Most polluted cities in Canada

96 measured cities ranked by PM2.5, this year. Worst: Kamloops at 13.8 µg/m³, #363 in the world.

#	City	µg/m³	× WHO
1	Kamloops British Columbia	13.8	2.8×
2	Vernon British Columbia	11.3	2.3×
3	Windsor Ontario	10.9	2.2×
4	Calgary Alberta	10.0	2.0×
5	Sarnia Ontario	9.8	2.0×
6	Edmonton Alberta	9.5	1.9×
7	London Ontario	9.5	1.9×
8	Brantford Ontario	9.4	1.9×
9	Nepean low-cost sensorsOntario	9.3	1.9×
10	Red Deer Alberta	9.2	1.8×
11	Cranbrook British Columbia	9.0	1.8×
12	St. Thomas Ontario	9.0	1.8×
13	Hamilton Ontario	8.9	1.8×
14	Milton Ontario	8.9	1.8×
15	Kitchener Ontario	8.7	1.7×
16	Toronto Ontario	8.6	1.7×
17	Guelph Ontario	8.5	1.7×
18	Chatham Ontario	8.4	1.7×
19	Newmarket Ontario	8.4	1.7×
20	L'Ancienne-Lorette Quebec	8.3	1.7×
21	Kelowna British Columbia	8.2	1.6×
22	Oakville Ontario	8.2	1.6×
23	Waterdown Ontario	8.2	1.6×
24	Sorel-Tracy Quebec	7.8	1.6×
25	Barrie Ontario	7.7	1.5×
26	Brampton Ontario	7.6	1.5×
27	Airdrie Alberta	7.5	1.5×
28	Mississauga Ontario	7.5	1.5×
29	St. Catharines Ontario	7.3	1.5×
30	Prince Albert Saskatchewan	7.2	1.4×
31	Sault Ste. Marie Ontario	7.2	1.4×
32	Shawinigan Quebec	7.2	1.4×
33	Alliston Ontario	7.1	1.4×
34	Lethbridge Alberta	7.1	1.4×
35	Yellowknife low-cost sensorsNorthwest Territories	7.1	1.4×
36	Fort McMurray Alberta	7.0	1.4×
37	Sherwood Park Alberta	7.0	1.4×
38	Brossard Quebec	6.9	1.4×
39	Medicine Hat Alberta	6.9	1.4×
40	Montréal Quebec	6.8	1.4×
41	Port Alberni British Columbia	6.8	1.4×
42	Regina Saskatchewan	6.8	1.4×
43	St. Albert Alberta	6.8	1.4×
44	Québec Quebec	6.8	1.4×
45	Chilliwack British Columbia	6.7	1.3×
46	Saskatoon Saskatchewan	6.7	1.3×
47	Swift Current Saskatchewan	6.6	1.3×
48	Belleville Ontario	6.5	1.3×
49	Cornwall Ontario	6.5	1.3×
50	Drummondville Quebec	6.5	1.3×
51	Granby Quebec	6.5	1.3×
52	Grande Prairie Alberta	6.5	1.3×
53	Trois-Rivières Quebec	6.5	1.3×
54	Kingston Ontario	6.4	1.3×
55	Prince George British Columbia	6.4	1.3×
56	Rivière-des-Prairies–Pointe-aux-Trembles Quebec	6.4	1.3×
57	Winnipeg low-cost sensorsManitoba	6.2	1.2×
58	Edmundston New Brunswick	6.2	1.2×
59	Ottawa Ontario	6.1	1.2×
60	Gatineau low-cost sensorsQuebec	6.0	1.2×
61	Peterborough Ontario	5.9	1.2×
62	Abbotsford British Columbia	5.8	1.2×
63	Greater Sudbury Ontario	5.8	1.2×
64	Squamish British Columbia	5.8	1.2×
65	Fort St. John British Columbia	5.7	1.1×
66	Sherbrooke Quebec	5.7	1.1×
67	North Bay Ontario	5.6	1.1×
68	Saguenay Quebec	5.6	1.1×
69	Harewood British Columbia	5.6	1.1×
70	Saint-Jean-sur-Richelieu Quebec	5.4	1.1×
71	Victoria British Columbia	5.4	1.1×
72	Sept-Îles Quebec	5.2	1.0×
73	Vancouver British Columbia	5.2	1.0×
74	Burnaby British Columbia	5.1	1.0×
75	Coquitlam British Columbia	5.1	1.0×
76	Duncan British Columbia	5.1	1.0×
77	Langley British Columbia	5.1	1.0×
78	Strawberry Hill British Columbia	5.0	1.0×
79	Port Coquitlam British Columbia	4.9	1.0×
80	Richmond British Columbia	4.8	1.0×
81	Rouyn-Noranda Quebec	4.8	1.0×
82	Saint John New Brunswick	4.8	1.0×
83	Nanaimo British Columbia	4.7	0.9×
84	Terrace British Columbia	4.5	0.9×
85	Fredericton New Brunswick	4.4	0.9×
86	Moncton New Brunswick	4.3	0.9×
87	North Vancouver British Columbia	4.3	0.9×
88	Delta British Columbia	4.2	0.8×
89	Miramichi New Brunswick	4.2	0.8×
90	Whitehorse Yukon	4.2	0.8×
91	West Vancouver British Columbia	4.2	0.8×
92	Sydney Nova Scotia	4.0	0.8×
93	Charlottetown Prince Edward Island	3.6	0.7×
94	Campbell River British Columbia	3.4	0.7×
95	Dartmouth Nova Scotia	3.4	0.7×
96	North Cowichan British Columbia	3.3	0.7×

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

Estimated: cities without a monitor

Canada cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City	7-day estimate	Band
Surrey estimated	≈ 6 µg/m³	Good
Halifax estimated	≈ 4 µg/m³	Good
Laval estimated	≈ 7 µg/m³	Good
Etobicoke estimated	≈ 6 µg/m³	Good
Markham estimated	≈ 4 µg/m³	Good
Vaughan estimated	≈ 5 µg/m³	Good
Longueuil estimated	≈ 7 µg/m³	Good
Richmond Hill estimated	≈ 5 µg/m³	Good
Burlington estimated	≈ 5 µg/m³	Good
Oshawa estimated	≈ 5 µg/m³	Good
Gloucester estimated	≈ 5 µg/m³	Good
Rosemont–La Petite-Patrie estimated	≈ 7 µg/m³	Good
Villeray–Saint-Michel–Parc-Extension estimated	≈ 7 µg/m³	Good
Lévis estimated	≈ 8 µg/m³	Good
Mercier–Hochelaga-Maisonneuve estimated	≈ 7 µg/m³	Good
Whitby estimated	≈ 5 µg/m³	Good
Cambridge estimated	≈ 5 µg/m³	Good
Orléans estimated	≈ 4 µg/m³	Good
Ottawa South estimated	≈ 5 µg/m³	Good
Saint-Louis-de-Terrebonne estimated	≈ 7 µg/m³	Good
Ajax estimated	≈ 5 µg/m³	Good
Saanich estimated	≈ 4 µg/m³	Good
Thornhill estimated	≈ 5 µg/m³	Good
Terrebonne estimated	≈ 7 µg/m³	Good
St. John's estimated	≈ 6 µg/m³	Good
Thunder Bay estimated	≈ 5 µg/m³	Good
Le Plateau-Mont-Royal estimated	≈ 7 µg/m³	Good
Waterloo estimated	≈ 4 µg/m³	Good
Ville-Marie estimated	≈ 7 µg/m³	Good
Niagara Falls estimated	≈ 6 µg/m³	Good
Pickering estimated	≈ 5 µg/m³	Good
Kanata estimated	≈ 4 µg/m³	Good
Montréal-Nord estimated	≈ 7 µg/m³	Good
Le Sud-Ouest estimated	≈ 7 µg/m³	Good
Repentigny estimated	≈ 7 µg/m³	Good
Maple Ridge estimated	≈ 6 µg/m³	Good
Willowdale estimated	≈ 5 µg/m³	Good
New Westminster estimated	≈ 6 µg/m³	Good
Caledon estimated	≈ 4 µg/m³	Good
Stoney Creek estimated	≈ 5 µg/m³	Good

Regions

Alberta 10 British Columbia 27 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 08:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.