Air Quality in St. Catharines, Canada

Windy
8.9°C · 63.0% humidity
8.9°
Feels 3.7°
24
Good
Air quality is satisfactory. Enjoy outdoor activities.
4 stations

Nearby Monitoring Stations

AQI Forecast
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Station readings
23
23
25
26
25

Air Quality Index Trend

47h · 1 stn

St. Catharines's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

63.0%
Humidity
54.9 km/h
Wind ENE
1028.7 hPa
Pressure
0.0
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5
24
5.82 µg/m³
PM10▲
38
41.2 µg/m³
050100150200300500

What is the weather forecast for St. Catharines?

Temperature & Precipitation

PM2.5 Trend

47h · 1 station
PM2.55.82 µg/m³ ✓ WHO
Good
PM1041.2 µg/m³
Good
UV INDEX0.0
Low
Station readings (4 stations within 25 km)
5.82
Median
5.83
Average
5.5
Low
6.0
High
PM2.5 µg/m³ · Model: 13.5 · Bias: +7.7

What is the 7-day forecast for St. Catharines?

10-20
9.6° 7.8°
0.88 mm
10-21
16.4° 8.9°
10-22
16.1° 9.6°
10-23
14.7° 7.8°
2.87 mm
10-24
18.1° 9.0°
10-25
14.4° 7.5°
4.56 mm
10-26
11.2° 9.6°
3.31 mm
Both models agree Avg diff: 4.0°C

Where are air quality stations near St. Catharines?

34
St. Catharines, Ontario, Canada
1.4 km PM2.5: 8.2 µg/m³
23
St. Catharines, Ontario, Canada
1.4 km PM2.5: 5.5 µg/m³
26
St. Catharines, Ontario, Canada
1.4 km PM2.5: 6.2 µg/m³
25
St. Catharines, Ontario, Canada
1.4 km PM2.5: 6.0 µg/m³
22
St. Catharines, Ontario, Canada
1.4 km PM2.5: 5.3 µg/m³
23
St. Catharines, Ontario, Canada
1.4 km PM2.5: 5.5 µg/m³
25
St. Catharines, Ontario, Canada
1.4 km PM2.5: 6.0 µg/m³

What cities are near St. Catharines?

24 Thorold 24 Niagara-on-the-Lake 24 Niagara Falls 24 Niagara Falls 24 Welland 23 Grimsby 13 Grand Island 13 Port Colborne 12 North Tonawanda 13 Kenmore
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-20T21:47 UTC.