Brian Barton
Light pollution is a growing problem that has significantly diminished our ability to experience a natural night sky. To solve this problem, it is important to first understand its magnitude by measuring the brightness of the night sky. This can be done through satellite imaging, ground-based studies, and citizen science projects. Satellite imaging uses data from weather satellites to track artificial lighting around the world, while ground-based studies employ instruments like sky quality meters and even the naked eye to measure sky glow. Citizen science projects, such as Globe at Night, encourage people to use their electronic devices or the naked eye to observe and report on the extent of light pollution in their areas. By combining these different methods and standardizing measurements, scientists can gain a comprehensive understanding of light pollution and its impact.
| Characteristics | Values |
|---|---|
| Definition | Unwanted, inappropriate, or excessive artificial lighting |
| Sources | Street lamps, parking lots, shopping malls, building exterior and interior lighting, advertising, commercial properties, offices, factories, illuminated sporting venues, boats, fireworks, satellites |
| Effects | Sleep deprivation, fatigue, headaches, stress, anxiety, other health problems, reduced melatonin levels, cancer, depression, hypertension, attention deficit disorder, obesity, diabetes, heart disease, ecological effects, disruption of migratory bird navigation, reduced moth caterpillar abundance, decline in firefly populations, disorientation of sea turtles |
| Prevalence | 83% of the world's population lives under light-polluted skies, including 99% of Europeans and Americans |
| Solutions | Adjusting light fixtures, using appropriate light bulbs, public education, legislative change, shielding lights, dimming lights, using timers and sensors, using the right color of light |
Explore related products
What You'll Learn
Light trespass
To address light trespass, it is important to first identify the source of the unwanted light. In some cases, it may be necessary to speak to the neighbour or property owner to find a solution together. Organisations such as DarkSky International provide guidance and sample letters to help resolve these issues amicably.
In addition to causing annoyance and frustration, light trespass can also have legal consequences. Several US cities have developed standards for outdoor lighting to protect citizens' rights against light trespass, and organisations like the International Dark-Sky Association have created model lighting ordinances to reduce light pollution.
To reduce light trespass, it is recommended to use shielded lighting fixtures that limit the amount of light emitted upwards and sideways. This not only helps to reduce light trespass but also improves energy efficiency and reduces light pollution.
Electric Cars: Greener or Just Another Polluter?
You may want to see also
Explore related products
![Biological effects of oil pollution : a comprehensive bibliography with abstracts Melvin Light and Joseph J. Lanier. 1978 [Leather Bound]](https://m.media-amazon.com/images/I/61kelb6mFML._AC_UY218_.jpg)
Over-illumination
The adverse effects of over-illumination are extensive. It can interfere with the natural light cycles of animals, disrupting their migratory patterns, sleep habits, mating rituals, and hunting techniques. For example, sea turtles may crawl towards hotel resort lights instead of moonlight over the ocean, and birds may fatally collide with illuminated buildings. Additionally, over-illumination can cause glare, which is a bright and uncomfortable "gleam" that impairs normal vision.
The economic impact of over-illumination should not be overlooked. The International Dark-Sky Association estimates that one-third of all lighting is wasted, resulting in an annual cost of $2.2 billion. This waste contributes to air pollution, as coal-fueled power plants expel a significant amount of carbon dioxide to generate the electricity needed for lighting.
Addressing over-illumination requires a combination of legislative changes, public education, and the implementation of responsible lighting practices. By adopting solutions such as adjusting light fixtures, using appropriate light bulbs, timers, and sensors, and reducing light trespass, we can mitigate the negative impacts of over-illumination on both the natural environment and human well-being.
Ganges River: A Polluted Lifeline
You may want to see also
Explore related products
Glare
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. One of the components of light pollution is glare, which is excessive brightness that causes visual discomfort. Glare is a visual sensation caused by excessive and uncontrolled brightness in the field of view. It is produced by brightness in the visual field that is so much greater than the brightness to which the eyes can adapt. Glare ends up limiting a person’s ability to distinguish details and objects.
There are two forms of glare: disability glare and discomfort glare. Direct glare is the result of high brightness from a light source in the field of vision. For example, the sun in front of a person's eye is direct glare. Direct light causes the most glare. Diffuse light with lampshades and curtains on windows can reduce glare. Indirect glare is the result of light that is reflected in the eye. For example, light from the sun reflecting off a surface into a person's field of view is indirect glare. Reflected light reflects more off shiny surfaces, resulting in indirect glare.
Light trespass is a common problem caused by light pollution, where unwanted light enters one's property, for instance, by shining over a neighbour's fence. A common light trespass problem occurs when a strong light enters the window of one's home from the outside, causing problems such as sleep deprivation. A number of cities in the US have developed standards for outdoor lighting to protect citizens against light trespass.
Green Construction: Recycle, Reuse, Reduce Pollution
You may want to see also
Explore related products
Light clutter
The effects of light clutter can be detrimental to both human health and the environment. Light clutter can interfere with the natural day/night cycle, disrupting the circadian rhythms of humans and other organisms. This disruption has been linked to various health issues, including sleep disorders, depression, hypertension, attention deficit disorder, obesity, and heart disease.
Additionally, light clutter can have ecological consequences. Artificial light can disorient migratory birds, sea turtles, and insects, affecting their navigation, reproduction, and survival. It can also impact plant life, as seen in the decline of moth caterpillar abundance in lit areas.
Addressing light clutter can be achieved through simple measures such as adjusting light fixtures, using appropriate light bulbs, and implementing timers and sensors. Educating the public and advocating for legislative changes can also help reduce light clutter and its associated impacts on human health and the environment.
EPA's Criteria Pollutants: Is Carbon Dioxide One?
You may want to see also
Explore related products
Skyglow
The effects of skyglow can be seen in many cities around the world, with 83% of the world's people living under light-polluted skies. In the United States and Europe, 99% of the population experiences skyglow, and 80% of North Americans cannot see the Milky Way galaxy due to light pollution. Even in remote areas such as Death Valley, the glow from distant cities can be seen, and car lights contribute to the artificial light that disrupts the natural darkness.
The impact of skyglow goes beyond aesthetics and astronomy. It has been linked to adverse health effects in humans and other organisms. Skyglow can interfere with the production of melatonin, a hormone released in the dark that is inhibited by light. Reduced melatonin levels can lead to sleep deprivation, fatigue, headaches, stress, anxiety, and potentially more severe health issues. Additionally, it can disrupt the circadian rhythms of both humans and animals, affecting day and night activities and physiological processes.
To address the issue of skyglow, organisations like DarkSky International work with communities to establish codes and statutes that reduce light pollution. They advocate for the use of timers and sensors, appropriate light bulbs, and proper shielding of light fixtures to minimise light trespass and upward light projection. These efforts not only help restore the natural night sky but also contribute to reducing energy waste and carbon dioxide emissions associated with electricity generation.
Trash Talk: Daily Waste and Pollution
You may want to see also
Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It refers to the effects of any poorly implemented lighting sources, during the day or night.
Light pollution is measured by determining the brightness of the night sky. This can be done through ground-based networks of photometers, satellite imagery, and citizen science campaigns.
Some tools used to measure light pollution include single-channel photometers, all-sky cameras, drones, and the Sky Quality Meter (SQM).
