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 Ottawa

36

2 Dorset

33

3 Mississauga

33

4 Oshawa

33

5 Parry Sound

33

6 Sault Ste Marie

33

7 Kingston

31

8 Milton

31

9 Brampton

30

10 Port Stanley

30

(local time)

SEE WORLD AQI RANKING

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LIVE AQI CITY RANKING

Real-time Ontario
Cleanest city ranking

#cityUS AQI
1 Kirkland Lake

2

2 Coldwater

4

3 Owen Sound

4

4 Tiverton

6

5 Sudbury

7

6 Brockville

8

7 Orillia

8

8 Richmond Hill

8

9 Waterloo

9

10 Ajax

12

(local time)

SEE WORLD AQI RANKING

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Hazardous
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