SmogRank / Cleaner or dirtier / Canada

Canada: cleaner or dirtier, 2025

In Canada, 113 cities have enough days in both years to compare 2025 with the same days of 2024: 85 got dirtier and 22 cleaner.

The 85 cities that got dirtier, biggest rise first

#	City	2024	2025	Change
1	Williams LakeBritish Columbia, Canada	17	37	+3.6 µg/m³+120%
2	Prince AlbertSaskatchewan, Canada	55	60	+2.9 µg/m³+26%
3	EstevanSaskatchewan, Canada	52	58	+2.7 µg/m³+27%
4	WindsorOntario, Canada	47	54	+2.1 µg/m³+25%
5	Sault Ste. MarieOntario, Canada	27	37	+1.9 µg/m³+40%
6	Parry SoundOntario, Canada	27	38	+1.9 µg/m³+39%
7	TorontoOntario, Canada	39	49	+1.7 µg/m³+24%
8	NewmarketOntario, Canada	35	44	+1.7 µg/m³+27%
9	Rouyn-NorandaQuebec, Canada	25	34	+1.7 µg/m³+38%
10	Sorel-TracyQuebec, Canada	44	52	+1.7 µg/m³+22%
11	SarniaOntario, Canada	37	44	+1.4 µg/m³+21%
12	BellevilleOntario, Canada	29	37	+1.4 µg/m³+27%
13	NepeanOntario, Canada	54	57	+1.4 µg/m³+13%
14	North BayOntario, Canada	26	33	+1.3 µg/m³+28%
15	Port AlberniBritish Columbia, Canada	32	39	+1.3 µg/m³+22%
16	MiltonOntario, Canada	39	46	+1.2 µg/m³+17%
17	LondonOntario, Canada	40	47	+1.2 µg/m³+17%
18	BramptonOntario, Canada	35	42	+1.2 µg/m³+19%
19	Trois-RivièresQuebec, Canada	34	41	+1.2 µg/m³+20%
20	BarrieOntario, Canada	39	46	+1.2 µg/m³+17%
21	Greater SudburyOntario, Canada	29	36	+1.1 µg/m³+21%
22	NanaimoBritish Columbia, Canada	19	25	+1.1 µg/m³+32%
23	SaskatoonSaskatchewan, Canada	54	56	+1.1 µg/m³+10%
24	GranbyQuebec, Canada	34	41	+1.1 µg/m³+18%
25	KingstonOntario, Canada	29	35	+1.1 µg/m³+21%
26	KelownaBritish Columbia, Canada	28	34	+1.1 µg/m³+22%
27	LethbridgeAlberta, Canada	36	41	+1.0 µg/m³+16%
28	QuébecQuebec, Canada	36	41	+1.0 µg/m³+16%
29	MississaugaOntario, Canada	34	39	+1.0 µg/m³+16%
30	SquamishBritish Columbia, Canada	27	33	+1.0 µg/m³+20%
31	KitchenerOntario, Canada	39	44	+0.9 µg/m³+13%
32	OakvilleOntario, Canada	38	43	+0.9 µg/m³+13%
33	DorvalQuebec, Canada	36	41	+0.9 µg/m³+14%
34	OttawaOntario, Canada	33	38	+0.9 µg/m³+15%
35	Swift CurrentSaskatchewan, Canada	43	48	+0.9 µg/m³+12%
36	PeterboroughOntario, Canada	32	37	+0.9 µg/m³+16%
37	WaterdownOntario, Canada	37	41	+0.8 µg/m³+12%
38	GibsonsBritish Columbia, Canada	26	30	+0.8 µg/m³+17%
39	GuelphOntario, Canada	36	41	+0.8 µg/m³+12%
40	VancouverBritish Columbia, Canada	25	29	+0.8 µg/m³+18%
41	AgassizBritish Columbia, Canada	24	29	+0.8 µg/m³+18%
42	ReginaSaskatchewan, Canada	52	54	+0.8 µg/m³+8%
43	BrantfordOntario, Canada	41	46	+0.8 µg/m³+11%
44	L'Ancienne-LoretteQuebec, Canada	41	44	+0.7 µg/m³+10%
45	St. CatharinesOntario, Canada	35	39	+0.7 µg/m³+11%
46	VictoriaBritish Columbia, Canada	27	31	+0.7 µg/m³+15%
47	Campbell RiverBritish Columbia, Canada	17	21	+0.7 µg/m³+23%
48	QuesnelBritish Columbia, Canada	47	51	+0.7 µg/m³+8%
49	HopeBritish Columbia, Canada	24	28	+0.7 µg/m³+16%
50	MontréalQuebec, Canada	39	43	+0.6 µg/m³+8%
51	ShawiniganQuebec, Canada	37	40	+0.6 µg/m³+9%
52	BrossardQuebec, Canada	35	38	+0.6 µg/m³+10%
53	DrummondvilleQuebec, Canada	35	38	+0.6 µg/m³+10%
54	ChathamOntario, Canada	35	38	+0.6 µg/m³+10%
55	DeltaBritish Columbia, Canada	20	23	+0.6 µg/m³+17%
56	HamiltonOntario, Canada	42	45	+0.6 µg/m³+8%
57	St. ThomasOntario, Canada	37	41	+0.6 µg/m³+9%
58	WhistlerBritish Columbia, Canada	26	29	+0.6 µg/m³+13%
59	CoquitlamBritish Columbia, Canada	23	27	+0.6 µg/m³+14%
60	VernonBritish Columbia, Canada	38	41	+0.5 µg/m³+7%
61	Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada	37	40	+0.5 µg/m³+7%
62	KamloopsBritish Columbia, Canada	36	38	+0.5 µg/m³+8%
63	ChilliwackBritish Columbia, Canada	27	29	+0.5 µg/m³+10%
64	RichmondBritish Columbia, Canada	24	27	+0.5 µg/m³+11%
65	North CowichanBritish Columbia, Canada	19	22	+0.5 µg/m³+14%
66	KitimatBritish Columbia, Canada	19	22	+0.5 µg/m³+15%
67	CastlegarBritish Columbia, Canada	39	42	+0.4 µg/m³+6%
68	BurnabyBritish Columbia, Canada	25	27	+0.4 µg/m³+9%
69	Port CoquitlamBritish Columbia, Canada	24	26	+0.4 µg/m³+9%
70	AbbotsfordBritish Columbia, Canada	26	28	+0.4 µg/m³+9%
71	St. AlbertAlberta, Canada	51	52	+0.3 µg/m³+3%
72	West VancouverBritish Columbia, Canada	22	23	+0.3 µg/m³+8%
73	SherbrookeQuebec, Canada	33	34	+0.3 µg/m³+5%
74	Saint-Jean-sur-RichelieuQuebec, Canada	29	31	+0.3 µg/m³+6%
75	LangleyBritish Columbia, Canada	25	27	+0.3 µg/m³+7%
76	Strawberry HillBritish Columbia, Canada	25	27	+0.3 µg/m³+7%
77	KentvilleNova Scotia, Canada	21	23	+0.3 µg/m³+8%
78	CranbrookBritish Columbia, Canada	41	42	+0.2 µg/m³+3%
79	Medicine HatAlberta, Canada	40	41	+0.2 µg/m³+3%
80	EdmundstonNew Brunswick, Canada	34	35	+0.2 µg/m³+3%
81	Saint JohnNew Brunswick, Canada	25	26	+0.2 µg/m³+4%
82	Saint John EastNew Brunswick, Canada	25	26	+0.2 µg/m³+4%
83	MonctonNew Brunswick, Canada	24	26	+0.2 µg/m³+5%
84	North VancouverBritish Columbia, Canada	22	22	+0.1 µg/m³+3%
85	FrederictonNew Brunswick, Canada	24	25	+0.1 µg/m³+2%

The 22 cities that got cleaner, biggest fall first

#	City	2024	2025	Change
1	Fort SaskatchewanAlberta, Canada	57	53	−2.2 µg/m³−18%
2	Grande PrairieAlberta, Canada	56	52	−1.9 µg/m³−16%
3	Drayton ValleyAlberta, Canada	52	46	−1.2 µg/m³−13%
4	AirdrieAlberta, Canada	39	33	−1.1 µg/m³−15%
5	Fort McMurrayAlberta, Canada	60	58	−1.1 µg/m³−8%
6	SaguenayQuebec, Canada	41	37	−0.8 µg/m³−11%
7	SmithersBritish Columbia, Canada	38	33	−0.8 µg/m³−12%
8	HarewoodBritish Columbia, Canada	31	27	−0.7 µg/m³−13%
9	Fort St. JohnBritish Columbia, Canada	42	38	−0.6 µg/m³−8%
10	Red DeerAlberta, Canada	52	49	−0.6 µg/m³−6%
11	Grand CentreAlberta, Canada	54	53	−0.6 µg/m³−6%
12	Sherwood ParkAlberta, Canada	51	49	−0.4 µg/m³−4%
13	CharlottetownPrince Edward Island, Canada	24	22	−0.4 µg/m³−9%
14	EdmontonAlberta, Canada	58	57	−0.4 µg/m³−3%
15	TerraceBritish Columbia, Canada	29	27	−0.3 µg/m³−6%
16	EdsonAlberta, Canada	43	41	−0.3 µg/m³−4%
17	CalgaryAlberta, Canada	53	53	−0.2 µg/m³−2%
18	Labrador CityNewfoundland and Labrador, Canada	25	24	−0.2 µg/m³−4%
19	MissionBritish Columbia, Canada	32	31	−0.2 µg/m³−4%
20	BécancourQuebec, Canada	43	42	−0.2 µg/m³−3%
21	MiramichiNew Brunswick, Canada	24	24	−0.1 µg/m³−2%
22	DuncanBritish Columbia, Canada	33	32	−0.1 µg/m³−2%

Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.