What is the air quality trend in Hermiston?

Over the past 2 days, Hermiston had an average AQI of 138 based on station measurements. The worst day was 2026-08-06 with AQI 145.

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

45h

PM2.5 Station

45h · 7 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-07	131	65–168	50.8 µg/m³	23h	6
2026-08-06	145	115–158	55.3 µg/m³	22h	7

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