Light pollution in Estonia
3 cities · estimated Bortle class at each city centre
2 of 3 cities read Bortle 7–8 · 1 of 3 cities read Bortle 6–7.
The darkest city centre on the list is Narva (Bortle 6–7).
Cities, brightest first
# City Bortle (est.) Brightness 2 classes darker
1 Tallinn 7–8 255 ~25 km N 2 Tartu 7–8 255 ~25 km ENE 3 Narva 6–7 255 ~25 km NW
Brightness is the NASA VIIRS Black Marble 2016 value at the city centre on a 0–255 scale; 255 is saturated.
Cities are ordered by estimated sky brightness, which also counts the light within 30 km.
Night lights: NASA VIIRS Black Marble 2016 annual composite via NASA GIBS (public domain) · Cities and population: GeoNames (CC BY 4.0)
· Calibration: Globe at Night sky-quality-meter measurements 2014–2018 (CC BY 4.0, globeatnight.org)
· The Bortle class is our own estimate from upward night-light brightness, not an on-site sky-quality measurement.Digital Dynamics Kft. (EU)
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