Air quality in Ontario

Air quality index (AQI) and PM2.5 air pollution in Ontario

Last update at (local time)

LIVE AQI CITY RANKING

Real-time Ontario
Most polluted city ranking

#cityUS AQI
1 Cambridge

55

2 Woodstock

51

3 Brantford

50

4 Sault Ste Marie

48

5 Quinte West

45

6 Almonte

40

7 Bluewater

37

8 Grand Bend

37

9 London

37

10 Waterloo

37

(local time)

SEE WORLD AQI RANKING

AIR QUALITY DATA CONTRIBUTORS

137 Stations operated by

87 Contributors

https://cdn.airvisual.net/gov/tiny/airqualityontario.pnghttps://cdn.airvisual.net/assets/public-profiles/5f97d88383b2d01b93e7660f-avatar.pnghttps://cdn.airvisual.net/assets/public-profiles/60753b101ac44900078389f1-avatar.pnghttps://ui-avatars.com/api/?rounded=true&name=Township%20of%20Sioux%20Narrows%20-%20Nestor%20Fallshttps://cdn.airvisual.net/tiny/dd9110b7-b2b8-4eb2-a5d7-2c3865022741.jpghttps://cdn.airvisual.net/tiny/76a11892-e73b-49d3-aa3c-aecef0f3d31e.png

Join the movement!

Get a monitor and contributor to air quality data in your city.

BECOME A CONTRIBUTOR
Find out more about contributors and data sources

LIVE AQI CITY RANKING

Real-time Ontario
Cleanest city ranking

#cityUS AQI
1 Kirkland Lake

6

2 Mississauga

6

3 Richmond Hill

7

4 Ajax

9

5 Oshawa

9

6 Sudbury

10

7 Markham

11

8 Uxbridge

14

9 Innisfil

17

10 Timmins

17

(local time)

SEE WORLD AQI RANKING

#1 Air Quality App

Free iOS and Android air quality app

AirVisual App, Free iOS and Android air quality app
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
rectangle shape clicked to open the map in fullscreen
plus icon clicked to zoom the map in
minus icon clicked to zoom the map out

How to best protect from air pollution?

Reduce your air pollution exposure in Ontario

Which is the most polluted city in Ontario?

Cart
Your cart is empty

Connect With IQAir

Sign up for our newsletter