Air Quality in Diamond Bar, United States

Windy
30.1°C · 16.7% humidity
30.1°
Feels 30.1°
45
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast

Nearby Monitoring Stations

AQI Forecast
34 12pm
54
54
45 3pm
48
49
31 6pm
32
52
53 9pm
53
53
54 12am
54
54
54 3am
54
54
54 6am
54
54
54 9am
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 2.2× the WHO annual guideline of 5 µg/m³.

16.7%
Humidity
47.4 km/h
Wind SSW
1011.5 hPa
Pressure
14.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
45
10.85 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Diamond Bar?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations
PM2.510.85 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX14.9
Extreme
AD 300×250

What is the 7-day forecast for Diamond Bar?

05-28
27.4° 13.8°
05-29
30.1° 14.6°
05-30
19.6° 8.8°
05-31
27.6° 16.6°
06-01
29.9° 11.8°
06-02
28.3° 10.6°
06-03
27.2° 7.2°
Both models agree Avg diff: 3.4°C

Where are air quality stations near Diamond Bar?

36
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 8.6 µg/m³
21
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 5.0 µg/m³
10
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 2.4 µg/m³
31
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 7.4 µg/m³
54
Glendora-Laurel, Los Angeles
13.4 km PM2.5: 13.5 µg/m³

What cities are near Diamond Bar?

45 Walnut 34 Pomona 34 Chino Hills 54 San Dimas 20 South San Jose Hills 45 La Verne 17 Covina 20 Rowland Heights 34 Claremont 34 Chino
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-28T22:52 UTC.