St. Catharines, Ontario, Canada Air Quality

Monitoring Station · St. Catharines, Canada
189
Unhealthy
Everyone should reduce prolonged outdoor exertion.
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Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
189 11pm
76
49
49 2am
49
49
56 5am
76
76
76 8am
56
49
47 11am
46
47
— 2pm
—
—
— 5pm
—
—
— 8pm
—
—
CAMS model adj +22
54
54
27
27
27
27
34
54
54
54
34
27
25
24
25

Air Quality Forecast (24h)

PM2.5129.1 µg/m³ ×8.6 WHO
Unhealthy
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Nearby Monitoring Stations

53
St. Catharines, Ontario, Canada
0.0 km PM2.5: 13.1 µg/m³

Nearby Cities

38 St. Catharines 38 Thorold 38 Niagara Falls 38 Niagara-on-the-Lake 38 Niagara Falls 38 Welland 18 Grand Island 35 Grimsby 30 Port Colborne

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-05-30T02:59 UTC.