Air Quality in Ontario, United States

Windy
30.5°C · 22.7% humidity
30.5°
Feels 30.5°
54
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast

Nearby Monitoring Stations

AQI Forecast
54 7am
54
54
54 10am
54
54
54 1pm
54
54
54 4pm
54
66
54 7pm
54
54
54 10pm
54
54
54 1am
54
54
66 4am
66
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.

22.7%
Humidity
49.4 km/h
Wind SSW
1009.8 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
54
13.5 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Ontario?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations
PM2.513.5 µg/m³ ✓ WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX9.4
Very High
AD 300×250
Both models agree Avg diff: 3.3°C

Where are air quality stations near Ontario?

40
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 9.6 µg/m³
168
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 88.4 µg/m³
260
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 210.0 µg/m³
153
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 59.4 µg/m³
227
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 176.7 µg/m³
165
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 82.6 µg/m³
57
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 15.0 µg/m³

What cities are near Ontario?

54 Upland 54 Chino 43 Rancho Cucamonga 45 Claremont 45 Pomona 54 La Verne 45 Chino Hills 35 Eastvale 37 Jurupa Valley 54 San Dimas
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T17:13 UTC.