What is the air quality trend in Hermiston?

Over the past 7 days, Hermiston had an average AQI of 96 based on station measurements. The worst day was 2026-08-05 with AQI 153.

How is Hermiston air quality measured?

Air quality in Hermiston is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Hermiston, United States

Name: Hermiston Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Hermiston, United States.

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 8 stations

Temperature GFS model

27pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-07	128	77–168	49.0 µg/m³	22h	6
2026-08-06	145	118–161	55.9 µg/m³	24h	7
2026-08-05	153	124–165	64.9 µg/m³	24h	6
2026-08-04	141	89–169	61.6 µg/m³	24h	7
2026-08-03	53	8–158	17.4 µg/m³	24h	6
2026-08-02	17	8–28	4.2 µg/m³	24h	7
2026-08-01	38	10–81	9.8 µg/m³	23h	7

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