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Air quality in Ontario

Air quality index (AQI⁺) and PM2.5 air pollution in Ontario • 01:16, Nov 12

Government of Ontario, Ministry of the EnvironmentOklahoma Department of Environmental Quality AnonymousJim GuilletPiéEVCOChris Fournier**@airqualitybrampton & airqualitybrampton@gmail.comMark OberemkGraydonSouth RichvaleHamilton Air Monitoring Network - HAMNMC2025Stacey SchacterstevepaulquinnBelltown - Oakley AveMeAmy CuriousKevin DamenNichols FamilyAnonymousElectric Vehicle Council of OttawaCSA HamiltonianMikoAirJayDeeVBbsummAnonymous DGEC - GreensvilleSlyyyMinistry of the Environment and the Fight against Climate ChangePaulSteven RichieAnonymousrandalljhowardARTSean StewartJackBBriarwood Ave. Matt WojtowiczDataforge CanadaSWBradley SangerBijanMichiruWildflower Bee Farm Ontario and Nova ScotiaTimothy DresserBBT Batteries Ltd.Captain Benjamin WillardEric SteinLara TAnonymousHaig BlvdDave McKeeCanadian Air and Precipitation Monitoring NetworkKatwyks on the RiverPierreJpSMeS WepplerMitch LPeter CornelisseGregMattAnonymous contributor
1 stations sponsored by The Foundation for Clean Air
Government of Ontario, Ministry of the EnvironmentOklahoma Department of Environmental Quality AnonymousJim GuilletPiéEVCOChris Fournier**@airqualitybrampton & airqualitybrampton@gmail.comMark OberemkGraydonSouth RichvaleHamilton Air Monitoring Network - HAMNMC2025Stacey SchacterstevepaulquinnBelltown - Oakley AveMeAmy CuriousKevin DamenNichols FamilyAnonymousElectric Vehicle Council of OttawaCSA HamiltonianMikoAirJayDeeVBbsummAnonymous DGEC - GreensvilleSlyyyMinistry of the Environment and the Fight against Climate ChangePaulSteven RichieAnonymousrandalljhowardARTSean StewartJackBBriarwood Ave. Matt WojtowiczDataforge CanadaSWBradley SangerBijanMichiruWildflower Bee Farm Ontario and Nova ScotiaTimothy DresserBBT Batteries Ltd.Captain Benjamin WillardEric SteinLara TAnonymousHaig BlvdDave McKeeCanadian Air and Precipitation Monitoring NetworkKatwyks on the RiverPierreJpSMeS WepplerMitch LPeter CornelisseGregMattAnonymous contributor
1 stations sponsored by The Foundation for Clean Air

Live most polluted city ranking

Real-time Ontario most polluted city ranking

#CitiesAQI⁺ US
1
The national flag of Canada

Oakville

59

2
The national flag of Canada

Woodstock

58

3
The national flag of Canada

Dorchester

54

4
The national flag of Canada

Pembroke

52

5
The national flag of Canada

Grand Bend

50

6
The national flag of Canada

East York

44

7
The national flag of Canada

Brantford

43

8
The national flag of Canada

Orangeville

36

9
The national flag of Canada

London

34

10
The national flag of Canada

Milton

33

Live cleanest city ranking

Real-time Ontario cleanest city ranking

#CitiesAQI⁺ US
1
The national flag of Canada

Algoma

0

2
The national flag of Canada

Kasabonika

0

3
The national flag of Canada

Larder Lake

0

4
The national flag of Canada

Tobermory

0

5
The national flag of Canada

Bells Corners

1

6
The national flag of Canada

Quinte West

1

7
The national flag of Canada

South Huron

1

8
The national flag of Canada

Ajax

2

9
The national flag of Canada

Greenstone

2

10
The national flag of Canada

Red Lake

2

Wildfires in Ontario

Real-time information

Active fires

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Forest fire
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Aerial view of a traditional temple complex surrounded by dense greenery. Several buildings with red and orange tiled roofs are partially obscured by thick haze, reducing visibility across the landscape.
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China Air Quality Alert

Cities and industrial smoke clouds the sky
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COP31: Why air quality is key to climate health

Which is the most polluted city in Ontario?