Ontario Air Quality Index (AQI) | Air Pollution
Real-time PM2.5, PM10 air pollution level in Ontario
Check the air quality level of thecities in Ontario
Ontario
Ontario's Cities
Real-time Air Pollution Level
Canada's Metro Cities
Air Quality Index
Most Polluted Cities 2026
Canada
Analyze the real-time most air polluted cities in the country.
Standard Value
1.
Waterloo, Ontario
Hazardous
17xabove Standard
2.
London, Ontario
Hazardous
17xabove Standard
3.
Guelph, Ontario
Severe
17xabove Standard
4.
Brantford, Ontario
Severe
16xabove Standard
5.
Newmarket, Ontario
Severe
10xabove Standard
6.
Toronto, Ontario
Unhealthy
7xabove Standard
7.
Brampton, Ontario
Unhealthy
5xabove Standard
8.
Parry Sound, Ontario
Poor
3xabove Standard
9.
St Catharines, Ontario
Moderate
2xabove Standard
10.
Mississauga, Ontario
Moderate
2xabove Standard
Last Updated: 17 Jul 2026, 06:31 AM
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