Air Quality in St. Thomas, Canada

Windy
25.5°C · 30.2% humidity
25.5°
Feels 25.5°
42
Good
Air quality is satisfactory. Enjoy outdoor activities.
3 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
41 4pm
42
43
42 7pm
41
41
41 10pm
41
41
41 1am
41
41
43 4am
43
41
41 7am
41
40
40 10am
40
40
40 1pm
40
40
Station readings
41
42
43
43
CAMS model adj +16
25
25
25
25
25
25
25
25
25
25
25
25
27
27
25
25
25
24
24
24
24
24
24
24
AD 728×90

Air Quality Index Trend

28h · 2 stn

St. 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.

30.2%
Humidity
90.0 km/h
Wind NNW
1014.4 hPa
Pressure
2.9
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
42
10.07 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for St. Thomas?

Temperature & Precipitation

PM2.5 Trend

28h · 2 stations
PM2.510.07 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX2.9
Moderate
AD 300×250
Station readings (3 stations within 25 km)
10.07
Median
9.83
Average
9.1
Low
10.3
High
PM2.5 µg/m³ · Model: 9.75 · Bias: -0.3

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

08-03
25.5° 20.6°
18.12 mm
08-04
33.7° 17.4°
1.75 mm
08-05
33.7° 13.5°
08-06
27.2° 18.2°
9.69 mm
08-07
28.0° 12.4°
0.94 mm
08-08
33.3° 15.9°
1.13 mm
08-09
32.2° 22.0°
Both models agree Avg diff: 3.7°C

Where are air quality stations near St. Thomas?

44
Port Stanley, Ontario, Canada
11.4 km PM2.5: 10.6 µg/m³
34
Port Stanley, Ontario, Canada
11.4 km PM2.5: 8.2 µg/m³
50
Port Stanley, Ontario, Canada
11.4 km PM2.5: 12.0 µg/m³
38
Port Stanley, Ontario, Canada
11.4 km PM2.5: 9.1 µg/m³
38
Port Stanley, Ontario, Canada
11.4 km PM2.5: 9.1 µg/m³
42
Port Stanley, Ontario, Canada
11.4 km PM2.5: 10.1 µg/m³
44
Port Stanley, Ontario, Canada
11.4 km PM2.5: 10.6 µg/m³
50
Port Stanley, Ontario, Canada
11.4 km PM2.5: 12.0 µg/m³
40
London, Ontario, Canada
22.4 km PM2.5: 9.6 µg/m³
33
London, Ontario, Canada
22.4 km PM2.5: 7.9 µg/m³

What cities are near St. Thomas?

38 London 44 Tillsonburg 38 Strathroy 34 Woodstock 40 Norfolk County 33 Stratford 46 Brant 46 Brantford 34 Forest Heights 34 Kitchener
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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 2026-08-07T23:45 UTC.