Kiera Jefferson
Light pollution is a growing problem that affects human health and wildlife, and it is estimated that more than 80% of people live under light-polluted skies. The worst city in the world for light pollution appears to be a contentious topic, with sources citing Hong Kong, Saint Petersburg, and Mecca as the most light-polluted places. Hong Kong's light pollution has been described as a disease, with excessive lighting disrupting the sleep and biological clocks of residents. Saint Petersburg's artificial lighting is reported to be 8.1 times brighter than the global urban average.
| Characteristics | Values |
|---|---|
| Most light-polluted city | Hong Kong |
| Commercial areas with severe light pollution | Mong Kok, Tsim Sha Tsui, and Causeway Bay |
| Light pollution in residential areas | Sham Shui Po |
| Light pollution affecting nature | Affects the reproduction of fireflies |
| Light pollution affecting human health | Disrupts the biological clock, affects brain and hormone functions, and increases the risk of some cancers |
| Light pollution in nature | More than 80% of people live under light-polluted skies and cannot see the Milky Way |
| Countries with the most light pollution | Singapore, Kuwait, Qatar, and the United Arab Emirates |
| Cities with notable light pollution | Moscow, Medina, Saint Petersburg, Miami, Denver, Mexico City, Detroit, Buenos Aires, Toronto, Chicago, Montreal, Riyadh, Tangier, Helsinki, Edmonton, Calgary, Kuwait City, Chelyabinsk, Mecca |
| Contributing factors to light pollution | High population density, geographical and cultural influences, tourism, advertising, and inexpensive electricity |
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What You'll Learn
- Hong Kong: the world's worst city for light pollution
- Saint Petersburg, Russia: artificial lighting is 8.1 times brighter than the global urban average
- Effects on humans: light pollution can affect sleep and human health
- Effects on wildlife: light pollution kills 300 million to 1 billion birds annually
- Solutions: voluntary guidelines and charters, or specific legislation
Hong Kong: the world's worst city for light pollution
Hong Kong has been named the world's worst city for light pollution. The issue of light pollution in Hong Kong first came to public attention in 2008, and the government initiated a policy review the following year. This culminated in the 2011-2015 "Task Force on External Lighting", which included two rounds of public consultation in 2013.
The commercial and residential areas of Mong Kok, Tsim Sha Tsui, and Causeway Bay are the most severely affected by light pollution. Spotlights and LED billboards make the sky in Hong Kong much brighter than in other cities. A Symphony of Lights, a tourist attraction, has been criticized for its contribution to light pollution. In heavily mixed residential areas such as Mong Kok and Sham Shui Po, residents have trouble sleeping due to the bright neon lights shining through their bedroom windows from billboards. Some precincts have been described as being lit up like football stadiums.
The excessive light can disrupt the biological clocks (Circadian rhythm) of humans, affecting their brains and hormone functions. The light emitted from large LED billboards in the city can also affect the reproduction of fireflies, an insect that relies on light signals to mate. According to the Hong Kong Entomological Society chairman Yiu Vor, they emit their signals less frequently, which affects their survival.
The problem of light pollution in Hong Kong is not limited to commercial areas but has also spread to residential areas outside the urban center. The brightness at the Wetland Park in Tin Shui Wai, for example, was 130 times higher than the International Astronomical Union standard. The number of complaints about light pollution has increased from 87 in 2007 to 377 in 2009, indicating the seriousness of the problem. Despite this, the task force recommended against introducing any rules or legislation, suggesting instead a voluntary "Charter on External Lighting" in 2016, which businesses might follow to turn off external lighting between 11:00 PM and 6:00 AM. However, this has been criticized as ineffective and "toothless."
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Saint Petersburg, Russia: artificial lighting is 8.1 times brighter than the global urban average
Light pollution is a pressing issue that affects almost 80% of the globe. Artificial lighting at night can have detrimental effects on both humans and wildlife. For example, it can disrupt human sleep cycles and negatively impact the reproduction of certain insects.
According to a ranking by The Revelator, St. Petersburg, Russia, is the most light-polluted city in the world. The artificial lighting in St. Petersburg is 8.1 times brighter than the global urban average. This brightness is measured in nanoWatts/cm2/sr and highlights the severity of the light pollution issue in the city.
Several factors may contribute to the high level of light pollution in St. Petersburg. One factor could be the geographical location of the city. Cities in northern latitudes, where sunlight is less abundant, tend to have higher levels of artificial lighting. This additional lighting can be necessary to compensate for the lack of natural light during the day.
Additionally, cultural and social factors may play a role in the bright lighting of St. Petersburg. The city is a popular tourist destination, and certain areas may be brightly illuminated to showcase architectural landmarks or historical sites. Moreover, the local culture and customs may encourage evening activities and social gatherings that require ample lighting.
The impact of light pollution in St. Petersburg extends beyond the aesthetic concerns of a glowing skyline. The excessive artificial lighting can disrupt the natural cycles of both humans and wildlife in the area. For humans, the bright lights can interfere with sleep patterns and affect hormone production, leading to potential health risks. For wildlife, the artificial lighting can disorient birds, disrupt underwater ecosystems, and impact the mating rituals of insects, such as fireflies, that rely on light signals.
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Effects on humans: light pollution can affect sleep and human health
Light pollution is a growing problem in many cities around the world, and it can have significant impacts on human health and sleep. Hong Kong, for instance, has been named the world's worst city for light pollution. The issue is particularly severe in commercial and residential areas such as Mong Kok, Tsim Sha Tsui, and Causeway Bay, where the brightness from spotlights and LED billboards is far higher than recommended levels.
The effects of light pollution on human sleep and health are well-documented. Light plays a crucial role in regulating the body's circadian rhythm, also known as the sleep-wake pattern or the internal clock. This rhythm is influenced by photoreceptors in the eye that are sensitive to blue wavelengths of light. When exposed to only natural light, a person's circadian rhythm synchronizes with the day-night cycle, promoting wakefulness during the day and sleep at night. However, artificial light at night, such as from streetlights, office lighting, or electronic devices, can disrupt this natural cycle.
Excessive exposure to artificial light at night has been linked to various negative health outcomes. Research suggests that it can increase the risk of obesity, depression, sleep disorders, diabetes, and even breast cancer. Specifically, it has been found to suppress melatonin production, which is essential for inducing sleep, boosting the immune system, and regulating various bodily functions. Furthermore, disrupting the circadian rhythm can lead to insufficient sleep, excessive sleepiness during the day, mood disorders, and an elevated risk of accidents.
The impact of artificial light on sleep is significant. Studies have shown that brighter residential nighttime lighting is associated with reduced sleep duration, dissatisfaction with sleep quality, and impaired daytime functioning. Shift-work sleep disorder and delayed sleep-phase syndrome are examples of sleep disorders that can arise from a misaligned circadian rhythm due to light exposure at night.
To mitigate the effects of light pollution on sleep and health, it is important for individuals to minimize their exposure to artificial light at night. Creating a bedroom environment that is conducive to sleep, such as using blackout curtains or blue light filters, can help improve sleep quality. Additionally, maintaining a consistent sleep schedule and incorporating light therapy can also be beneficial in regulating the body's internal clock.
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Effects on wildlife: light pollution kills 300 million to 1 billion birds annually
Light pollution is a growing problem, with 80% of the world's population now living under light-polluted skies. Sources of light pollution include street lamps, advertising boards, floodlights, homes, boats, buildings, and fireworks. Light pollution has a significant impact on wildlife, with one of the most notable effects being the disruption of bird migration. It is estimated that between 300 million and 1 billion birds are killed annually due to collisions with artificially lit buildings.
Artificial light can cause birds to become disoriented and veer off course, leading them towards dangerous city landscapes. This disruption can alter their migration patterns, sleep habits, and habitat formation. For example, a study of blackbirds in Germany found that city birds exposed to artificial night lighting became active earlier than their country counterparts, waking and singing up to five hours sooner.
Light pollution can also affect the nesting behaviour of birds. Plovers, for example, require darkness to hide their open-sand nests from predators. In one case, conservationists noticed that plovers were not nesting in a particular area and suspected that the bright security lights of a nearby facility were the cause. After the lights were dimmed, 10 snowy plover nests appeared on the previously unused beachfront.
Additionally, light pollution can act as a trap for migratory birds. The lights can bleach their visual pigments, causing them to lose sight of the horizon and circle endlessly within the cone of light. This can lead to exhaustion and collisions with the light source. It can also extend the day for diurnal songbirds, making them more vulnerable to predators and causing them to breed prematurely.
The impact of light pollution on birds has led to initiatives such as "Lights Out" campaigns. These campaigns encourage building owners and residents to turn off or dim lights during key migration periods to reduce the number of bird collisions. New York City, for instance, adopted a migratory-bird-friendly Lights Out policy in 2022, requiring city-owned and leased buildings to turn off outdoor lights between 11 p.m. and 6 a.m. Similar initiatives, such as "Lights Out Philly" and "Lights Out DC," have also been implemented in other cities to mitigate the impact of light pollution on bird populations.
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Solutions: voluntary guidelines and charters, or specific legislation
Hong Kong has been named the world's worst city for light pollution. Commercial and residential areas such as Mong Kok, Sham Shui Po, and Causeway Bay are among the most severely affected by light pollution. The bright neon lights and billboards in these areas have disrupted residents' sleep and affected the reproduction of fireflies in the remote Sai Kung countryside.
To address this issue, the Hong Kong government initiated a policy review in 2009, leading to the formation of the Task Force on External Lighting. The task force recommended against introducing rules or legislation, suggesting instead a voluntary "Charter on External Lighting." Under this charter, businesses are encouraged to turn off external lighting between 11:00 PM and 6:00 AM. However, this approach has been criticized as "toothless" by some.
In contrast, other cities and countries have implemented specific legislation to combat light pollution. For example, at least 19 states, the District of Columbia, and Puerto Rico in the United States have laws in place to reduce light pollution. These laws are often enacted to promote energy conservation, public safety, aesthetic interests, or astronomical research capabilities. Additionally, the entire country of New Zealand has pledged to become a dark sky reserve.
DarkSky International, a world-leading authority on light pollution, provides free templates for local and state/territorial laws that support responsible outdoor nighttime lighting. These templates are based on their Five Principles of Responsible Outdoor Lighting and aim to protect local character, enhance visual safety, and mitigate the harmful effects of light pollution. DarkSky also offers a review process to ensure that draft laws meet their template objectives and are enforceable.
By utilizing resources such as those provided by DarkSky International, cities and countries can develop effective legislation or voluntary guidelines to combat light pollution. While voluntary charters may be a starting point, specific legislation is often necessary to enforce meaningful change and protect the environment, human health, and astronomical research capabilities.
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Frequently asked questions
According to the Center for Biological Diversity, the city with the worst light pollution in the world is Saint Petersburg, Russia, where artificial lighting is 8.1 times brighter than the global urban average. However, other sources name Hong Kong as the world's worst city for light pollution.
Saint Petersburg's artificial lighting is 8.1 times brighter than the global urban average.
Hong Kong's light pollution problem has been recognised by the government, which initiated a policy review in 2009. This culminated in the 2011-2015 "Task Force on External Lighting" to investigate the problem, which recommended that no rules or legislation should be introduced. In 2016, the government introduced a voluntary "Charter on External Lighting", which suggested that businesses turn off external lighting between 11:00 pm and 6:00 am. However, this has been criticised as ineffective and "toothless".
