Every human who lived before about 1880 could walk outside on a clear, moonless night and see our own galaxy overhead. Then we switched the lights on. The New World Atlas of Artificial Night Sky Brightness — built from satellite radiometry and tens of thousands of ground measurements — is the first global map of what we lost, and of the shrinking places where the Milky Way is still there to be seen.
1 in 3Humans
More than one-third of humanity cannot see the Milky Way from where they live — including 60% of Europeans and nearly 80% of North Americans. Skyglow does not respect borders: it is a dome of scattered light that spills hundreds of kilometres past the last streetlamp. FALCHI ET AL., SCIENCE ADVANCES, 2016
Artificial skyglow — Milky Way lostPristine or near-pristine night skyLabels & figures: real. Outlines: hand-simplified.
Glow blooms are drawn schematically over the world's brightest urban regions; dashed rings mark the largest surviving dark refuges. Every named place and every number on the map is sourced below.
01 — The threshold
The sky doesn't switch off. It fades.
Falchi's atlas is built on two hard lines. A sky counts as light-polluted once artificial brightness at the zenith exceeds 14 μcd/m² — roughly 8% above the natural background. The Milky Way disappears much later, at 688 μcd/m², about fifty times further along the scale. Between those two numbers sit most of the world's people.
Artificial zenith brightness → what you can still see
Pristine · Bortle 1RuralSuburbanCity edgeInner city · Bortle 9
14 μcd/m² Light pollution begins — 8% above the natural night sky. Over 80% of the world's population already lives past this line.
688 μcd/m² The Milky Way is gone. The natural appearance of the sky is lost entirely.
Bortle 1 → 9 On John Bortle's field scale, a Class 1 site reaches naked-eye magnitude 7.6–8.0; Class 9 is an inner city where only the brightest planets survive.
Because scattering is atmospheric, brightness falls off gradually with distance rather than stopping at a city limit — which is why the map's glow blooms are so much larger than the cities that make them.
02 — Land versus people
A quarter of the land. Four-fifths of the population.
Light pollution is concentrated exactly where people are, so the population figure runs far ahead of the land figure. That gap is the whole story of the map: there is still a lot of dark Earth — almost nobody lives on it.
Share of land surface with light-polluted nights
World 75°N–60°S23%
United States~47%
Europe88%
Share of population living under polluted skies
World>80%
United States>99%
Europe>99%
And for the galaxy specifically: the Milky Way is invisible to more than 33% of humanity, 60% of Europeans and ~80% of North Americans. The atlas behind these numbers was computed from VIIRS Day/Night Band satellite radiance and calibrated against more than 30,000 ground-based sky-brightness measurements.
03 — Where the eye never adapts
Skies too bright for human night vision
Beyond the Milky Way threshold lies a further category: skies so bright that the human eye never fully switches to scotopic vision — you stay in permanent twilight adaptation, all night, every night. In Singapore that describes the entire population.
Share of population that cannot fully dark-adapt at night
Singapore100%
Kuwait98%
Qatar97%
U. Arab Emirates93%
Saudi Arabia83%
South Korea66%
Israel61%
Argentina58%
Libya53%
Trinidad & Tobago50%
Look at where these countries sit on the map: small, hot, densely lit, and — in the Gulf — surrounded by desert that would otherwise be some of the darkest terrain on Earth. Geography did not doom them. Lighting design did.
04 — How far you'd have to drive
900 kilometres to a clean zenith
The atlas lets you ask a very concrete question: from here, how far to a sky that is essentially untouched? For Paris, the answer is a road trip.
900 km
From Paris
The nearest large territories with an essentially unpolluted zenith are Corsica, central Scotland, or Cuenca province in Spain.
Cairo
The worst case on Earth
The Nile Delta is the location on the planet most distant from any hint of a Milky Way view — the single furthest point from a dark sky anywhere.
>75%
Chad · C.A.R. · Madagascar
The three countries where more than three-quarters of inhabitants still live under pristine sky conditions.
Trace the dashed rings on the map and a pattern appears: the surviving dark places are deserts, boreal forest, high plateau, ocean-facing wilderness and the interiors of large, thinly populated states. They are dark because nobody is there — which is precisely why they are so easy to lose.
05 — The trend
The sky is brightening about 10% a year
Satellites said light pollution was growing slowly. Human eyes said otherwise. Between 2011 and 2022, more than 50,000 naked-eye star counts submitted to the Globe at Night citizen-science project showed night-sky brightness rising by 9.6% per year — a doubling in under eight years.
Annual increase in night-sky brightness, 2011–2022
North America10.4%
Global average9.6%
Europe6.5%
Satellite, lit area2.2%
Satellites undercount: VIIRS is largely blind to the blue-rich light emitted by white LEDs, so the ground-truth human measurement runs roughly four times higher than the orbital one.
Stars visible to one person over one childhood
Illustrative projection. A child born where 250 stars are visible would see roughly 100 from the same spot on their 18th birthday, at the measured 9.6%/yr rate. The endpoints are from the study; the curve between them is drawn for illustration.
06 — Defending the dark
Two hundred and fifty places, deliberately kept dark
Light pollution is the rarest kind of environmental damage: it disappears the instant you switch the source off. There is no residue, no half-life. That makes protected dark-sky reserves unusually effective — and unusually cheap.
250
Certified places
International Dark Sky Places certified by DarkSky International as of 2025 — the 250th was Lapalala Wilderness, South Africa.
160,000 km²
Protected night
Land under dark-sky protection across 22 countries on 6 continents, with 22 new places added in 2025 alone.
4,367 km²
Aoraki Mackenzie, NZ
The first Gold-tier reserve in the Southern Hemisphere — visible on the map as the dark ring over New Zealand's South Island.
What to notice on the map
The glow is bigger than the city. Every bloom extends far past its built-up area, because skyglow is scattered light in the atmosphere above you, not light on the ground near you. That is why a village 80 km from a metropolis can still have a ruined zenith.
Cairo is not the brightest place — it's the most trapped. Being the point farthest from any Milky Way view is a statement about geography, not wattage: the Nile corridor is a long, continuous ribbon of light with no dark exit nearby.
The Gulf breaks the desert rule. Deserts are usually dark; Kuwait, Qatar and the UAE are among the most light-saturated populations on Earth. Development pattern beats terrain.
The dark refuges are empty, not protected. Chad, the Amazon interior, the Outback, Siberia and boreal Canada stay dark by absence of people. Only a tiny fraction — those 250 certified places — is dark by decision.
This map is already out of date, in one direction. The atlas is a 2016 snapshot; measured brightening since then has run near 10% per year. Every bloom you see should be read as a minimum.