Air Quality in Ajax, Canada
Clear
28.0°C · 42.7% humidity
28.0°
Feels 29.3°
116
Unhealthy for sensitive groups
Sensitive groups should reduce prolonged outdoor exertion.
Model forecast
Nearby Monitoring Stations
Ajax's air quality — share it
AQI Forecast
Calibrated
117
10am
117
117
116
1pm
117
117
117
4pm
117
117
137
7pm
117
108
108
10pm
108
110
117
1am
117
110
110
4am
110
108
108
7am
110
107
Station readings
119
126
114
CAMS model
adj +83
34
34
34
34
34
34
34
34
34
54
34
25
25
25
27
34
34
27
27
27
25
25
27
24
Air Quality Index Trend
38h · 1 stnAjax'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 Ajax is 2.8× the WHO 24-hour guideline of 15 µg/m³.
42.7%
Humidity
28.3 km/h
Wind ESE
1014.5 hPa
Pressure
12.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
41.58 µg/m³
PM10
84.3 µg/m³
050100150200300500
What is the weather forecast for Ajax?
Temperature & Precipitation
PM2.5 Trend
38h · 1 stationPM2.541.58 µg/m³
×2.8 WHO
Unhealthy for sensitive groups
PM1084.3 µg/m³
Moderate
UV INDEX12.9
Extreme
What is the 7-day forecast for Ajax?
07-21
28.0° 20.4°
1.44 mm
07-22
24.4° 18.3°
0.56 mm
07-23
19.3° 14.6°
07-24
22.6° 16.5°
07-25
25.3° 14.3°
0.81 mm
07-26
27.1° 17.9°
0.75 mm
07-27
29.1° 19.5°
Both models agree
Avg diff: 2.9°C
Where are air quality stations near Ajax?
38
Oshawa, Ontario, Canada
27
Oshawa, Ontario, Canada
44
Oshawa, Ontario, Canada
39
Toronto East, Ontario, Canada
33
Toronto East, Ontario, Canada
26
Toronto East, Ontario, Canada
114
Wood Glen
What cities are near Ajax?
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T17:17 UTC.