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 Niagara Falls

68

2 Mississauga

63

3 Quinte West

61

4 Brampton

60

5 Milton

58

6 Ajax

55

7 Markham

45

8 Niagara on the Lake

44

9 Burlington

43

10 Hamilton

41

(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 North Bay

7

3 Sault Ste Marie

7

4 Renfrew

8

5 Waterloo

8

6 Timmins

12

7 Tiverton

12

8 Almonte

16

9 Owen Sound

16

10 Grand Bend

17

(local time)

SEE WORLD AQI RANKING

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Hazardous
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