Bad Air Days in Warren County, Iowa
Not enough data
EPA monitors in Warren County ran on too few days between 2016 and 2025 to give a fair yearly count (about 43% of days covered). Neighbouring counties below are a better guide.
What to buy, and what not to
- EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.
The worst days on file
| Date | AQI | Main pollutant |
|---|---|---|
| 2016-05-21 | 71 | Ozone |
| 2017-05-15 | 67 | Ozone |
| 2017-06-04 | 67 | Ozone |
| 2017-06-10 | 64 | Ozone |
| 2016-06-19 | 61 | Ozone |
The air on a normal day
Across 317 monitored days from 2016 to 2017, the air in Warren 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 35; one day in ten went above 47.
The pollutant setting the AQI on an ordinary day here:
- ozone100%317 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2017 | 105 | 91 | 14 | 0 | 0 | 39 | 67 |
| 2016 | 212 | 203 | 9 | 0 | 0 | 33 | 71 |
| 2015 | 214 | 204 | 10 | 0 | 0 | 35 | 80 |
| 2014 | 213 | 199 | 14 | 0 | 0 | 35 | 100 |
| 2013 | 212 | 192 | 20 | 0 | 0 | 40 | 77 |
| 2012 | 214 | 160 | 52 | 2 | 0 | 43 | 108 |
| 2011 | 214 | 196 | 18 | 0 | 0 | 39 | 93 |
| 2010 | 214 | 187 | 27 | 0 | 0 | 37 | 87 |
Nearby counties on file
- Webster County8/yr
- Scott County4/yr
- Palo Alto County4/yr
- Linn County3/yr
- Harrison County3/yr
- Clinton County3/yr
- Polk County2/yr
- Bremer County2/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.