Air Quality in Sarnia, Canada
Windy
25.5°C · 62.9% humidity
25.5°
Feels 25.5°
60
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast
Nearby Monitoring Stations
Sarnia's air quality — share it
AQI Forecast
Calibrated
74
10am
72
72
60
1pm
63
66
68
4pm
69
70
70
7pm
71
70
71
10pm
72
72
72
1am
72
72
74
4am
81
101
101
7am
81
71
Station readings
18h ago
AQI 93
PM2.5 32.1 µg/m³ · 18h ago
CAMS model
adj +47
27
25
25
25
25
25
25
25
25
25
25
24
25
25
25
25
25
25
27
34
54
54
34
24
Air Quality Index Trend
8h · 1 stnSarnia's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Sarnia is 1.1× the WHO 24-hour guideline of 15 µg/m³.
62.9%
Humidity
53.7 km/h
Wind NNE
1014.4 hPa
Pressure
5.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
16.55 µg/m³
PM10
34.3 µg/m³
050100150200300500
What is the weather forecast for Sarnia?
Temperature & Precipitation
PM2.5 Trend
8h · 1 stationPM2.516.55 µg/m³
×1.1 WHO
Moderate
PM1034.3 µg/m³
Good
UV INDEX5.9
High
What is the 7-day forecast for Sarnia?
07-21
25.5° 20.9°
5.44 mm
07-22
24.1° 19.3°
0.25 mm
07-23
22.5° 15.7°
0.13 mm
07-24
22.8° 15.8°
0.06 mm
07-25
20.9° 15.7°
10.5 mm
07-26
27.2° 16.8°
0.13 mm
07-27
28.2° 21.2°
0.25 mm
Both models agree
Avg diff: 3.5°C
Where are air quality stations near Sarnia?
33
Sarnia, Ontario, Canada
81
Port Huron, Michigan, USA
32
Port Huron, Michigan, USA
9
Port Huron, Michigan, USA
What cities are near Sarnia?
Get AQI alerts for Sarnia
Notify me when air quality reaches:
Free · No account · Unsubscribe any time
Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T17:17 UTC.