Air Quality in Guelph, Canada
Windy
24.0°C · 63.8% humidity
24.0°
Feels 24.0°
114
Unhealthy for sensitive groups
Sensitive groups should reduce prolonged outdoor exertion.
Model forecast
Nearby Monitoring Stations
Guelph's air quality — share it
AQI Forecast
Calibrated
19
10am
19
19
114
1pm
87
68
54
4pm
44
37
30
7pm
26
24
22
10pm
20
19
19
1am
18
18
18
4am
17
17
19
7am
17
16
Station readings
18h ago
AQI 91
PM2.5 31.1 µg/m³ · 18h ago
CAMS model
adj -8
27
27
27
27
27
27
27
27
27
25
25
25
25
25
25
25
25
25
25
25
25
27
25
24
Air Quality Index Trend
8h · 2 stnGuelph'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 Guelph is 2.7× the WHO 24-hour guideline of 15 µg/m³.
63.8%
Humidity
44.6 km/h
Wind E
1015.1 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
40.72 µg/m³
PM10
84.3 µg/m³
050100150200300500
What is the weather forecast for Guelph?
Temperature & Precipitation
PM2.5 Trend
8h · 2 stationsPM2.540.72 µg/m³
×2.7 WHO
Unhealthy for sensitive groups
PM1084.3 µg/m³
Moderate
UV INDEX17.4
Extreme
What is the 7-day forecast for Guelph?
07-21
24.0° 19.3°
5.87 mm
07-22
23.6° 17.6°
0.06 mm
07-23
19.7° 14.6°
07-24
22.6° 16.1°
07-25
24.1° 14.1°
1.25 mm
07-26
26.4° 16.6°
2.06 mm
07-27
28.0° 18.8°
0.38 mm
Both models agree
Avg diff: 2.9°C
Where are air quality stations near Guelph?
46
Guelph, Ontario, Canada
30
Guelph, Ontario, Canada
28
Kitchener, Ontario, Canada
13
Kitchener, Ontario, Canada
36
Kitchener, Ontario, Canada
What cities are near Guelph?
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T17:18 UTC.