Hartford, Connecticut Air Quality
Hartford County, Connecticut (CT)
↓ 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 | 43 | 64 | 166 | 226 | 132 | 7 | PM2.5 |
| 2022 | 42 | 61 | 136 | 260 | 101 | 4 | Ozone |
| 2021 | 42 | 63 | 136 | 247 | 115 | 3 | PM2.5 |
| 2020 | 42 | 60 | 98 | 255 | 111 | 0 | PM2.5 |
| 2019 | 43 | 59 | 122 | 252 | 108 | 5 | PM2.5 |
| 2018 | 42 | 64 | 143 | 240 | 123 | 2 | PM2.5 |
| 2017 | 46 | 64 | 133 | 219 | 143 | 3 | PM2.5 |
| 2016 | 47 | 68 | 169 | 207 | 152 | 7 | PM2.5 |
| 2015 | 52 | 75 | 147 | 167 | 190 | 8 | PM2.5 |
| 2014 | 52 | 71 | 143 | 159 | 196 | 10 | PM2.5 |
What This Means for Hartford County Residents
Hartford, Connecticut has received an Air Quality Grade of B (71/100) based on a decade of EPA monitoring data. The current median AQI of 43 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 9 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 4 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.