Air Quality in Hermiston, United States
Windy
35.1°C · 10.5% humidity
35.1°
Feels 35.1°
71
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station
Nearby Monitoring Stations
AQI Forecast
27
11am
27
27
71
2pm
59
50
43
5pm
66
62
60
8pm
58
57
56
11pm
56
55
55
2am
35
34
34
5am
54
34
34
8am
54
54
Air Quality Index Trend
48h · 5 stnHermiston'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 Hermiston is 1.4× the WHO 24-hour guideline of 15 µg/m³.
10.5%
Humidity
111.4 km/h
Wind WSW
1005.0 hPa
Pressure
24.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
21.6 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Hermiston?
Temperature & Precipitation
PM2.5 Trend
48h · 5 stationsPM2.521.6 µg/m³
×1.4 WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX24.9
Extreme
Station readings (1 station within 25 km)
21.6
Median
21.6
Average
21.6
Low
21.6
High
PM2.5 µg/m³ · Model: 6.5 · Bias: -15.1
What is the 7-day forecast for Hermiston?
07-21
38.9° 17.0°
07-22
35.1° 20.0°
07-23
43.4° 19.4°
07-24
43.6° 17.4°
07-25
34.3° 21.5°
07-26
43.2° 14.5°
07-27
37.1° 22.5°
Both models agree
Avg diff: 3.4°C
Where are air quality stations near Hermiston?
What cities are near Hermiston?
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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 2026-07-21T21:28 UTC.