Bad Air Days in Perry County, Kentucky: 1 a Year
1 bad air day a year
Fewer bad air days than most monitored US counties. Ranked 652 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly particles: smoke and dust (100% particle days).
The bad-air season here
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in November and June and March. Averaged over 2016 to 2025.
What actually helps 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
In 2000 to 2009 this county averaged 10 bad days a year; in 2016 to 2025, 1. The air has improved. The worst recent year was 2023, with 4 bad days on 365 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2025-03-12 | 172 | PM2.5 |
| 2022-02-02 | 171 | PM2.5 |
| 2016-11-08 | 168 | PM2.5 |
| 2022-11-10 | 166 | PM2.5 |
| 2023-06-29 | 137 | PM2.5 |
The air on a normal day
Across 3,580 monitored days from 2016 to 2025, the air in Perry County rated Good on 67% of them, less often than the 72% typical of monitored counties, and Moderate on 33%. The median day sat at AQI 44; one day in ten went above 58.
The pollutant setting the AQI on an ordinary day here:
- fine particles (PM2.5)75%2,684 days
- ozone25%896 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 365 | 318 | 46 | 1 | 1 | 36 | 172 |
| 2024 | 352 | 290 | 61 | 1 | 0 | 40 | 117 |
| 2023 | 365 | 223 | 138 | 4 | 0 | 45 | 137 |
| 2022 | 348 | 226 | 119 | 3 | 2 | 46 | 171 |
| 2021 | 365 | 247 | 118 | 0 | 0 | 44 | 93 |
| 2020 | 364 | 278 | 86 | 0 | 0 | 39 | 99 |
| 2019 | 353 | 238 | 115 | 0 | 0 | 44 | 87 |
| 2018 | 364 | 205 | 159 | 0 | 0 | 48 | 80 |
| 2017 | 352 | 209 | 143 | 0 | 0 | 47 | 84 |
| 2016 | 352 | 165 | 185 | 2 | 1 | 51 | 168 |
| 2015 | 361 | 256 | 105 | 0 | 0 | 43 | 84 |
| 2014 | 350 | 202 | 148 | 0 | 0 | 47 | 84 |
| 2013 | 361 | 253 | 108 | 0 | 0 | 42 | 77 |
| 2012 | 361 | 128 | 230 | 3 | 0 | 54 | 126 |
| 2011 | 361 | 234 | 127 | 0 | 0 | 44 | 87 |
| 2010 | 357 | 214 | 139 | 4 | 0 | 46 | 115 |
*2025 may be a partial year in EPA's file.
Nearby counties on file
- Jefferson County9/yr
- Oldham County3/yr
- Henderson County2/yr
- Campbell County2/yr
- Boone County2/yr
- Bullitt County2/yr
- McCracken County2/yr
- Daviess 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.