# Counties in Oregon by share of days with good air quality (US EPA AQI), 2022

All 23 values come from U.S. Environmental Protection Agency for 2022, so the places are comparable. 3 counties have no value for that period and are not ranked.

- Indicator id: `aqi_good_days_share`
- Unit: %
- Definition: Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual)
- Retrieved: 2026-10-12
- Citation: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/good-air-quality-days-share/oregon-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Wasco County | 100 |
| 2 | Benton County | 88.8 |
| 3 | Columbia County | 80.9 |
| 4 | Crook County | 80.2 |
| 5 | Wallowa County | 78.7 |
| 6 | Clackamas County | 78.6 |
| 7 | Union County | 78.4 |
| 8 | Baker County | 77.5 |
| 9 | Deschutes County | 77.3 |
| 10 | Lake County | 74.8 |
| 11 | Jefferson County | 74.5 |
| 12 | Multnomah County | 72.9 |
| 13 | Linn County | 69.6 |
| 13 | Marion County | 69.6 |
| 15 | Umatilla County | 66.8 |
| 15 | Washington County | 66.8 |
| 17 | Harney County | 61.9 |
| 18 | Klamath County | 60.8 |
| 19 | Jackson County | 57.8 |
| 20 | Josephine County | 57 |
| 21 | Grant County | 54.2 |
| 22 | Lane County | 53.2 |
| 23 | Douglas County | 45.7 |