Air Quality in Ontario, United States

Windy
26.4°C · 24.4% humidity
26.4°
Feels 26.4°
7
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station

Nearby Monitoring Stations

AQI Forecast
54 4pm
54
54
7 7pm
20
30
37 10pm
42
45
48 1am
49
51
52 4am
52
53
53 7am
53
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
7
1.7 µg/m³
PM10▲
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Ontario?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations
PM2.51.7 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (1 station within 25 km)
1.7
Median
1.7
Average
1.7
Low
1.7
High
PM2.5 µg/m³ · Model: 13.5 · Bias: +11.8

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?

15
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 3.6 µg/m³
14
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 3.4 µg/m³
40
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 9.6 µg/m³
19
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 4.6 µg/m³
47
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 11.3 µg/m³
45
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 10.8 µg/m³
12
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 2.9 µg/m³

What cities are near Ontario?

7 Upland 7 Chino 7 Rancho Cucamonga 7 Claremont 7 Pomona 7 La Verne 7 Chino Hills 54 Eastvale 54 Jurupa Valley 7 San Dimas
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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 2026-06-09T02:11 UTC.