Light pollution in Japan

80 cities · estimated Bortle class at each city centre

28 of 80 cities read Bortle 8–9 · 47 of 80 cities read Bortle 7–8 · 4 of 80 cities read Bortle 6–7 · 1 of 80 cities read Bortle 1–4. The darkest city centre on the list is Shinagawa (Bortle 1–4).

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Cities, brightest first

#	City	Bortle (est.)	Brightness	2 classes darker
1	Tokyo	8–9	255	~25 km SE
2	Fuchū	8–9	255	~25 km W
3	Sōka	8–9	255	~50 km S
4	Osaka	8–9	255	~25 km SW
5	Edogawe	8–9	255	~25 km S
6	Minamirinkan	8–9	255	~25 km W
7	Nagoya	8–9	255	~25 km ENE
8	Saitama	8–9	243	~25 km NE
9	Hirakata	8–9	252	~25 km E
10	Yokohama	8–9	255	~25 km ENE
11	Kashiwa	8–9	255	~25 km E
12	Kawagoe	8–9	255	~25 km W
13	Chiba	8–9	255	~25 km S
14	Fujisawa	8–9	254	~25 km S
15	Takarazuka	8–9	255	~25 km N
16	Sapporo	8–9	255	~25 km NNW
17	Toyota	8–9	255	~25 km E
18	Fukuoka	8–9	255	~25 km NNW
19	Aihara	8–9	235	~25 km WSW
20	Sendai	8–9	255	~25 km ESE
21	Isesaki	8–9	249	~25 km N
22	Nara-shi	8–9	240	~25 km SE
23	Kyoto	8–9	255	~25 km NNW
24	Kobe	8–9	247	~25 km SSW
25	Toyohashi	8–9	255	~25 km SSE
26	Hamamatsu	8–9	255	~25 km S
27	Takasaki	8–9	254	~25 km WNW
28	Gifu	8–9	233	~25 km N
29	Ōta	7–8	194	~25 km NNE
30	Kurume	7–8	255	~25 km ESE
31	Utsunomiya	7–8	249	~25 km W
32	Hiroshima	7–8	255	~25 km WNW
33	Yokkaichi	7–8	255	~25 km SSE
34	Tsukuba	7–8	244	~25 km E
35	Akashi	7–8	254	~25 km WSW
36	Yokosuka	7–8	255	~25 km S
37	Naha	7–8	255	~25 km W
38	Toyama	7–8	255	~25 km N
39	Okayama	7–8	239	~25 km ESE
40	Himeji	7–8	219	~25 km S
41	Kanazawa	7–8	247	~25 km NNW
42	Kumamoto	7–8	233	~25 km WSW
43	Kishiwada	7–8	159	~25 km W
44	Mito	7–8	236	~25 km ESE
45	Kurashiki	7–8	219	~25 km SSW
46	Shizuoka	7–8	241	~25 km SE
47	Takamatsu	7–8	252	~25 km ENE
48	Ōita	7–8	249	~25 km NE
49	Kōriyama	7–8	255	~25 km WNW
50	Kagoshima	7–8	255	~25 km SSE
51	Tsu	7–8	226	~25 km ESE
52	Fukuyama	7–8	249	~25 km S
53	Minato	7–8	225	~25 km WSW
54	Fuji	7–8	253	~25 km S
55	Asahikawa	7–8	255	~25 km ESE
56	Tokushima	7–8	220	~25 km ESE
57	Niigata	7–8	234	~25 km WNW
58	Matsuyama	7–8	255	~25 km WSW
59	Kitakyushu	7–8	140	~25 km NNW
60	Nagano	7–8	237	~25 km NW
61	Morioka	7–8	252	~25 km NW
62	Fukushima	7–8	247	~25 km E
63	Hakodate	7–8	253	~25 km SSW
64	Akita	7–8	255	~25 km SW
65	Fukui-shi	7–8	255	~25 km W
66	Miyazaki	7–8	245	~25 km SE
67	Nagasaki	7–8	247	~25 km SW
68	Matsumoto	7–8	251	~25 km W
69	Sasebo	7–8	236	~25 km WSW
70	Aomori	7–8	246	~25 km NNE
71	Kochi	7–8	204	~25 km S
72	Saga	7–8	154	~25 km S
73	Hachinohe	7–8	212	~25 km ENE
74	Iwaki	7–8	209	~25 km E
75	Nagaoka	7–8	229	~25 km NW
76	Suginami	6–7	178	~25 km SSE
77	Kure	6–7	157	~25 km SW
78	Matsue	6–7	192	~25 km NNE
79	Yamagata	6–7	82	~25 km WNW
80	Shinagawa	1–4	13	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.