Air quality by country

Air quality in Canada today

Updated Sun, 25 Oct 2026 19:43:35 GMT

Good: average US AQI 43 across 78 cities Worst now: Windsor (78); cleanest: Red Deer (24).

Live US AQI, PM2.5 and ozone for cities across Canada, ranked from most polluted to cleanest.

Average US AQI: 43 Good
Most polluted now: Windsor AQI 78
Cleanest now: Red Deer AQI 24
Cities above 100: 0 unhealthy for sensitive groups or worse

Air quality in Canada today

Right now the modelled air quality in Canada averages a US AQI of 43 (Good) across the 78 cities we track. By category: 47 Good, 31 Moderate (of 78).

That is 22 points better than the worldwide average of 65 across 3,909 cities.

Windsor has the worst air at 78 with PM2.5 at 14 µg/m³, while Red Deer is cleanest at 24. No tracked city is above 100, the level where sensitive groups are advised to cut back outdoors.

Canada cities by AQI (most polluted first)

City	Region	US AQI	Category	PM2.5 µg/m³	Ozone µg/m³
Windsor	Ontario	78	Moderate	13.6	95
Vernon	British Columbia	71	Moderate	7.1	79
Montréal	Quebec	60	Moderate	4	63
Laval	Quebec	60	Moderate	4	63
Longueuil	Quebec	60	Moderate	4	63
Rosemont–La Petite-Patrie	Quebec	60	Moderate	4	63
Villeray–Saint-Michel–Parc-Extension	Quebec	60	Moderate	4	63
Mercier–Hochelaga-Maisonneuve	Quebec	60	Moderate	4	63
Le Plateau-Mont-Royal	Quebec	60	Moderate	4	63
Ville-Marie	Quebec	60	Moderate	4	63
Kamloops	British Columbia	57	Moderate	4.3	77
Aurora, ON	Ontario	57	Moderate	5.8	81
Ottawa	Ontario	56	Moderate	3.9	68
Mississauga	Ontario	56	Moderate	6.7	90
Brampton	Ontario	56	Moderate	6.7	90
Gatineau	Quebec	56	Moderate	3.9	68
Oakville	Ontario	56	Moderate	6.7	90
Burlington	Ontario	56	Moderate	6.7	90
Orléans	Ontario	56	Moderate	3.9	68
Ottawa South	Ontario	56	Moderate	3.9	68
Georgetown, ON	Ontario	56	Moderate	5.3	92
Prince George	British Columbia	55	Moderate	16.6	79
Québec	Quebec	54	Moderate	5.2	57
Barrie	Ontario	54	Moderate	5.7	75
Lévis	Quebec	54	Moderate	5.2	57
Sarnia	Ontario	53	Moderate	9.6	95
Wasaga Beach	Ontario	52	Moderate	5.5	82
Kitchener	Ontario	51	Moderate	6.5	96
Nepean	Ontario	51	Moderate	3.5	79
Gloucester	Ontario	51	Moderate	3.5	79
Waterloo	Ontario	51	Moderate	6.5	96
Cranbrook	British Columbia	50	Good	3.7	68
Markham	Ontario	49	Good	7.2	76
Kingston, ON	Ontario	47	Good	4.2	86
Cambridge, ON	Ontario	47	Good	5.2	97
Brantford	Ontario	47	Good	5.2	97
Hamilton	Ontario	45	Good	5.4	97
Calgary	Alberta	40	Good	2.7	64
Whitby	Ontario	38	Good	8.3	76
Toronto	Ontario	37	Good	7.9	86
Etobicoke	Ontario	37	Good	7.9	86
Vaughan	Ontario	37	Good	7.9	86
Richmond Hill	Ontario	37	Good	7.9	86
Thornhill	Ontario	37	Good	7.9	86
Niagara Falls	Ontario	36	Good	3.7	106
London, ON	Ontario	35	Good	6.2	98
Peterborough, ON	Ontario	35	Good	5.1	77
St. Thomas	Ontario	35	Good	6.2	98
Fort McMurray	Alberta	34	Good	0.8	75
Grimsby, ON	Ontario	34	Good	5.7	98
Whitehorse	Yukon	33	Good	1.4	76
Edmonton	Alberta	32	Good	3.8	71
Regina	Saskatchewan	32	Good	1.7	79
Kelowna	British Columbia	32	Good	3.7	75
Brandon, MB	Manitoba	32	Good	0.9	75
Yellowknife	Northwest Territories	32	Good	2.1	73
Winnipeg	Manitoba	31	Good	0.5	75
Vancouver	British Columbia	31	Good	3.4	68
Surrey	British Columbia	31	Good	3.5	58
Halifax	Nova Scotia	31	Good	2.4	77
Victoria, BC	British Columbia	31	Good	4.7	58
Burnaby	British Columbia	31	Good	3.4	68
Richmond, BC	British Columbia	31	Good	3.4	68
Langley	British Columbia	31	Good	3.5	58
Saanich	British Columbia	31	Good	4.7	58
Thunder Bay	Ontario	31	Good	1.5	76
Delta	British Columbia	31	Good	3.4	68
Dartmouth	Nova Scotia	31	Good	2.4	77
Bedford, NS	Nova Scotia	31	Good	2.4	77
North Bay	Ontario	30	Good	7.3	81
Sydney, NS	Nova Scotia	29	Good	1.6	69
Cornwall	Ontario	29	Good	2.8	78
Dieppe, NB	New Brunswick	27	Good	2.7	72
Mission, BC	British Columbia	26	Good	2.1	58
Lethbridge	Alberta	25	Good	2.3	59
Sherwood Park	Alberta	25	Good	3.1	74
Grande Prairie	Alberta	25	Good	3.2	68
Red Deer	Alberta	24	Good	3.2	68

Air quality by province

Region	Cities	Average US AQI	Category
Quebec	11	59	Moderate
Ontario	36	46	Good
British Columbia	14	39	Good
Yukon	1	33	Good
Manitoba	2	32	Good
Saskatchewan	1	32	Good
Northwest Territories	1	32	Good
Nova Scotia	4	31	Good
Alberta	7	29	Good
New Brunswick	1	27	Good

Smoky towns right now in Canada

4 smaller towns have a US AQI of 100 or more now or forecast within 24 hours, often from wildfire smoke.

Town	Region	US AQI now	Peak next 24 h	PM2.5 µg/m³
Smithers	British Columbia	93	155	8.8
Nelson, BC	British Columbia	120	130	23.7
Castlegar	British Columbia	95	119	15.8
Trail	British Columbia	95	119	15.8

What the US AQI numbers mean

US AQI	Category	What it means
0-50	Good	Air quality is satisfactory and poses little or no risk; a good time for outdoor activity.
51-100	Moderate	Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
101-150	Unhealthy for Sensitive Groups	People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors.
151-200	Unhealthy	Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed.
201-300	Very Unhealthy	Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors.
301-500	Hazardous	Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500.

Modelled by CAMS (Copernicus) via Open-Meteo, refreshed twice a day; read hour by hour from the forecast.

By state / province

Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).

Air quality in Canada today

Air quality in Canada today

Canada cities by AQI (most polluted first)

Air quality by province

Smoky towns right now in Canada

What the US AQI numbers mean

By state / province

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