St. Catharines, Ontario, Canada Air Quality

Monitoring Station · St. Catharines, Canada
53
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Last Reading

Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
15 11pm
52
25
53 2am
25
25
32 5am
52
52
52 8am
32
25
23 11am
22
23
— 2pm
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—
— 5pm
—
—
— 8pm
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Station readings
15
53
CAMS model adj -2
54
54
27
27
27
27
34
54
54
54
34
27
25
24
25

Air Quality Forecast (24h)

PM2.513.1 µg/m³ ✓ WHO
Moderate
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Nearby Monitoring Stations

189
St. Catharines, Ontario, Canada
0.0 km PM2.5: 129.1 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.