St. Catharines, Ontario, Canada Air Quality

Monitoring Station · St. Catharines, Canada
61
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
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Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
46 5pm
66
66
66 8pm
66
66
46 11pm
46
37
37 2am
37
37
39 5am
39
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— 8am
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— 11am
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CAMS model adj +12
34
54
54
54
54
54
34
34
25
25
25
25
27
27

Air Quality Forecast (24h)

PM2.516.9 µg/m³ ×1.1 WHO
Moderate
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Nearby Monitoring Stations

43
St. Catharines, Ontario, Canada
0.0 km PM2.5: 10.3 µg/m³

Nearby Cities

35 St. Catharines 35 Thorold 35 Niagara Falls 35 Niagara-on-the-Lake 35 Niagara Falls 35 Welland 96 Grand Island 35 Grimsby 64 Port Colborne

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-07-21T20:10 UTC.