Air Quality in Ontario, United States

Clear
18.4°C · 35.5% humidity
18.4°
Feels 18.4°
40
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations

Nearby Monitoring Stations

AQI Forecast
54 8pm
54
54
40 11pm
44
47
49 2am
50
51
52 5am
53
53
53 8am
54
54
54 11am
54
54
54 2pm
54
54
54 5pm
34
34
AD 728×90

Air Quality Index Trend

49h · 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.

35.5%
Humidity
15.8 km/h
Wind N
1012.0 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
40
9.72 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Ontario?

Temperature & Precipitation

PM2.5 Trend

49h · 2 stations
PM2.59.72 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (2 stations within 25 km)
9.72
Median
10.0
Average
7.4
Low
12.6
High
PM2.5 µg/m³ · Model: 10.0 · Bias: +0.3

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?

60
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 16.4 µg/m³
15
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 3.6 µg/m³
19
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 4.6 µg/m³
51
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 12.1 µg/m³
14
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 3.4 µg/m³
49
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 11.8 µg/m³
18
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 4.3 µg/m³

What cities are near Ontario?

39 Upland 31 Chino 45 Rancho Cucamonga 31 Claremont 31 Pomona 31 La Verne 31 Chino Hills 43 Eastvale 45 Jurupa Valley 31 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 2026-06-09T06:37 UTC.