessive sleepiness, impaired daytime functioning, and fatigue.
The production of melatonin, a hormone that regulates sleep and increases tiredness, is inhibited by the presence of artificial light at night. Blue light, found in cell phones, computers, and LED bulbs, has been shown to reduce melatonin levels, resulting in sleep deprivation and other health issues. Recent studies have also linked reduced melatonin levels to an increased risk of cancer, including breast cancer.
Light pollution has also been associated with mental health issues, including depression, anxiety, and other mental disorders. Additionally, it has been linked to obesity and an increased risk of diabetes.
The American Medical Association has recognized the health risks associated with light pollution, and there is a global movement to reduce it. Light pollution advocacy groups, such as DarkSky International, work to restore the nighttime environment and protect communities from its harmful effects.
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Light pollution's effect on wildlife and ecosystems
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. Common sources of light pollution include street lamps, parking lot lights, exterior lights on homes and businesses, neon signs, illuminated signboards, advertising, commercial properties, offices, factories, and sporting venues.
Light pollution has a significant impact on wildlife and ecosystems. For billions of years, life on Earth relied on a predictable rhythm of day and night, which is encoded in the DNA of all plants and animals. Artificial light disrupts this cycle, affecting the natural behaviours of many species.
One of the most well-known effects of light pollution is its impact on insect populations. The saying "like a moth to a flame" illustrates how artificial lighting can act as a vacuum, attracting insects and disrupting their normal flight activity and long-distance migrations. Insects can become trapped by the light, leading to direct death from the lamp's heat or making them vulnerable to predators. This can change the diversity of insects in an area, and if a species cannot reproduce quickly enough, it may disappear from the community.
Light pollution also affects birds, with reports of seabirds being attracted to lighthouses dating back centuries. Artificial light can "trap" migratory birds, bleaching their visual pigments and causing them to lose sight of the horizon. This can lead to exhaustion, collisions with light sources, and increased susceptibility to predators. It can also disrupt breeding patterns, causing some birds to breed too early.
Additionally, light pollution has been found to impact the behaviour of mammals. Some studies have shown that small mammals, such as mice, eat less in lit areas to avoid predators, while their predators, such as foxes, are attracted to these areas for easy prey.
Light pollution also affects amphibians, such as frogs. As most frogs are nocturnal, artificial light is expected to impact their breeding, feeding, and predator avoidance behaviours. It has been observed that some frogs gather at lights to forage, making them more susceptible to dehydration and predators.
Overall, light pollution has far-reaching effects on wildlife and ecosystems, disrupting natural behaviours and altering the balance of ecosystems.
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Sources of light pollution
Light pollution is caused by a combination of factors, primarily the excessive use of outdoor electrical lighting. There is no single entity to blame, but rather a collective responsibility across the globe. A significant portion of light pollution, estimated at 35% to 50%, comes from roadway lighting. This includes old-fashioned lights that are not shielded, emitting light upwards and sideways.
Outdoor lighting in general, including streetlights, contributes significantly to light pollution. Lights that are not properly shielded or directed downwards can brighten the night sky and negatively impact the environment and human health. Even a single light source, such as a candle seen from a mile away, can be brighter than the stars in a constellation like the Big Dipper, disrupting the natural lightscape.
In addition to roadway lighting, buildings, boats, and fireworks can also contribute to light pollution. For example, in Victoria Harbour, Hong Kong, these factors combine to create light pollution that can be detrimental to the health of people and animals in the area.
Another source of light pollution is air pollution and atmospheric conditions. Aerosols from haze, dust, and air pollutants enhance the skyglow, making the night sky brighter. Clouds over cities can enhance sky brightness by up to 1000 times compared to a clear night due to the reflection and scattering of light.
Light pollution has various negative impacts, including disrupting the migration patterns of sea turtles and birds, attracting and killing insects, and affecting the sleep and activity patterns of humans and animals.
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Solutions to light pollution
Light pollution is a human-made alteration of outdoor light levels from those occurring naturally. It has severely harmful effects on human health, wildlife, and ecosystems. It is imperative to address this issue and implement solutions to reduce light pollution. Here are some ways to tackle this problem:
Education and Awareness:
Education and awareness campaigns are crucial to promoting responsible and sustainable lighting practices among the general public. By understanding the negative impacts of light pollution, individuals can be encouraged to adopt energy-efficient lighting technologies and practices. Social media, public campaigns, and educational programs can be effective platforms for disseminating information and fostering a sense of responsibility within communities.
Proper Lighting Design and Placement:
The design and placement of lighting fixtures play a significant role in reducing light pollution. Communities should prioritize minimizing glare, over-illumination, and light trespass. Properly designed fixtures direct light downward, reducing skyglow and light trespass. This approach can be applied to streets, buildings, and public spaces.
Energy-Efficient Lighting Sources:
LED lights and compact fluorescents (CFLs) are energy-efficient alternatives that can significantly reduce energy consumption and costs. LED lights, in particular, have a longer lifespan and use less energy, making them ideal for public lighting in parks, streets, and public buildings. However, it is important to opt for warm-colored LED bulbs, as blue-white LED lights can contribute to light pollution.
Lighting Ordinances and Regulations:
Implementing lighting ordinances and regulations can help control light pollution. These ordinances can include limiting brightness and color intensity, requiring cutoff lights to reduce glare, and directing spotlighting towards specific subjects. Working collaboratively between lighting designers, policymakers, and stakeholders can lead to the development and enforcement of lighting standards that prioritize sustainability and responsible lighting practices.
Individual Actions:
Individuals can also make a difference by adopting simple habits such as turning off lights when not in use, using window shades to prevent light from escaping outdoors, and reducing the use of electronic devices at night. Additionally, when using flashlights or driving at night, it is advisable to point lights downwards to minimize light pollution. These small actions can collectively contribute to reducing light pollution and preserving the beauty of the night sky.
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Sky glow and light trespass
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is a side effect of industrial civilization, with 83% of the world's people living under light-polluted skies. It is caused by the inefficient or unnecessary use of artificial light, such as street lamps, parking lot lights, advertising, commercial properties, and illuminated sporting venues.
Sky glow is the brightening of the night sky, mostly over urban areas, due to the electric lights of cars, streetlamps, offices, factories, and buildings. It is caused by artificial light scattered in the atmosphere, which obscures views of the night sky. The light is scattered by molecules of gases such as nitrogen, oxygen, water vapour, and carbon dioxide, as well as aerosols like dust, soot, salts, and chemical precipitates. Sky glow is a concern for astronomers and stargazers as it reduces their ability to view celestial objects. It can also negatively impact human health, disrupting the natural circadian rhythm and lowering melatonin production, which can lead to various health issues.
Light trespass is when unwanted light escapes from one property and extends into adjacent properties. It can directly enter a telescope, causing a glow across the field of view and reducing contrast. Light trespass can also make it difficult for a visual observer to adapt to the dark. Examples include a streetlight illuminating a nearby bedroom window or light from a neighbour's property.
To reduce sky glow and light trespass, it is important to use the minimum amount of light necessary and to select light fixtures that limit the amount of light emitted upwards. Turning off lights when not in use and shielding lights to reduce glare can also help. Organizations like the International Dark Sky Association are working to reduce light pollution by educating the public and certifying places that have reduced their light emissions.
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Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally.
Light pollution can come from streetlights, buildings, advertising, offices, factories, sporting venues, boats, and even fireworks.
Light pollution can disrupt ecosystems, interfere with the behaviour of nocturnal wildlife, and have adverse health effects on humans.
Light pollution can obscure views of the night sky, compete with starlight, and increase natural light levels at night. It can also cause light trespass, glare, and clutter.
Solutions to light pollution include using timers or sensors, choosing better light bulbs, and advocating for local legislation to address the issue.
