Air Quality in Diamond Bar, United States

Windy
27.8°C · 26.3% humidity
27.8°
Feels 27.8°
70
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station

Nearby Monitoring Stations

AQI Forecast
54 2pm
54
54
70 5pm
65
62
60 8pm
58
57
56 11pm
56
55
55 2am
55
54
54 5am
54
54
54 8am
54
54
54 11am
54
54
AD 728×90

Air Quality Index Trend

48h · 2 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 1.4× the WHO 24-hour guideline of 15 µg/m³.

26.3%
Humidity
46.5 km/h
Wind S
1009.6 hPa
Pressure
6.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
70
21.1 µg/m³
PM10
31
34.3 µg/m³
050100150200300500

What is the weather forecast for Diamond Bar?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations
PM2.521.1 µg/m³ ×1.4 WHO
Moderate
PM1034.3 µg/m³
Good
UV INDEX6.9
High
AD 300×250
Station readings (1 station within 25 km)
21.1
Median
21.1
Average
21.1
Low
21.1
High
PM2.5 µg/m³ · Model: 13.5 · Bias: -7.6

What is the 7-day forecast for Diamond Bar?

06-09
27.8° 13.9°
06-10
29.4° 15.5°
06-11
26.5° 15.5°
06-12
29.9° 16.2°
0.19 mm
06-13
33.1° 17.1°
06-14
28.2° 19.1°
06-15
25.6° 8.9°
Both models agree Avg diff: 2.7°C

Where are air quality stations near Diamond Bar?

19
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 4.6 µg/m³
53
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 13.1 µg/m³
14
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 3.4 µg/m³
15
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 3.6 µg/m³
40
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 9.6 µg/m³

What cities are near Diamond Bar?

70 Walnut 70 Pomona 70 Chino Hills 70 San Dimas 60 South San Jose Hills 70 La Verne 66 Covina 62 Rowland Heights 70 Claremont 70 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 2026-06-09T00:51 UTC.