Air Quality in Diamond Bar, United States

Windy
31.1°C · 24.6% humidity
31.1°
Feels 31.1°
74
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast

Nearby Monitoring Stations

AQI Forecast
66 3pm
66
66
74 6pm
72
70
69 9pm
68
56
55 12am
55
55
54 3am
54
66
66 6am
66
54
66 9am
66
66
66 12pm
66
66
AD 728×90

Air Quality Index Trend

45h · 107 stn

Diamond 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. Current PM2.5 concentration in Diamond Bar is 1.5× the WHO 24-hour guideline of 15 µg/m³.

24.6%
Humidity
46.3 km/h
Wind S
1011.3 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
74
23.15 µg/m³
PM10
60
73.05 µg/m³
050100150200300500

What is the weather forecast for Diamond Bar?

Temperature & Precipitation

PM2.5 Trend

45h · 107 stations
PM2.523.15 µg/m³ ×1.5 WHO
Moderate
PM1073.05 µg/m³
Moderate
UV INDEX17.4
Extreme
AD 300×250

What is the 7-day forecast for Diamond Bar?

08-03
33.1° 17.6°
08-04
28.5° 19.2°
0.13 mm
08-05
34.3° 19.9°
08-06
33.3° 16.1°
08-07
30.6° 17.8°
08-08
28.2° 15.3°
08-09
33.1° 15.2°
Both models agree Avg diff: 3.4°C

Where are air quality stations near Diamond Bar?

90
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 30.6 µg/m³
98
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 34.4 µg/m³
94
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 32.5 µg/m³

What cities are near Diamond Bar?

74 Walnut 68 Pomona 68 Chino Hills 75 San Dimas 42 South San Jose Hills 69 La Verne 42 Covina 75 Rowland Heights 68 Claremont 60 Chino
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T01:00 UTC.