Most polluted cities in Canada

96 measured cities ranked by PM2.5, last 7 days. Worst: Calgary at 8.7 µg/m³, #760 in the world.

#	City	µg/m³
1	Calgary Alberta	8.7
2	Chilliwack British Columbia	8.1
3	Red Deer Alberta	8.0
4	Saint-Jean-sur-Richelieu Quebec	7.0
5	Barrie Ontario	6.9
6	Edmonton Alberta	6.8
7	Kelowna British Columbia	6.8
8	Vernon British Columbia	6.7
9	Saskatoon Saskatchewan	6.6
10	Newmarket Ontario	6.5
11	Airdrie Alberta	6.4
12	L'Ancienne-Lorette Quebec	6.4
13	Abbotsford British Columbia	6.3
14	Brossard Quebec	6.2
15	Cornwall Ontario	6.1
16	Greater Sudbury Ontario	6.1
17	Lethbridge Alberta	6.1
18	London Ontario	6.1
19	Montréal Quebec	6.1
20	Brantford Ontario	6.0
21	Toronto Ontario	6.0
22	Québec Quebec	6.0
23	Sept-Îles Quebec	5.8
24	Shawinigan Quebec	5.8
25	Central Saanich low-cost sensorsBritish Columbia	5.7
26	Sorel-Tracy Quebec	5.7
27	Trois-Rivières Quebec	5.7
28	Rivière-des-Prairies–Pointe-aux-Trembles Quebec	5.7
29	St. Catharines Ontario	5.6
30	Hamilton Ontario	5.5
31	Regina Saskatchewan	5.5
32	Delta British Columbia	5.4
33	Duncan British Columbia	5.4
34	Medicine Hat Alberta	5.4
35	Swift Current Saskatchewan	5.4
36	Kitchener Ontario	5.3
37	Langley British Columbia	5.3
38	Strawberry Hill British Columbia	5.3
39	St. Thomas Ontario	5.3
40	Windsor Ontario	5.3
41	Guelph Ontario	5.2
42	Milton Ontario	5.2
43	Oakville Ontario	5.2
44	Richmond British Columbia	5.2
45	Brampton Ontario	5.1
46	Drummondville Quebec	5.1
47	Vancouver British Columbia	5.1
48	Saint-Georges Quebec	5.1
49	Granby Quebec	5.0
50	Nepean low-cost sensorsOntario	5.0
51	Rouyn-Noranda Quebec	5.0
52	Waterdown Ontario	5.0
53	North Bay Ontario	4.9
54	Sarnia Ontario	4.9
55	Kamloops British Columbia	4.8
56	Langford British Columbia	4.8
57	Mississauga Ontario	4.8
58	Saguenay Quebec	4.8
59	Edmundston New Brunswick	4.8
60	Burnaby British Columbia	4.7
61	Coquitlam British Columbia	4.6
62	Belleville Ontario	4.5
63	Sherwood Park Alberta	4.5
64	Victoria British Columbia	4.5
65	Kingston Ontario	4.4
66	Port Coquitlam British Columbia	4.4
67	Squamish British Columbia	4.4
68	Cranbrook British Columbia	4.3
69	St. Albert Alberta	4.3
70	Campbell River British Columbia	4.2
71	Chatham Ontario	4.2
72	Ottawa Ontario	4.1
73	Sherbrooke Quebec	4.1
74	North Vancouver British Columbia	4.0
75	Alliston Ontario	3.8
76	Peterborough Ontario	3.8
77	Moncton New Brunswick	3.7
78	Nanaimo British Columbia	3.7
79	Prince George British Columbia	3.7
80	Miramichi New Brunswick	3.6
81	Sault Ste. Marie Ontario	3.5
82	Fredericton New Brunswick	3.4
83	Saint John New Brunswick	3.4
84	West Vancouver British Columbia	3.4
85	Charlottetown Prince Edward Island	3.3
86	Winnipeg low-cost sensorsManitoba	3.3
87	Terrace British Columbia	3.2
88	North Cowichan British Columbia	3.1
89	Dartmouth Nova Scotia	2.9
90	Gatineau low-cost sensorsQuebec	2.9
91	Port Alberni British Columbia	2.6
92	Fort McMurray Alberta	2.4
93	Grande Prairie Alberta	2.1
94	Whitehorse Yukon	2.1
95	Fort St. John British Columbia	2.0
96	Yellowknife low-cost sensorsNorthwest Territories	0.2

Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

Regions

Alberta 10 British Columbia 28 Manitoba 1 New Brunswick 5 Northwest Territories 1 Nova Scotia 2 Ontario 28 Prince Edward Island 1 Quebec 17 Saskatchewan 3 Yukon 1

Updated 2026-10-01 04:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.