Bright Lights, Fading Skies: The Environmental Toll of Light Pollution

Bright Lights, Vanishing Stars: The Hidden Environmental Cost of Light Pollution

Pradakshina Sarmah

Light pollution refers to excessive, enormous and unnecessary use of artificial light in the form of outdoor lighting sources that has adverse effects on the environment, lifestyle, wildlife, astronomy, etc.

Despite the grave consequences of unchecked and hazardous use of different forms of artificial lighting sources, whether indoor or outdoor, the general population has little to no awareness about this type of pollution that they are being exposed daily. Many research studies confirm the presence and effects of air, water, soil and noise pollution, but only a few sources discuss the environmental threat of light pollution.

Astronomical light pollution refers to the difficulties in viewing the night sky and observing celestial objects because of artificial illumination during night time. This issue has been stressed by many astronomical agencies and centers like IDA (International Dark-Sky Association) since the early 20^thcentury. IDA also gave an official definition which states light pollution as an adverse effect of artificial light that includes skyglow, glare, light trespass, light clutter, decreased visibility at night, and energy waste. Many kinds of research have found out various factors and consequences linked to this pollution, stating that the situation will worsen over time.

Most environmental pollution on Earth comes from humans and their inventions. Forexample, the automobile or that miraculous human-made material, plastic. Today, automobile emissions are a major source of air pollution contributing to climate change, and plastics fill our ocean, creating a significant health hazard to marine animals.

And what about the electric lightbulb, thought to be one of the greatest human inventions of all time? Electric light can be a beautiful thing, guiding us safe and making our homes cozy and bright. However,toomuch of a good thing has started to negatively impact the environment Light pollution, the excessive or inappropriate use of outdoor artificial light, is affecting human health, wildlife behavior, and our ability to observe stars and other celestial objects.

Most of us are familiar with air pollution, waterpollution, and land pollution, but did you know that light can also be a pollutant?

What Causes Light Pollution?

Light pollution is mainly caused by excessive, misdirected, or poorly planned artificial lighting from human activities such as streetlights, vehicles, advertising boards, and residential or commercial lighting. It disrupts natural darkness, wastes energy, and affects ecosystems and human health.

Key Causes of Light Pollution

Streetlights & Vehicle Lights

Overuse of bright streetlights and constant vehicle headlights contribute heavily to skyglow and glare.

Residential & Commercial Lighting

Homes, shoppingmalls, restaurants, and gaming zones often use unnecessary or overly bright lights that spill into the night sky.

Billboards & Advertisements

Illuminated hoardings, electronicdisplays, and commercial ads create intense localized light pollution.

Sports Stadiums & Public Venues

Floodlights used in night sports events or large gatherings generate massive amounts of light, often left on longer than needed.

Dense Urban Population
Cities with high population density naturally produce more artificial light due to increased infrastructure and activity.

Improper Planning

Poorly designed lighting systems that don’t direct light downward or use excessive brightness worsen the problem.

Reckless Use of Lights

Leaving lights on unnecessarily, using decorative lighting excessively, or failing to adopt energy-efficient practices adds to pollution.

How bad is light pollution?

With much of the Earth’s population living under light polluted skies, over lighting is an international concern.

          According to the 2016 groundbreaking “World Atlas of Artificial Night SkyBrightness,” 80 percent of the world’s population lives under sky glow. In the United States and Europe,99% of the public can’t experience a natural light.

Bad side of Lighting

Lighting negatively affects the environment as it disrupts the natural light cycles that species are cued into. These include changes in time partitioning such as birds’singingactivity and foraging in animals, or altering individual health.

And there’s increasing evidence that lighting has negative effects on human health. Melatonin is the hormone that regulates human sleep patterns and is expressed under light. Changes in light regimes away from day-night cycles caused by light pollution means that it can disrupt this vital hormone’s natural expression. This has been linked to obesity, reduced sleep quality and impaired memory. Melatonin is an anti-oxidant that can remove free radicals, the disruption of its expression by artificial light may increase cancer risk. Disruption of natural light cycles is particularly acute with newer LED (Light Emitting Diode) lights, which are increasingly being adopted globally for their energy efficiency benefits. Yet, there’s little consideration of their negative health consequences.

Every day needs a night

All around us, this unintended pollutant is taking a silent toll. Each year, thousands of migrating birds and shorebirds are killed because of unnecessary artificial light at night. Light pollution threatens aquatic ecosystems by increasing the risk of harmful algae blooms. It also impacts our quality of life by eradicating our access to the wonder of beautiful night skies.

Sustainable Solutions to mitigate Night Pollution

     Light pollution is something we can all help erase, in our homes and backyards, the parks that we play in, and the cities and town we call home. To mitigate the issue of light pollution, a range of targeted strategies and actions are taken into consideration. They are provided below:

1.LEDs and compact fluorescents (CFLs) can help reduce energy use and protect the environment, but only warm-colored bulbs should be used.

2.Dimmers, motionsensors, and timers can help to reduce average illumination levels and save even more energy.

3.Outdoor lighting fixtures that shield the light source to minimize glare and light trespass help prevent light pollution.

4.Switching to LED lighting allows for reduced illuminance without compromising visibility.

5.Unnecessary indoor lighting- particularly in empty office buildings at night- should be turned off. This will help prevent leakage of interior light into the night sky.

6.The use of blue lights at night should be avoided:

a.Outdoor lighting with strong blue content is likely to worsen sky glow because it has significantly larger geographic reach than lighting consisting of less blue.

b. Blue-rich white light sources are also known to increase glare and compromise human vision, especially in the aging eye. These lights create potential road safety problems for motorists and pedestrians alike. In natural settings, blue light at night has been shown to adversely affect wildlife behavior and reproduction. This particularly true in cities, which are often stopover points for migratory species.

c. “Warm” toned or filtered LEDs (CCT 3000 K or lower;S/P ratio 1:2 or lower) should be used to minimize blue emission.

Several significant initiatives have been implemented or proposed in early 2026 to mitigate light pollution, focusing on policy, technology, and regional dark sky protection:

Kerala State Policy Workshop (India-March 2026): The Kerala State Pollution Control Board inaugurated a policy formulation workshop, “Sam Rambha Sauhrida Nirmala Keralam 2026,” directed by the State Government to frame an integrated strategy to curb light pollution.

Assam Dark Sky Parks Initiative (India-February 2026): The Assam state government, through its Science, Technology and Climate Change Department, initiated plans to designate areas like Kaziranga and Manas National Parks as dark sky parks, with in-principal cabinet approval.

Morni Hills Dark Sky Reserve (Haryana, India-Early 2026):Morni Hills in Haryana was officially declared the state’s first ‘Dark Sky Reserve ‘pilot in early 2026 to promote astro-tourism and reduce light pollution.

Earth Hour 2026(March 28,2026): The20^th anniversary of this global initiative saw millions switching off non-essential lights to raise awareness about climate change, energyconservation, and light pollution, with major events in India and worldwide.

ADRISKY Project (Adriatic-Ionian Region-Ongoing 2026): As of January 2026, this ongoing project (running until August 2027)

is developing, testing, and implementing strategies to mitigate light pollution and protect nocturnal biodiversity.

National Lighting Code of India 2025/2026: Implementation of the NLC 2025/2026 by the Bureau of Indian Standards (BIS) continues to be promoted, providing guidelines on shielded lighting, BUGratings (Backlight, Uplight, Glare), and restricting upward light.

Light pollution is more than just an inconvenience – it’s a growing environmental issue with wide-ranging consequences. It disrupts ecosystems, wastes energy, obscures our view of the night sky, and negatively impacts human health.

Light pollution is preventable. By adopting smarter lighting practices such as shielding outdoor lights, using energy-efficient bulbs, and reducing unnecessary illumination we can restore balance between human activity and natural world. Protecting the night sky is not just about science and aesthetics; it’s about safeguarding biodiversity, conserving energy, and preserving a vital part of our shared heritage.

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