New Haven, Connecticut Air Quality
New Haven 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 | 47 | 74 | 208 | 205 | 148 | 12 | PM2.5 |
| 2022 | 44 | 69 | 133 | 230 | 128 | 7 | PM2.5 |
| 2021 | 46 | 69 | 159 | 220 | 131 | 14 | PM2.5 |
| 2020 | 46 | 77 | 174 | 210 | 143 | 13 | PM2.5 |
| 2019 | 44 | 70 | 159 | 228 | 123 | 14 | Ozone |
| 2018 | 44 | 71 | 156 | 220 | 131 | 14 | PM2.5 |
| 2017 | 44 | 64 | 179 | 241 | 112 | 12 | Ozone |
| 2016 | 47 | 74 | 164 | 211 | 141 | 14 | Ozone |
| 2015 | 52 | 77 | 169 | 161 | 188 | 16 | PM2.5 |
| 2014 | 51 | 76 | 126 | 174 | 183 | 8 | PM2.5 |
What This Means for New Haven County Residents
New Haven, Connecticut has received an Air Quality Grade of C (61/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 47 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 4 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 12 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity. The American Lung Association's State of the Air report provides additional context on long-term health risks from air pollution exposure.
Frequently Asked Questions
New Haven, Connecticut has a current median AQI of 47, which falls in the "Good" range. The area has received an Air Quality Grade of C (61/100) based on 10 years of EPA monitoring data.
Air quality in New Haven, Connecticut is improving over the past decade. The median AQI has changed by -4 points from 2014 to 2023.
New Haven, Connecticut averages 12 unhealthy air quality days per year over the past 5 years. On these days, sensitive groups including children, the elderly, and those with respiratory conditions should limit outdoor activity.
The primary pollutant affecting New Haven, Connecticut is Fine Particulate Matter (PM2.5). This is the dominant contributor to elevated AQI readings in the New Haven County area.
New Haven, Connecticut averages 12 unhealthy air days per year. Asthma patients should monitor daily AQI readings and limit outdoor activity when AQI exceeds 100. The primary pollutant is Fine Particulate Matter (PM2.5), which is a known asthma trigger.
With a median AQI of 47 (Good), outdoor exercise in New Haven, Connecticut is generally safe year-round. New Haven, Connecticut averages 12 days per year when athletes should move workouts indoors.