Light pollution in Canada

106 cities · estimated Bortle class at each city centre

15 of 106 cities read Bortle 8–9 · 57 of 106 cities read Bortle 7–8 · 32 of 106 cities read Bortle 6–7 · 1 of 106 cities read Bortle 5–6 · 1 of 106 cities read Bortle 4–5. The darkest city centre on the list is Norfolk County (Bortle 4–5).

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Cities, brightest first

#	City	Bortle (est.)	Brightness	2 classes darker
1	West Humber-Clairville	8–9	255	~25 km SSE
2	Toronto	8–9	255	~25 km SE
3	Montréal	8–9	248	~25 km SSE
4	Vaughan	8–9	255	~25 km NW
5	Mississauga	8–9	251	~25 km SE
6	Edmonton	8–9	232	~25 km ESE
7	Calgary	8–9	255	~25 km SW
8	Pierrefonds-Roxboro	8–9	238	~25 km WNW
9	Winnipeg	8–9	255	~25 km NW
10	Ottawa	8–9	255	~25 km NW
11	Markham	8–9	221	~25 km SE
12	Vancouver	8–9	255	~25 km W
13	Québec	8–9	255	~25 km ENE
14	Hamilton	8–9	255	~25 km ENE
15	London	8–9	255	~25 km WNW
16	Niagara Falls	7–8	254	~25 km N
17	Kitchener	7–8	255	~25 km W
18	Surrey	7–8	211	~25 km SSW
19	Ajax	7–8	255	~25 km SSE
20	Milton	7–8	254	~25 km NW
21	Newmarket	7–8	255	~25 km NE
22	Repentigny	7–8	252	~25 km E
23	Oshawa	7–8	252	~25 km SE
24	Châteauguay	7–8	187	~25 km S
25	Regina	7–8	255	~25 km SSE
26	Saskatoon	7–8	255	~25 km SSW
27	Sarnia	7–8	253	~25 km NNE
28	Halifax	7–8	252	~25 km SSE
29	Saint-Jérôme	7–8	255	~25 km N
30	Coquitlam	7–8	210	~25 km NE
31	Delta	7–8	244	~25 km WSW
32	Cambridge	7–8	252	~25 km WSW
33	St. Catharines	7–8	255	~25 km NNE
34	Burlington	7–8	175	~25 km E
35	Orléans	7–8	244	~25 km NNW
36	Saint-Louis-de-Terrebonne	7–8	154	~25 km N
37	Guelph	7–8	255	~25 km N
38	Kanata	7–8	255	~25 km NW
39	Sherbrooke	7–8	255	~25 km NNE
40	Saint-Jean-sur-Richelieu	7–8	255	~25 km S
41	Georgetown	7–8	230	~25 km WNW
42	Kelowna	7–8	255	~25 km W
43	Welland	7–8	236	~25 km SSW
44	Brantford	7–8	246	~25 km SW
45	Greater Sudbury	7–8	249	~25 km SW
46	Medicine Hat	7–8	252	~25 km NNE
47	Moncton	7–8	255	~25 km SSE
48	Red Deer	7–8	253	~25 km NNW
49	Saguenay	7–8	255	~25 km E
50	Trois-Rivières	7–8	249	~25 km SW
51	Lethbridge	7–8	250	~25 km NE
52	Salaberry-de-Valleyfield	7–8	253	~25 km SSW
53	Lower Sackville	7–8	221	~25 km WNW
54	Victoria	7–8	255	~25 km ESE
55	Grande Prairie	7–8	249	~25 km SE
56	St. John's	7–8	255	~25 km ESE
57	Joliette	7–8	233	~25 km NW
58	Barrie	7–8	202	~25 km E
59	Abbotsford	7–8	228	~25 km NNE
60	Saint-Hyacinthe	7–8	255	~25 km ESE
61	Thunder Bay	7–8	251	~25 km ESE
62	Sault Ste. Marie	7–8	247	~25 km NW
63	Drummondville	7–8	201	~25 km E
64	Granby	7–8	250	~25 km SE
65	Kamloops	7–8	209	~25 km NE
66	Leamington	7–8	252	~25 km SE
67	Woodstock	7–8	253	~25 km WNW
68	St. Thomas	7–8	255	~25 km S
69	Peterborough	7–8	233	~25 km NNE
70	Saint John	7–8	240	~25 km SSE
71	Brandon	7–8	248	~25 km NNW
72	Chestermere	7–8	136	~25 km NE
73	Sorel-Tracy	6–7	248	~25 km NNW
74	Sydney	6–7	255	~25 km N
75	Victoriaville	6–7	224	~25 km ESE
76	Chatham	6–7	234	~25 km SSE
77	Orillia	6–7	254	~25 km SSE
78	Spruce Grove	6–7	177	~25 km W
79	Prince George	6–7	255	~25 km ESE
80	Cornwall	6–7	230	~25 km ENE
81	Airdrie	6–7	184	~25 km WNW
82	Lloydminster	6–7	247	~25 km ENE
83	Chilliwack	6–7	253	~25 km NNE
84	Belleville	6–7	255	~25 km SW
85	Kingston	6–7	198	~25 km S
86	Okotoks	6–7	218	~25 km WSW
87	Shawinigan	6–7	223	~25 km NNW
88	Cochrane	6–7	247	~25 km SW
89	Moose Jaw	6–7	240	~25 km SW
90	Prince Albert	6–7	228	~25 km WSW
91	Fort McMurray	6–7	219	~25 km NE
92	North Bay	6–7	248	~25 km WSW
93	Rimouski	6–7	255	~25 km N
94	Fredericton	6–7	198	~25 km NNE
95	Charlottetown	6–7	227	~25 km SSW
96	Saint-Georges	6–7	254	~25 km ENE
97	Stratford	6–7	208	~25 km NNW
98	Vernon	6–7	254	~25 km W
99	Timmins	6–7	241	~25 km E
100	Penticton	6–7	255	~25 km E
101	Nanaimo	6–7	171	~25 km NNW
102	Quinte West	6–7	218	~25 km SSW
103	Caledon	6–7	127	~25 km SW
104	Campbell River	6–7	175	~25 km ESE
105	Mirabel	5–6	42	~25 km NW
106	Norfolk County	4–5	21	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.