Air Quality in Ontario, United States
Windy
26.4°C · 24.4% humidity
26.4°
Feels 26.4°
38
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations
Nearby Monitoring Stations
AQI Forecast
54
4pm
54
54
38
7pm
43
46
48
10pm
50
51
52
1am
52
53
53
4am
53
54
54
7am
54
54
54
10am
54
54
54
1pm
54
54
Air Quality Index Trend
48h · 2 stnOntario's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
24.4%
Humidity
57.0 km/h
Wind SSW
1010.6 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
9.24 µg/m³
PM10
27.4 µg/m³
050100150200300500
What is the weather forecast for Ontario?
Temperature & Precipitation
PM2.5 Trend
48h · 2 stationsPM2.59.24 µg/m³
✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX0.7
Low
Station readings (2 stations within 25 km)
9.24
Median
9.0
Average
6.7
Low
11.3
High
PM2.5 µg/m³ · Model: 13.5 · Bias: +4.3
What is the 7-day forecast for Ontario?
06-09
26.4° 13.8°
06-10
29.0° 16.6°
06-11
25.5° 16.6°
06-12
28.6° 17.8°
0.19 mm
06-13
32.0° 17.9°
06-14
27.2° 20.1°
06-15
24.8° 10.1°
0.06 mm
Both models agree
Avg diff: 3.3°C
Where are air quality stations near Ontario?
39
Glendora-Laurel, Los Angeles
15
Glendora-Laurel, Los Angeles
22
Glendora-Laurel, Los Angeles
52
Glendora-Laurel, Los Angeles
14
Glendora-Laurel, Los Angeles
45
Rubidoux - Mission Blvd, Riverside
44
Rubidoux - Mission Blvd, Riverside
What cities are near Ontario?
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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 2026-06-09T02:16 UTC.