WorldArrow icon
Arrow iconOntario

Air quality in Ontario

Air quality index (AQI⁺) and PM2.5 air pollution in Ontario • 21:27, Nov 13

Government of Ontario, Ministry of the EnvironmentOklahoma Department of Environmental Quality AnonymousJim GuilletNational Air Pollution Surveillance ProgramPiéEVCOChris Fournier**@airqualitybrampton & airqualitybrampton@gmail.comMark OberemkGraydonSouth RichvaleHamilton Air Monitoring Network - HAMNMC2025Stacey SchacterstevepaulquinnMeBelltown - Oakley AveAmy CuriousKevin DamenNichols FamilyAnonymousElectric Vehicle Council of OttawaCSA HamiltonianMikoAirJayDeeVBbsummAnonymous DGEC - GreensvilleSlyyyMinistry of the Environment and the Fight against Climate ChangeSteven RichieAnonymousrandalljhowardARTJackBBriarwood Ave. Matt WojtowiczDataforge CanadaSWBradley SangerBijanMichiruWildflower Bee Farm Ontario and Nova ScotiaC McKTimothy DresserBBT Batteries Ltd.Captain Benjamin WillardEric SteinLara TAnonymousHaig BlvdDave McKeeCanadian Air and Precipitation Monitoring NetworkJpSKatwyks on the RiverPierreMeS WepplerMitch LPeter CornelisseAnonymousGregMattKaren-Ann XavierAnonymous contributor
1 stations sponsored by The Foundation for Clean Air
Government of Ontario, Ministry of the EnvironmentOklahoma Department of Environmental Quality AnonymousJim GuilletNational Air Pollution Surveillance ProgramPiéEVCOChris Fournier**@airqualitybrampton & airqualitybrampton@gmail.comMark OberemkGraydonSouth RichvaleHamilton Air Monitoring Network - HAMNMC2025Stacey SchacterstevepaulquinnMeBelltown - Oakley AveAmy CuriousKevin DamenNichols FamilyAnonymousElectric Vehicle Council of OttawaCSA HamiltonianMikoAirJayDeeVBbsummAnonymous DGEC - GreensvilleSlyyyMinistry of the Environment and the Fight against Climate ChangeSteven RichieAnonymousrandalljhowardARTJackBBriarwood Ave. Matt WojtowiczDataforge CanadaSWBradley SangerBijanMichiruWildflower Bee Farm Ontario and Nova ScotiaC McKTimothy DresserBBT Batteries Ltd.Captain Benjamin WillardEric SteinLara TAnonymousHaig BlvdDave McKeeCanadian Air and Precipitation Monitoring NetworkJpSKatwyks on the RiverPierreMeS WepplerMitch LPeter CornelisseAnonymousGregMattKaren-Ann XavierAnonymous 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

Timmins

39

2
The national flag of Canada

Brantford

32

3
The national flag of Canada

Kenora

32

4
The national flag of Canada

Grand Bend

28

5
The national flag of Canada

East Garafraxa

27

6
The national flag of Canada

Newmarket

27

7
The national flag of Canada

Sarnia

27

8
The national flag of Canada

St. Catharines

27

9
The national flag of Canada

Peterborough

26

10
The national flag of Canada

Wellington County

26

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

Bruce Mines

0

3
The national flag of Canada

Caledon

0

4
The national flag of Canada

Etobicoke

0

5
The national flag of Canada

Niagara on the Lake

0

6
The national flag of Canada

Perth

0

7
The national flag of Canada

Pickering

0

8
The national flag of Canada

Richmond Hill

0

9
The national flag of Canada

Vaughan

0

10
The national flag of Canada

Willowdale

0

Wildfires in Ontario

Real-time information

Active fires

--

A foggy, hazy view of India Gate in New Delhi. Several cyclists in bright yellow high-visibility jackets ride along the wide road leading toward the monument, with the arch barely visible through the thick smog.
external link icon

India Air Quality Alert

external link icon

Can air purifiers help prevent blood sugar spikes?

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.
external link icon

China Air Quality Alert

Which is the most polluted city in Ontario?