Hardin, Kentucky Air Quality
Hardin County, Kentucky (KY)
↓ Improvingover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). This area has seen measurable air quality improvement over the decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 45 | 66 | 151 | 225 | 136 | 4 | PM2.5 |
| 2022 | 44 | 58 | 86 | 242 | 120 | 0 | PM2.5 |
| 2021 | 43 | 62 | 101 | 238 | 125 | 1 | PM2.5 |
| 2020 | 43 | 56 | 80 | 268 | 98 | 0 | PM2.5 |
| 2019 | 44 | 57 | 72 | 261 | 102 | 0 | PM2.5 |
| 2018 | 49 | 64 | 100 | 191 | 170 | 0 | PM2.5 |
| 2017 | 51 | 62 | 87 | 178 | 187 | 0 | PM2.5 |
| 2016 | 52 | 66 | 101 | 152 | 211 | 1 | PM2.5 |
| 2015 | 51 | 66 | 105 | 175 | 189 | 1 | PM2.5 |
| 2014 | 50 | 65 | 88 | 172 | 169 | 0 | PM2.5 |
What This Means for Hardin County Residents
Hardin, Kentucky has received an Air Quality Grade of B (71/100) based on a decade of EPA monitoring data. The current median AQI of 45 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 5 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 1 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.