Global Light Pollution Map
Explore Earth at night through satellite imagery and discover how artificial light affects our night sky
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VIIRS Satellite Light Pollution Data
This map displays artificial night light data captured by NASA's Visible Infrared Imaging Radiometer Suite (VIIRS). Areas with higher light pollution are shown in yellow, orange, and red.
Light Pollution Scale
The Bortle scale is a nine-level numeric scale that measures the night sky's brightness at a particular location.
About Light Pollution
Light pollution is the presence of unwanted, inappropriate, or excessive artificial light. It's a form of environmental pollution that can have serious environmental consequences for humans, wildlife, and climate.
The data shown in this map comes from the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard the Suomi NPP satellite, which captures high-resolution imagery of Earth's light emissions at night.
Areas with the brightest light pollution (shown in red and white) have the most significant impact on astronomical observations, circadian rhythms of living beings, and energy consumption.
Dark sky areas (shown in dark blue or black) are optimal for stargazing and astronomical photography.
Reducing light pollution helps conserve energy, protect wildlife, and restore our connection to the night sky.
Key Facts
Global Impact
More than 80% of the world's population lives under light-polluted skies, with over one-third unable to see the Milky Way even on the clearest nights.
Energy Waste
It's estimated that at least 30% of outdoor lighting in the U.S. alone is wasted, costing over $3.3 billion annually and emitting 21 million tons of carbon dioxide.
Wildlife Effects
Artificial light disrupts ecosystems by confusing animal navigation, altering competitive interactions, changing predator-prey relations, and affecting animal physiology.
Understanding Light Pollution
What Causes Light Pollution?
Light pollution is excessive, misdirected, or obtrusive artificial light produced by human activities. The main sources include:
- •Skyglow: The brightening of the night sky over inhabited areas due to streetlights and other artificial light sources
- •Glare: Excessive brightness that causes visual discomfort and decreases visibility
- •Light Trespass: Light falling where it's not intended or needed, such as streetlights shining into homes
- •Clutter: Excessive groupings of light sources that generate confusion and distract from the night environment
Impact on Human Health
Exposure to artificial light at night has been linked to several health issues:
- •Disrupted Circadian Rhythm: Artificial light suppresses melatonin production, affecting sleep patterns and quality
- •Increased Risk of Disease: Studies show correlations between light at night and increased risks of cancer, diabetes, obesity, and depression
- •Sleep Disorders: Exposure to blue light from screens and LED lighting can significantly disrupt sleep quality
- •Psychological Effects: Reduced access to natural darkness can impact mental health and increase stress levels
Environmental Impact
Light pollution disrupts ecosystems by confusing animal navigation, altering predator-prey relationships, affecting plant growth cycles, and disrupting nocturnal pollination. Sea turtles, migratory birds, and nocturnal mammals are particularly vulnerable to these changes.
Astronomical Consequences
Light pollution severely limits our ability to observe celestial objects. In urban areas, as few as a dozen stars may be visible compared to thousands in truly dark skies. This has profound implications for astronomical research, education, and our cultural connection to the night sky.
Energy Waste
Inefficient lighting that spills into the sky wastes an estimated $3 billion in electricity annually in the United States alone. This unnecessary consumption contributes to greenhouse gas emissions and climate change, making light pollution an environmental and economic concern.
Mercury 91's Light Pollution Mapping Technology
Satellite Integration
Mercury 91 utilizes NASA's Visible Infrared Imaging Radiometer Suite (VIIRS) data from the Suomi NPP satellite to provide the most accurate and up-to-date light pollution mapping available. This advanced technology captures nighttime light emissions across the entire globe with unprecedented precision.
Our proprietary algorithms process this raw satellite data to generate user-friendly visualizations that help users understand light pollution levels in their area and around the world.
Bortle Scale Integration
Mercury 91's light pollution map incorporates the Bortle Dark-Sky Scale, a nine-level numeric scale that measures the night sky's brightness and the impact of light pollution on astronomical visibility at specific locations.
This integration allows users to quickly identify optimal stargazing locations and understand how light pollution affects astronomical observations in their area, supporting both amateur astronomers and professional researchers.
Frequently Asked Questions
How accurate is the light pollution map?
Mercury 91's light pollution map utilizes the latest satellite data from NASA's VIIRS instruments. The map is updated regularly and provides approximately 750m resolution globally. While this provides excellent large-scale accuracy, local variations caused by topography, new developments, or recent lighting changes may not be immediately reflected.
How can I find dark sky locations for stargazing?
Using our light pollution map, look for areas colored in black, dark blue, or blue (Bortle scale 1-3). These represent the darkest skies with minimal light pollution. You can use the search function to find specific locations or explore the map to discover dark sky areas near you. For the best experience, we recommend traveling to officially designated Dark Sky Places, which are marked on our map.
What can I do to reduce light pollution?
There are several effective steps you can take: Use fully shielded light fixtures that direct light downward, install motion sensors so lights are only on when needed, use warmer colored lights (lower Kelvin ratings) which have less impact on wildlife and human health, and turn off unnecessary outdoor lighting when not in use. You can also advocate for responsible lighting ordinances in your community.
How does Mercury 91 help with light pollution awareness?
As part of Mercury 91's Cosmic Social Operating System, our light pollution mapping tool raises awareness about this growing environmental issue. By providing accessible, visual data on light pollution, we help users understand its impact on astronomy, wildlife, and human health. Mercury 91 also integrates this information with our other cosmic features, connecting light pollution awareness with our broader mission of fostering a deeper connection with the universe.
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