Air Quality in Diamond Bar, United States

Clear
22.7°C · 44.8% humidity
22.7°
Feels 22.7°
52
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast
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Air Quality Index Trend

45h · 105 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.

44.8%
Humidity
35.5 km/h
Wind SSW
1013.6 hPa
Pressure
0.0
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
52
12.5 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Diamond Bar?

Temperature & Precipitation

PM2.5 Trend

45h · 105 stations
PM2.512.5 µg/m³ ✓ WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX0.0
Low
Station readings (2 stations within 25 km)
12.5
Median
12.5
Average
11.0
Low
14.0
High
PM2.5 µg/m³ · Model: 13.5 · Bias: +1.0

What is the 7-day forecast for Diamond Bar?

10-21
22.7° 13.4°
10-22
27.8° 16.0°
10-23
23.4° 14.8°
10-24
23.1° 12.7°
0.25 mm
10-25
24.7° 6.9°
10-26
23.6° 13.5°
1.63 mm
10-27
22.6° 11.3°
0.62 mm
Both models agree Avg diff: 4.4°C

Where are air quality stations near Diamond Bar?

46
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 11.0 µg/m³
55
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 14.0 µg/m³

What cities are near Diamond Bar?

52 Walnut 52 Pomona 52 Chino Hills 52 San Dimas 42 South San Jose Hills 52 La Verne 49 Covina 47 Rowland Heights 52 Claremont 52 Chino
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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 2026-10-21T01:06 UTC.