Air Quality Rankings for Oregon 2026

Oregon has 23 cities with EPA air quality data. Benton, Oregon has the cleanest air with a 5-year average AQI of 22. Lane, Oregon has the highest AQI at 45.

#	City	5yr Avg AQI	Current AQI	Worst Pollutant	Trend	Grade
1	Benton, Oregon	22	21	PM2.5	Stable	B
2	Wasco, Oregon	24	27	PM2.5	Improving	B
3	Deschutes, Oregon	25	28	PM2.5	Improving	B
4	Union, Oregon	27	26	PM2.5	Improving	B
5	Wallowa, Oregon	27	25	PM2.5	Stable	B
6	Lake, Oregon	27	28	PM2.5	Stable	B
7	Jefferson, Oregon	28	31	PM2.5	Improving	A
8	Crook, Oregon	29	33	PM2.5	Improving	B
9	Columbia, Oregon	29	29	PM2.5	Stable	B
10	Baker, Oregon	31	30	PM2.5	Stable	B
11	Clackamas, Oregon	32	34	PM2.5	Stable	B
12	Linn, Oregon	35	34	PM2.5	Worsening	C
13	Douglas, Oregon	36	53	PM2.5	Worsening	C
14	Washington, Oregon	36	36	PM2.5	Stable	B
15	Multnomah, Oregon	36	38	PM2.5	Stable	B
16	Marion, Oregon	37	38	PM2.5	Worsening	C
17	Josephine, Oregon	38	44	PM2.5	Worsening	C
18	Umatilla, Oregon	39	42	PM2.5	Stable	C
19	Harney, Oregon	44	43	PM2.5	Worsening	C
20	Jackson, Oregon	44	45	PM2.5	Stable	C
21	Klamath, Oregon	44	39	PM2.5	Stable	C
22	Grant, Oregon	45	44	PM2.5	Worsening	C
23	Lane, Oregon	45	49	PM2.5	Stable	C

Air quality data for Oregon is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
— EPA Air Quality System

Frequently Asked Questions

Benton, Oregon has the best air quality in Oregon with a 5-year average AQI of 22 and a grade of B.

Oregon has 23 cities with EPA air quality monitoring data in our database, covering multiple years of AQI measurements.

The Air Quality Index (AQI) measures five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Lower AQI values indicate cleaner air — 0-50 is "Good," while 150+ is "Unhealthy."

Sources: EPA Air Quality System (AQS)

Cities ranked by 5-year average AQI (lower is better). Grades factor in average AQI, trend direction, unhealthy days, and dominant pollutant.

Cleanest Cities Nationwide →All Air Quality in Oregon →