St. Catharines, Ontario, Canada

Monitoring Station · St. Catharines, Canada
55
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
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Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast
99 4am
99
55
99 7am
99
99
99 10am
136
136
50 1pm
50
37
37 4pm
37
50
— 7pm
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—
— 10pm
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— 1am
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Air Quality Trend (24h)

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Nearby Monitoring Stations

57
St. Catharines, Ontario, Canada
0.0 km

Nearby Cities

56 St. Catharines 56 Thorold 56 Niagara Falls 56 Niagara-on-the-Lake 56 Niagara Falls 31 Welland 37 Grand Island 56 Grimsby 31 Port Colborne

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-04-12T07:44 UTC.