What is the air quality trend in Hermiston?

Over the past 15 days, Hermiston had an average AQI of 35 based on station measurements. The worst day was 2026-07-21 with AQI 90.

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

336h

PM2.5 Station

336h · 5 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	88	73–117	29.4 µg/m³	4h	6
2026-07-21	90	57–154	30.3 µg/m³	24h	6
2026-07-20	53	23–93	14.8 µg/m³	24h	8
2026-07-19	35	18–80	8.8 µg/m³	24h	8
2026-07-18	38	14–70	9.6 µg/m³	24h	8
2026-07-17	49	23–84	13.2 µg/m³	24h	9
2026-07-16	43	24–120	11.3 µg/m³	24h	8
2026-07-15	30	19–63	7.2 µg/m³	24h	8
2026-07-14	22	9–30	5.2 µg/m³	24h	8
2026-07-13	18	6–37	4.3 µg/m³	24h	8
2026-07-12	14	5–43	3.2 µg/m³	24h	8
2026-07-11	13	7–19	3.1 µg/m³	24h	8
2026-07-10	13	7–18	3.0 µg/m³	24h	8
2026-07-09	12	9–20	2.9 µg/m³	24h	9
2026-07-08	17	11–22	4.1 µg/m³	20h	9

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