Light pollution in Finland

20 cities · estimated Bortle class at each city centre

1 of 20 cities read Bortle 8–9 · 17 of 20 cities read Bortle 7–8 · 2 of 20 cities read Bortle 6–7. The darkest city centre on the list is Salo (Bortle 6–7).

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Cities, brightest first

#	City	Bortle (est.)	Brightness	2 classes darker
1	Helsinki	8–9	255	~25 km S
2	Espoo	7–8	245	~25 km S
3	Turku	7–8	255	~25 km SSW
4	Lahti	7–8	255	~25 km SSW
5	Tampere	7–8	255	~25 km N
6	Jyväskylä	7–8	255	~25 km W
7	Oulu	7–8	255	~25 km NW
8	Kouvola	7–8	255	~25 km NE
9	Kuopio	7–8	255	~25 km ESE
10	Lappeenranta	7–8	255	~25 km N
11	Joensuu	7–8	255	~25 km S
12	Pori	7–8	255	~25 km W
13	Kotka	7–8	255	~25 km SSW
14	Rovaniemi	7–8	255	~25 km ESE
15	Porvoo	7–8	254	~25 km S
16	Seinäjoki	7–8	243	~25 km ESE
17	Hämeenlinna	7–8	254	~25 km NNW
18	Vaasa	7–8	255	~25 km WSW
19	Mikkeli	6–7	255	~25 km ESE
20	Salo	6–7	255	~25 km SE

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.