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
AD 728×90

Air Quality Index Trend

48h · 2 stn

Ontario'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▲
38
9.24 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Ontario?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations
PM2.59.24 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
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
20.5 km PM2.5: 9.4 µg/m³
15
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 3.6 µg/m³
22
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 5.3 µg/m³
52
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 12.6 µg/m³
14
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 3.4 µg/m³
45
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 10.8 µg/m³
44
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 10.6 µg/m³

What cities are near Ontario?

40 Upland 47 Chino 44 Rancho Cucamonga 47 Claremont 47 Pomona 47 La Verne 47 Chino Hills 35 Eastvale 37 Jurupa Valley 47 San Dimas
Get AQI alerts for Ontario

Notify me when air quality reaches:

Free · No account · Unsubscribe any time

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.