Air Quality in Walnut, United States

Clear
18.7°C · 30.4% humidity
18.7°
Feels 18.7°
52
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station

Nearby Monitoring Stations

AQI Forecast Calibrated
31 6pm
31
31
52 9pm
46
42
39 12am
37
35
34 3am
33
32
32 6am
32
32
31 9am
31
31
31 12pm
31
31
31 3pm
31
31
Station readings
25
21
33
33
CAMS model adj -23
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
54
AD 728×90

Air Quality Index Trend

48h · 1 stn

Walnut's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

30.4%
Humidity
30.9 km/h
Wind N
1011.3 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

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

What is the weather forecast for Walnut?

Temperature & Precipitation

PM2.5 Trend

48h · 1 station
PM2.512.6 µg/m³ ✓ WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (1 station within 25 km)
12.6
Median
12.6
Average
12.6
Low
12.6
High
PM2.5 µg/m³ · Model: 10.0 · Bias: -2.6

What is the 7-day forecast for Walnut?

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 Walnut?

29
Glendora-Laurel, Los Angeles
13.9 km PM2.5: 7.0 µg/m³
46
Glendora-Laurel, Los Angeles
13.9 km PM2.5: 11.0 µg/m³
51
Glendora-Laurel, Los Angeles
13.9 km PM2.5: 12.1 µg/m³
14
Glendora-Laurel, Los Angeles
13.9 km PM2.5: 3.4 µg/m³
24
Glendora-Laurel, Los Angeles
13.9 km PM2.5: 5.8 µg/m³
33
united-states-of-america-san-marino-sierra-madre-boulevard
25.2 km 25.1°C 47.0% RH PM2.5: 8.0 µg/m³ PM10: 9.0 µg/m³

What cities are near Walnut?

45 South San Jose Hills 52 Diamond Bar 50 Rowland Heights 38 Valinda 38 La Puente 49 Covina 38 West Covina 38 Hacienda Heights 36 West Puente Valley 42 Vincent
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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 2026-06-09T04:59 UTC.