Air Quality in Diamond Bar, United States
Windy
27.3°C · 48.0% humidity
27.3°
Feels 29.1°
26
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station
Nearby Monitoring Stations
Diamond Bar's air quality — share it
AQI Forecast
83
6am
66
66
26
9am
25
33
39
12pm
43
46
49
3pm
50
51
52
6pm
53
53
53
9pm
53
66
66
12am
66
66
66
3am
66
66
Air Quality Index Trend
45h · 114 stnDiamond Bar's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
48.0%
Humidity
43.5 km/h
Wind SSW
1017.0 hPa
Pressure
6.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5
6.2 µg/m³
PM10▲
73.05 µg/m³
050100150200300500
What is the weather forecast for Diamond Bar?
Temperature & Precipitation
PM2.5 Trend
45h · 114 stationsPM2.56.2 µg/m³
✓ WHO
Good
PM1073.05 µg/m³
Moderate
UV INDEX6.9
High
Station readings (1 station within 25 km)
6.2
Median
6.2
Average
6.2
Low
6.2
High
PM2.5 µg/m³ · Model: 23.15 · Bias: +17.0
What is the 7-day forecast for Diamond Bar?
09-05
27.6° 18.6°
09-06
31.6° 17.1°
09-07
34.1° 17.9°
0.75 mm
09-08
34.1° 13.8°
0.19 mm
09-09
31.1° 15.7°
09-10
30.4° 10.8°
09-11
36.9° 16.8°
Both models agree
Avg diff: 4.6°C
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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 2026-09-05T16:32 UTC.