Air Quality in Walnut, 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
Walnut's air quality — share it
AQI Forecast
Calibrated
34
4pm
34
34
74
7pm
63
55
49
10pm
33
30
27
1am
26
25
24
4am
35
35
35
7am
23
34
34
10am
34
34
34
1pm
34
34
Station readings
38
33
25
CAMS model
adj -32
66
66
66
66
66
66
66
54
54
54
54
54
54
66
66
66
54
66
66
66
66
66
66
66
Air Quality Index Trend
47h · 1 stnWalnut'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 Walnut 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▲
23.15 µg/m³
PM10
73.05 µg/m³
050100150200300500
What is the weather forecast for Walnut?
Temperature & Precipitation
PM2.5 Trend
47h · 1 stationPM2.523.15 µg/m³
×1.5 WHO
Moderate
PM1073.05 µg/m³
Moderate
UV INDEX17.4
Extreme
What is the 7-day forecast for Walnut?
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 Walnut?
98
Glendora-Laurel, Los Angeles
29
Glendora-Laurel, Los Angeles
94
Glendora-Laurel, Los Angeles
25
united-states-of-america-san-marino-sierra-madre-boulevard
What cities are near Walnut?
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T02:58 UTC.