Light pollution in Tanzania

23 cities · estimated Bortle class at each city centre

1 of 23 cities read Bortle 8–9 · 5 of 23 cities read Bortle 7–8 · 13 of 23 cities read Bortle 6–7 · 4 of 23 cities read Bortle 5–6. The darkest city centre on the list is Kasulu (Bortle 5–6).

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Cities, brightest first

#	City	Bortle (est.)	Brightness	2 classes darker
1	Dar es Salaam	8–9	255	~25 km ENE
2	Dodoma	7–8	252	~25 km ESE
3	Mbeya	7–8	244	~25 km SE
4	Arusha	7–8	223	~25 km ENE
5	Mwanza	7–8	234	~25 km NNW
6	Morogoro	7–8	254	~25 km S
7	Kahama	6–7	230	~90 km W
8	Tabora	6–7	222	~50 km NW
9	Iringa	6–7	217	~25 km ESE
10	Singida	6–7	209	~90 km SSW
11	Zanzibar	6–7	231	~25 km WNW
12	Geita	6–7	212	~25 km NW
13	Tunduma	6–7	214	~50 km W
14	Moshi	6–7	195	~25 km N
15	Tanga	6–7	185	~25 km SE
16	Ifakara	6–7	165	~25 km NNW
17	Mpanda	6–7	160	~25 km WNW
18	Sumbawanga	6–7	141	~25 km E
19	Songea	6–7	134	~25 km S
20	Kibaha	5–6	84	~50 km NNE
21	Bariadi	5–6	97	~90 km NW
22	Kigoma	5–6	124	~25 km SSW
23	Kasulu	5–6	113	~90 km SW

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.