Bad Air Days in Harrison County, Ohio: 0 a Year
0 bad air days a year
Rare: among the cleanest-air counties EPA monitors. Ranked 976 of 996 monitored counties, where 1 is worst.
Is a purifier worth it here?
- 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 worst days on file
| Date | AQI | Main pollutant |
|---|---|---|
| 2022-06-16 | 71 | PM2.5 |
| 2021-09-25 | 68 | PM2.5 |
| 2021-02-21 | 66 | PM2.5 |
| 2021-07-21 | 66 | PM2.5 |
| 2018-12-10 | 65 | PM2.5 |
An ordinary day in Harrison
Across 1,016 monitored days from 2018 to 2022, the air in Harrison County rated Good on 94% of them, more often than the 72% typical of monitored counties, and Moderate on 6%. The median day sat at AQI 4; one day in ten went above 38.
The pollutant setting the AQI on an ordinary day here:
- carbon monoxide76%773 days
- fine particles (PM2.5)23%232 days
- coarse dust (PM10)1%11 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2022 | 42 | 34 | 8 | 0 | 0 | 33 | 71 |
| 2021 | 232 | 216 | 16 | 0 | 0 | 5 | 68 |
| 2020 | 304 | 295 | 9 | 0 | 0 | 1 | 56 |
| 2019 | 293 | 277 | 16 | 0 | 0 | 2 | 64 |
| 2018 | 145 | 134 | 11 | 0 | 0 | 3 | 65 |
Nearby counties on file
- Hamilton County9/yr
- Cuyahoga County7/yr
- Lucas County7/yr
- Lake County7/yr
- Butler County6/yr
- Warren County5/yr
- Geauga County5/yr
- Ashtabula County4/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.