Bad Air Days in Coos County, Oregon
Not enough data
EPA monitors in Coos County ran on too few days between 2016 and 2025 to give a fair yearly count (about 29% of days covered). Neighbouring counties below are a better guide.
What actually helps here
- EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.
Better or worse than it was
| Date | AQI | Main pollutant |
|---|---|---|
| 2019-08-26 | 63 | PM2.5 |
| 2019-08-27 | 55 | PM2.5 |
| 2019-05-28 | 53 | PM2.5 |
| 2019-08-05 | 53 | PM2.5 |
| 2019-05-07 | 52 | PM2.5 |
The air on a normal day
Across 107 monitored days from 2019 to 2019, the air in Coos County rated Good on 93% of them, more often than the 72% typical of monitored counties, and Moderate on 7%. The median day sat at AQI 25; one day in ten went above 47.
The pollutant setting the AQI on an ordinary day here:
- fine particles (PM2.5)100%107 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2019 | 107 | 99 | 8 | 0 | 0 | 25 | 63 |
| 2013 | 186 | 182 | 4 | 0 | 0 | 13 | 62 |
| 2012 | 278 | 272 | 5 | 1 | 0 | 23 | 143 |
| 2011 | 45 | 41 | 4 | 0 | 0 | 32 | 58 |
Nearby counties on file
- Klamath County20/yr
- Josephine County17/yr
- Jackson County16/yr
- Lane County16/yr
- Deschutes County14/yr
- Lake County10/yr
- Harney County7/yr
- Crook County7/yr
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.