Air Quality in St. Thomas, Canada
Windy
14.7°C · 97.2% humidity
14.7°
Feels 14.7°
20
Good
Air quality is satisfactory. Enjoy outdoor activities.
3 stations
Nearby Monitoring Stations
St. Thomas's air quality — share it
AQI Forecast
Calibrated
28
5am
20
20
20
8am
21
22
23
11am
24
24
24
2pm
25
25
25
5pm
25
26
26
8pm
28
28
28
11pm
35
35
35
2am
28
28
Station readings
28
20
20
21
CAMS model
adj +1
24
24
24
24
24
24
24
24
24
24
24
24
24
24
25
25
27
27
27
34
34
34
27
27
Air Quality Index Trend
47h · 1 stnSt. Thomas's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
97.2%
Humidity
40.2 km/h
Wind NNW
1014.0 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
4.9 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for St. Thomas?
Temperature & Precipitation
PM2.5 Trend
47h · 1 stationPM2.54.9 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX1.4
Low
Station readings (3 stations within 25 km)
4.9
Median
4.7
Average
4.1
Low
5.0
High
PM2.5 µg/m³ · Model: 5.9 · Bias: +1.0
What is the 7-day forecast for St. Thomas?
09-05
23.7° 14.6°
0.25 mm
09-06
24.0° 15.1°
0.13 mm
09-07
22.5° 12.6°
4.19 mm
09-08
23.0° 14.0°
4.19 mm
09-09
24.6° 12.8°
2.75 mm
09-10
22.6° 13.8°
0.94 mm
09-11
26.7° 12.3°
0.88 mm
Both models agree
Avg diff: 4.2°C
Where are air quality stations near St. Thomas?
33
Port Stanley, Ontario, Canada
21
Port Stanley, Ontario, Canada
21
Port Stanley, Ontario, Canada
21
London, Ontario, Canada
17
London, Ontario, Canada
What cities are near St. Thomas?
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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.