What is the air quality trend in Hermiston?

Over the past 8 days, Hermiston had an average AQI of 54 based on station measurements. The worst day was 2026-07-21 with AQI 87.

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 Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 5 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	79	77–81	25.6 µg/m³	5h	6
2026-07-21	87	57–135	28.9 µg/m³	24h	6
2026-07-20	56	22–100	16.2 µg/m³	24h	7
2026-07-19	42	18–80	11.5 µg/m³	24h	8
2026-07-18	38	14–78	9.8 µg/m³	24h	8
2026-07-17	58	25–115	16.7 µg/m³	24h	8
2026-07-16	45	23–122	12.2 µg/m³	24h	8
2026-07-15	32	23–63	7.7 µg/m³	19h	8

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