Air Quality in Ontario, United States

Windy
28.9°C · 17.8% humidity
28.9°
Feels 28.9°
25
Good
Air quality is satisfactory. Enjoy outdoor activities.
3 stations

Nearby Monitoring Stations

AQI Forecast
34 11am
34
34
25 2pm
28
49
51 5pm
25
32
33 8pm
33
33
34 11pm
34
34
54 2am
54
54
54 5am
54
54
54 8am
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. Current PM2.5 concentration in Ontario is 1.2× the WHO annual guideline of 5 µg/m³.

17.8%
Humidity
59.8 km/h
Wind SSW
1012.3 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
25
5.96 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Ontario?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations
PM2.55.96 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
Station readings (3 stations within 25 km)
5.96
Median
6.13
Average
2.4
Low
8.6
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +1.4

What is the 7-day forecast for Ontario?

05-28
26.2° 14.4°
05-29
28.9° 14.5°
05-30
18.3° 9.5°
05-31
26.8° 17.4°
06-01
28.5° 12.7°
06-02
26.8° 10.3°
06-03
26.4° 7.7°
Both models agree Avg diff: 4.4°C

Where are air quality stations near Ontario?

21
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 5.0 µg/m³
31
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 7.4 µg/m³
54
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 13.5 µg/m³
34
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 8.2 µg/m³
10
Glendora-Laurel, Los Angeles
20.5 km PM2.5: 2.4 µg/m³
25
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 6.0 µg/m³
36
Rubidoux - Mission Blvd, Riverside
22.8 km PM2.5: 8.6 µg/m³

What cities are near Ontario?

24 Upland 20 Chino 25 Rancho Cucamonga 20 Claremont 20 Pomona 20 La Verne 20 Chino Hills 25 Eastvale 26 Jurupa Valley 20 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 2026-05-28T21:46 UTC.