What is the air quality trend in Oregon?

Over the past 15 days, Oregon had an average AQI of 42 based on station measurements. The worst day was 2026-08-04 with AQI 61.

How is Oregon air quality measured?

Air quality in Oregon 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 Oregon, United States

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

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

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

241h

PM2.5 Station

241h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	31	18–40	7.4 µg/m³	3h	2
2026-08-07	44	20–154	11.9 µg/m³	19h	2
2026-08-06	50	5–91	13.7 µg/m³	17h	1
2026-08-05	58	16–110	16.5 µg/m³	17h	2
2026-08-04	61	8–124	19.2 µg/m³	19h	2
2026-08-03	41	9–134	11.4 µg/m³	13h	2
2026-08-02	38	14–76	9.6 µg/m³	17h	2
2026-08-01	42	15–60	10.5 µg/m³	17h	2
2026-07-31	33	12–48	8.0 µg/m³	17h	2
2026-07-30	28	15–60	6.8 µg/m³	14h	2
2026-07-29	39	12–68	9.6 µg/m³	20h	2
2026-07-28	50	25–66	12.8 µg/m³	21h	2
2026-07-27	48	23–64	12.1 µg/m³	18h	2
2026-07-26	35	14–62	8.7 µg/m³	17h	2
2026-07-25	36	25–45	8.6 µg/m³	12h	2

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