Hamilton, Ohio Air Quality
Hamilton County, Ohio (OH)
↓ 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 | 54 | 77 | 193 | 129 | 217 | 19 | PM2.5 |
| 2022 | 54 | 71 | 151 | 125 | 236 | 4 | PM2.5 |
| 2021 | 56 | 77 | 140 | 109 | 251 | 5 | PM2.5 |
| 2020 | 55 | 71 | 126 | 105 | 254 | 7 | PM2.5 |
| 2019 | 57 | 77 | 119 | 99 | 260 | 6 | PM2.5 |
| 2018 | 57 | 76 | 159 | 97 | 260 | 8 | PM2.5 |
| 2017 | 55 | 72 | 129 | 118 | 242 | 5 | PM2.5 |
| 2016 | 55 | 77 | 140 | 118 | 236 | 12 | PM2.5 |
| 2015 | 55 | 77 | 151 | 119 | 240 | 6 | PM2.5 |
| 2014 | 61 | 80 | 143 | 62 | 292 | 11 | PM2.5 |
What This Means for Hamilton County Residents
Hamilton, Ohio has received an Air Quality Grade of C (57/100) based on a decade of EPA monitoring data. The current median AQI of 54 falls in the "Moderate" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 7 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 8 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.