Light Pollution Has Reached Earth's Darkest Places — Here's What That Means for Outdoor Lighting
Skies are brightening by nearly 10% per year. Even Chile's Atacama Desert — home to the world's most powerful telescopes — is under threat. The problem is global. The solutions are practical, and available right now.
One of the Darkest Places on Earth Is Getting Brighter
Chile's Atacama Desert sits at 2,600 meters above sea level, more than 130 kilometers from the nearest city. There are no visible signs of human settlement in any direction — only desert and the Pacific Ocean on the horizon. It is, by almost any measure, one of the last genuinely dark places on Earth. It is also, for precisely that reason, home to some of the world's most powerful telescopes, including the European Southern Observatory's Very Large Telescope and the Extremely Large Telescope, due to be fully operational by 2029.
BBC Future journalist Richard Fisher visited Paranal Observatory in May 2026 and reported something that should concern anyone involved in outdoor lighting decisions: even here, the dark is under threat. Industrial mining operations and energy facilities are moving closer. A proposed megaproject known as the Inna complex was recently withdrawn — not because of scientists' objections, but because of other business priorities. With no change to Chile's light pollution regulations, astronomers warn that a follow-up project could be submitted during 2026, triggering the same crisis again.
What happens in the Atacama is a compressed version of what is happening everywhere. The problem is not isolated. It is a global trajectory — and the Atacama is simply one of the last places where the consequences are visible in sharp relief.
"Fifty years ago, there were abundant dark skies in the world. What was once abundant is now becoming extremely scarce. These are endangered environments and we're about to lose them, if we do not protect them."
— Eduardo Unda-Sanzana, Astronomer, University of Antofagasta (BBC Future, May 2026)
The Numbers Behind the Problem
A study of global star visibility found that skies brightened due to light pollution by nearly 10% per year on average between 2011 and 2022. To put that in human terms: a person who could see 250 stars at the start of that period would see only 100 by the end. In just over a decade, more than half of visible stars vanished — not because of anything happening in space, but because of choices made about how we light streets, parking lots, storefronts, sports fields, and industrial facilities here on Earth.
Today, 80% of the world's population lives under light-polluted skies. Two-thirds of the world's major telescopes have already exceeded the critical 10% threshold above natural light levels that astronomers identified in the 1970s as the point at which sky glow severely impacts ground-based observations. The Atacama remains below that threshold — barely — and researchers are fighting to keep it that way.
Light Pollution as a "Hard" Pollutant
Some researchers now argue that excess artificial light should be classified as a "hard" pollutant, comparable to chemical pollution of air or water. The BBC Future report documents several mechanisms through which this plays out:
- Human health: Artificial light suppresses melatonin and disrupts the circadian rhythm, raising risk of metabolic disorders including diabetes, depression, and obesity. The colder and whiter the light, the stronger the effect.
- Wildlife behavior: Animals and plants evolved over millions of years in response to natural light. When artificial light tricks them into believing it is daytime, it disrupts behavior and physiology at the ecosystem level — from migratory birds losing their navigational cues to insects dying in their billions around light sources each year.
- Plant physiology: Artificial light at night affects how plants sense and respond to their environment, with downstream effects on ecosystems dependent on those plants.
- Mental wellbeing: Psychologists have suggested that the disappearance of visible stars could worsen human mental wellbeing by severing a long-term connection to the natural world that has existed for the entire history of our species.
The Threshold Problem — and What It Means for Industrial and Commercial Lighting
One of the most instructive details in the BBC Future report is what astronomers call the "threshold problem." Under current Chilean regulations, an industrial facility can receive approval to build as long as it does not increase light pollution at a given site by more than 10% above natural levels — a standard that dates to the 1970s. The problem is twofold.
First, that threshold was set before sites like Paranal existed. For the world's most sensitive observatories, even a 1% increase is damaging. As astronomer Unda-Sanzana told BBC Future: "If you allow for 10%, you basically destroy the site."
Second, the threshold applies to individual facilities in isolation. Two separate projects could each win approval independently, while their combined light output exceeds the limit with no mechanism to intervene. "The collective effect of the lights could still ruin the sky," Unda-Sanzana explained.
This is precisely the logic that applies to any commercial or municipal lighting installation, even far from an observatory. Individual fixtures that are technically within local specifications can collectively produce sky glow, light trespass, and ecological disruption that no single fixture would be held accountable for. The solution is not to meet the minimum threshold — it is to specify correctly from the outset.
"Astronomical observatories can be seen as the proverbial canary in a coal mine. If we are not able even to keep the canary alive, then we can forget being able to solve the problem of light pollution as a global environmental issue."
— Researchers cited in BBC Future, May 2026
What Correct Specification Looks Like in Practice
The BBC Future report identifies the same practical measures that Access Fixtures lighting specialists recommend for any outdoor installation near sensitive environments — parks, coastal areas, residential neighborhoods, wildlife habitat, or observatory protection zones.
Five Principles for Responsible Outdoor Lighting
How Access Fixtures Supports Dark Sky Friendly Outdoor Lighting
The principles that astronomers are fighting to protect in the Atacama are the same principles that govern responsible outdoor lighting anywhere. Access Fixtures engineers and lighting specialists apply them to parking lots, sports fields, parks, municipal streetscapes, coastal facilities, and industrial sites across the US — without sacrificing the performance those applications demand.
Access Fixtures Products and Services for Responsible Outdoor Lighting
A Lighter World Is Not Necessarily a Brighter One
That line belongs to BBC Future journalist Richard Fisher, writing from Paranal at 2:00 in the morning beneath a sky dense with stars. It is as good a summary of the light pollution problem as any researcher has produced.
The Atacama Desert's fight to preserve its darkness is not an astronomy story. It is a story about what happens when the cumulative effect of individually approved, individually reasonable lighting decisions adds up to an environment that no one deliberately chose to create. Two-thirds of humanity has already lost regular access to a genuinely dark sky. The remaining third is shrinking.
The decisions that determine which side of that line a given community falls on are made one project at a time — one parking lot, one sports field, one streetscape, one industrial facility. Access Fixtures lighting specialists can help you make those decisions with full information: the right fixture, the right spectrum, the right controls, and a photometric study that shows exactly what your installation will produce before a single post goes in the ground.
Call us at 800-468-9925 or request a photometric study to get started.
Source: Fisher, R. (2026, May 28). "Chile's Atacama Desert is one of the darkest places on Earth. But now the light is intruding." BBC Future. DarkSky International: darksky.org. European Southern Observatory: eso.org.