Kiera Jefferson
Light pollution is a growing problem, with the night sky getting brighter by 9.6% per year from 2011 to 2022. Light pollution is caused by artificial light, which can impact people in two ways: direct glare from light fixtures can affect vision and nighttime experiences; and sky glow from collective artificial light sources scattered in the atmosphere can obscure views of the night sky. The International Dark Sky Places program certifies communities, parks, and protected areas that preserve and protect dark sites through reduced light pollution. These places provide a quality nighttime experience, allowing people to connect with nature and enjoy a sky full of stars. Efforts to combat light pollution include partnerships with universities, nonprofits, and community groups, as well as establishing codes and statutes for outdoor lighting to reduce its negative impacts on humans, wildlife, and the climate.
| Characteristics | Values |
|---|---|
| Definition | The absence of light pollution refers to a night sky free of artificial light. |
| Impact on human vision | Light pollution prevents the human eye from fully dark-adapting and reaching its maximum sensitivity. |
| Impact on nature | Light pollution disrupts ecosystems, wastes energy, increases the impacts of climate change, and can have adverse health effects in humans. |
| Locations | Locations with minimal light pollution include rural China, Amboy, Montana, Utah, Idaho, Colorado, and several states in the middle of the US with higher populations of cows than people. |
| Preserves and parks | Dark Sky Preserves and Parks are certified locations that offer a quality nighttime experience and allow people to connect with nature at night. Examples include Craters of the Moon in Idaho, Saguaro National Park in Arizona, and Timpanogos Cave National Monument in northern Utah. |
Explore related products
What You'll Learn
Light pollution's impact on human health and nature
Light pollution is the excessive or inappropriate use of outdoor artificial light. It is caused by boats, buildings, street lights, fireworks, and other sources of illumination. This type of pollution has been found to impact human health, wildlife behaviour, and our ability to observe the night sky.
The night sky is naturally, culturally, and historically important. The International Astronomical Union recommends that governments establish 'Dark Sky Oases' to protect citizens' right to enjoy the view of the stars. Dark Sky Places are ecologically sensitive areas that use quality outdoor lighting, effective policies to reduce light pollution, and ongoing stewardship practices.
Light pollution can have a detrimental impact on human health. Our bodies are designed to release melatonin in low light conditions, which increases tiredness and regulates sleep cycles. Light pollution has been found to curb melatonin production, even at low levels, which can result in disturbed sleep, impacted immune systems, and altered responses to stress. Furthermore, our eyes are capable of adjusting to very low-light conditions, providing us with a degree of night vision. However, due to light pollution, a significant proportion of people living in illuminated areas don't develop this ability.
Light pollution also affects wildlife and their behaviour. It can disrupt the natural body rhythms of animals, similar to how it affects humans. Even in places meant to provide protected habitats for wildlife, light pollution is encroaching and making an impact. This form of pollution is considered one of the fastest-growing and most pervasive forms of environmental pollution, with far-reaching consequences for both humans and nature.
Airplane Noise Pollution: Understanding the Disturbing Sounds
You may want to see also
Explore related products
Dark Sky legislation and conservation
The dark sky movement is a campaign to reduce light pollution and has seen many successes since the world's first dark sky legislation in 1958. DarkSky International, the world's leading authority on light pollution, works with communities, parks, municipalities, manufacturers, retailers, designers, and the public to certify and protect dark places for humans and wildlife.
The movement encourages the use of full-cutoff fixtures that emit little to no light upward in public areas, and generally pushes communities to adopt lighting regulations. Dark sky lighting is a concept that minimizes light pollution. This involves using shielded lights on the top and sides, with motion detectors, so that light is only directed downwards and is only used when needed. Amber-coloured lighting is also critical to minimizing the brightness of skyglow and reducing glare. The International Dark-Sky Association certifies fixtures as dark sky friendly, and these will have the IDA Fixture Seal of Approval.
Dark Sky Places are established to remind us that the night sky is important to our culture and history. These places protect ecologically sensitive areas and our universal heritage in the starry night sky. Certified places are required to use quality outdoor lighting, implement effective policies to reduce light pollution, and follow ongoing stewardship practices. There are over 70 chapters of the dark sky movement around the world, with over 60 international chapters at the forefront of the movement.
Some communities are making changes to lighting to reduce light pollution, such as the city of Merritt, British Columbia, which has installed down-cast lighting to commercial buildings. The benefits of this include saving energy, preserving the environment, reducing crime and increasing safety, and reducing health risks.
Reducing Factory Pollution: Strategies and Innovations
You may want to see also
Explore related products
$18.04 $18.99
Light pollution's effect on astronomy
Light pollution is the excess or inappropriate artificial light outdoors. It occurs through glare, light trespass, and skyglow. Glare is the bright and uncomfortable light shining directly at an observer that interferes with their vision. Light trespass is the unintended spill of artificial light into another person's property or space.
Light pollution is increasing globally, in both developed and developing countries. It prevents the human eye from fully dark-adapting and reaching its maximum sensitivity. It also has a large effect on the life under it. Researchers have shown that it negatively impacts many animals and plants. For example, light pollution disrupts the migrations of birds, the delicate blossoming of flowers, and even the luminous courtship of fireflies. It also affects humans, possibly triggering insomnia and other health problems.
Light pollution has a significant impact on astronomy. It diminishes our view of the night sky, which is considered a natural resource worthy of conservation. The night sky is adorned with treasures scattered among the stars, and observing it can nourish the soul and foster a profound appreciation of the natural world. Losing our view of the sky at an alarming rate of almost 10% each year means that we are missing out on the beauty and connection to nature that stargazing provides.
The International Astronomical Union recommends that national and local governments establish a suitable number of 'Dark Sky Oases' to safeguard citizens' rights to enjoy the starred sky. These Dark Sky places, such as parks, sanctuaries, and reserves, aim to protect ecologically sensitive areas and preserve the starry night sky. They provide a quality nighttime experience, allowing visitors to connect with nature and witness a sky full of stars, and possibly even the Milky Way, with the naked eye.
To combat light pollution, individuals can take simple steps such as turning off lights when not in use, especially outdoor lights that contribute to sky brightness. Additionally, shielding lights to ensure they point downward can help reduce sky brightness and preserve the night sky for astronomy enthusiasts and nature lovers alike.
Ocean Pollution: A Growing Global Crisis
You may want to see also
Explore related products
Light pollution's influence on human circadian rhythms
Light pollution is a growing concern, affecting over 80% of the global population. It is caused by inefficient, annoying, and unnecessary artificial outdoor lighting, and it has been shown to have adverse effects on human health and wildlife.
Humans, like most life on Earth, follow a circadian rhythm, or a sleep-wake pattern, that is governed by the natural day/night cycle. This cycle is largely influenced by photoreceptors in the eye that are more sensitive to blue wavelengths of light. During the day, bright light is needed to support a healthy circadian rhythm, but at night, it is important to minimise the amount of light entering our eyes to maintain a good cycle.
Artificial light at night can negatively impact this natural cycle, and research has shown that it increases the risk of obesity, depression, sleep disorders, diabetes, and breast cancer, among other issues. For example, a study on newborn mice, comparable in development to 13-week-old human fetuses, showed that constant exposure to artificial light for several weeks resulted in an inability to maintain a coherent circadian cycle. Additionally, the incidence of major depression has grown in parallel with the adoption of electric lights, although this is only a correlation.
To mitigate the effects of light pollution, individuals can use bluer light sources during the day and warmer, dimmer lights at night. Advanced bulbs can also be programmed to automatically change colour and intensity throughout the day. On a larger scale, organisations like DarkSky International work with communities to establish codes and statutes that reduce light pollution and educate the public about its harmful effects.
In conclusion, light pollution can have significant impacts on human circadian rhythms, and it is important to take steps to minimise its effects to maintain a healthy sleep-wake cycle.
Cumberland River Pollution: What's the Status?
You may want to see also
Explore related products
![The Darkness [Blu-ray]](https://m.media-amazon.com/images/I/81+Vvs1l4SL._AC_UY218_.jpg)
Light pollution solutions and reduction
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 is a global issue that affects human health, wildlife behaviour, and our ability to observe stars and other celestial objects. It also threatens aquatic ecosystems by increasing the risk of harmful algae blooms.
There are several solutions and reduction strategies for light pollution. Firstly, individuals, institutions, and governments should take action to limit light pollution. This includes changing light bulbs and fixtures to LEDs and compact fluorescents (CFLs), which can help reduce energy use and protect the environment. However, only warm-coloured bulbs should be used to limit the luminance and spectrum of the lighting system. Additionally, shielding can be used to reduce glare and light trespass onto neighbouring properties.
Secondly, measures should be adopted to govern development around biodiversity and protected areas. This includes establishing codes and statutes that reduce light pollution and creating and promoting dark-sky areas. Dark Sky International, for example, certifies lighting products, designs, and installations that reduce light pollution. They also work with communities to establish laws and requirements for outdoor lighting to reduce light pollution.
Thirdly, public education and awareness are crucial. Organisations like DarkSky International inform the public about how excessive artificial light can harm humans, wildlife, and the climate. They also advocate for the conservation of the night sky as a natural resource and promote the economic benefits of dark sky tourism.
Finally, individuals can make a difference by supporting organisations like DarkSky International and participating in local advocacy efforts. They can also choose better outdoor lighting for their homes and support local legislation to reduce light pollution. By working together, we can slow the growth of light pollution and begin to reverse its harmful effects.
Mud Snails: Pollution Intolerance in New Zealand
You may want to see also
Frequently asked questions
Light pollution is the presence of excessive artificial light in normally dark environments, such as at night or in remote locations.
Light pollution can have several negative effects. It can disrupt ecosystems, waste energy, increase the impacts of climate change, and have adverse health effects in humans. It can also diminish our ability to see the night sky, as artificial light obscures our view of stars and planets.
A "no light pollution" area is a place where measures have been taken to reduce or eliminate artificial light pollution. These areas are often protected as Dark Sky Places or Dark Sky Parks, and they provide a quality nighttime experience where people can connect with nature and enjoy the night sky.
"No light pollution" areas can be found all around the world, although they are becoming increasingly rare due to the growing prevalence of light pollution. Some examples of places with low light pollution include national parks, such as those in the US, and remote locations, such as rural China or Montana and Utah in the US. There are also specific Dark Sky Places certified by organizations like DarkSky International, which you can find listed on their website.
![The Darkness [DVD]](https://m.media-amazon.com/images/I/A1qy7Pa0YKL._AC_UY218_.jpg)
