Air Quality in St. Catharines, Canada
Drizzle
18.1°C · 81.5% humidity
18.1°
Feels 18.1°
12
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations
Nearby Monitoring Stations
St. Catharines's air quality — share it
AQI Forecast
Calibrated
16
5am
16
16
12
8am
16
17
17
11am
17
17
17
2pm
17
17
17
5pm
17
17
17
8pm
26
26
26
11pm
46
46
46
2am
46
46
Station readings
21
21
2
CAMS model
adj -8
24
24
24
24
24
25
25
25
25
25
25
25
25
25
25
25
34
34
34
54
54
54
54
54
Air Quality Index Trend
46h · 1 stnSt. 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.
81.5%
Humidity
87.8 km/h
Wind N
1012.5 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5
2.75 µg/m³
PM10▲
13.7 µg/m³
050100150200300500
What is the weather forecast for St. Catharines?
Temperature & Precipitation
PM2.5 Trend
46h · 1 stationPM2.52.75 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX1.4
Low
Station readings (2 stations within 25 km)
2.75
Median
2.75
Average
0.5
Low
5.0
High
PM2.5 µg/m³ · Model: 5.8 · Bias: +3.0
What is the 7-day forecast for St. Catharines?
09-05
23.5° 18.1°
1.06 mm
09-06
23.7° 18.2°
5.5 mm
09-07
21.5° 17.2°
0.19 mm
09-08
25.1° 17.2°
3.0 mm
09-09
22.0° 16.4°
8.5 mm
09-10
19.5° 17.0°
0.19 mm
09-11
22.2° 15.9°
0.62 mm
Both models agree
Avg diff: 3.7°C
Where are air quality stations near St. Catharines?
2
St. Catharines, Ontario, Canada
31
St. Catharines, Ontario, Canada
18
St. Catharines, Ontario, Canada
21
St. Catharines, Ontario, Canada
What cities are near St. Catharines?
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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 2026-09-05T12:11 UTC.