Light pollution in Austria

8 cities · estimated Bortle class at each city centre

1 of 8 cities read Bortle 8–9 · 4 of 8 cities read Bortle 7–8 · 2 of 8 cities read Bortle 6–7 · 1 of 8 cities read Bortle 4–5. The darkest city centre on the list is Eisenzicken (Bortle 4–5).

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Cities, brightest first

#	City	Bortle (est.)	Brightness	2 classes darker
1	Vienna	8–9	255	~25 km WSW
2	Linz	7–8	239	~25 km ENE
3	Graz	7–8	255	~25 km NW
4	Salzburg	7–8	251	~25 km WSW
5	Innsbruck	7–8	255	~25 km N
6	Klagenfurt am Wörthersee	6–7	253	~25 km SE
7	Villach	6–7	227	~25 km NW
8	Eisenzicken	4–5	23	not within 90 km

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.