Air Quality in Ontario, United States

Windy
30.6°C · 22.5% humidity
30.6°
Feels 30.6°
60
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast

Nearby Monitoring Stations

AQI Forecast
54 1pm
54
54
60 4pm
58
57
56 7pm
56
55
55 10pm
55
54
54 1am
54
54
54 4am
66
66
66 7am
66
54
54 10am
54
54
AD 728×90

Air Quality Index Trend

46h · 25 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. Current PM2.5 concentration in Ontario is 1.1× the WHO 24-hour guideline of 15 µg/m³.

22.5%
Humidity
48.9 km/h
Wind S
1012.2 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
60
16.35 µg/m³
PM10
38
41.15 µg/m³
050100150200300500

What is the weather forecast for Ontario?

Temperature & Precipitation

PM2.5 Trend

46h · 25 stations
PM2.516.35 µg/m³ ×1.1 WHO
Moderate
PM1041.15 µg/m³
Good
UV INDEX17.4
Extreme
AD 300×250

What is the 7-day forecast for Ontario?

08-03
31.4° 20.0°
08-04
27.7° 20.0°
0.44 mm
08-05
32.8° 20.6°
0.5 mm
08-06
31.8° 17.9°
08-07
30.0° 19.1°
08-08
27.6° 16.2°
08-09
32.3° 16.9°
Both models agree Avg diff: 4.4°C

Where are air quality stations near Ontario?

51
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 12.1 µg/m³
90
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 30.6 µg/m³
94
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 32.5 µg/m³
84
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 27.8 µg/m³
74
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 23.0 µg/m³

What cities are near Ontario?

60 Upland 60 Chino 68 Rancho Cucamonga 68 Claremont 68 Pomona 69 La Verne 68 Chino Hills 60 Eastvale 60 Jurupa Valley 75 San Dimas
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-07T23:57 UTC.