Air Quality in Ontario, United States

Drizzle
13.7°C · 62.7% humidity
13.7°
Feels 13.7°
41
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model

Nearby Monitoring Stations

AQI Forecast Calibrated
49 8pm
46
42
30 11pm
45
45
45 2am
45
45
45 5am
45
45
45 8am
45
45
45 11am
45
45
45 2pm
45
45
20 5pm
20
20
Station readings
49
46
42
30
CAMS model adj -30
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
50
50
50
AD 728×90

PM2.5 Trend (24h)

26h · 2 stations
62.7%
Humidity
62.8 km/h
Wind SW
1011.0 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

What is the weather forecast for Ontario?

Temperature & Precipitation

PM2.59.78 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX0.7
Low
AD 300×250

What is the 7-day forecast for Ontario?

04-09
18.2° 9.6°
04-10
13.7° 8.0°
10.25 mm
04-11
9.0° 6.0°
28.87 mm
04-12
7.9° 2.5°
1.44 mm
04-13
10.9° 2.7°
0.38 mm
04-14
16.3° 7.2°
04-15
18.6° 11.6°
Both models agree Avg diff: 5.1°C

Where are air quality stations near Ontario?

50
Glendora-Laurel, Los Angeles
20.5 km
58
Glendora-Laurel, Los Angeles
20.5 km
50
Rubidoux - Mission Blvd, Riverside
22.8 km
30
Rubidoux - Mission Blvd, Riverside
22.8 km

What cities are near Ontario?

43 Upland 39 Chino 58 Rancho Cucamonga 33 Claremont 32 Pomona 52 La Verne 37 Chino Hills 39 Eastvale 42 Jurupa Valley 51 San Dimas

Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-09T23:58 UTC.