Bad Air Days in Story County, Iowa: 0 a Year
0 bad air days a year
Rare: among the cleanest-air counties EPA monitors. Ranked 963 of 996 monitored counties, where 1 is worst.
What to buy, and what not to
- Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
- On the odd bad day, check AirNow and keep windows shut.
The record for Story
In 2000 to 2009 this county averaged 1 bad days a year; in 2016 to 2025, 0. Not much has changed.
| Date | AQI | Main pollutant |
|---|---|---|
| 2016-05-21 | 77 | Ozone |
| 2016-06-18 | 77 | Ozone |
| 2016-06-21 | 74 | Ozone |
| 2016-05-20 | 67 | Ozone |
| 2016-05-22 | 67 | Ozone |
An ordinary day in Story
Across 212 monitored days from 2016 to 2016, the air in Story 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 48.
The pollutant setting the AQI on an ordinary day here:
- ozone100%212 days
Story County by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2016 | 212 | 198 | 14 | 0 | 0 | 35 | 77 |
| 2015 | 213 | 202 | 11 | 0 | 0 | 36 | 77 |
| 2014 | 214 | 190 | 24 | 0 | 0 | 37 | 90 |
| 2013 | 214 | 196 | 18 | 0 | 0 | 41 | 80 |
| 2012 | 214 | 175 | 39 | 0 | 0 | 43 | 87 |
| 2011 | 214 | 198 | 16 | 0 | 0 | 36 | 87 |
| 2010 | 214 | 200 | 14 | 0 | 0 | 36 | 90 |
Iowa compared
- 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.