Chittenden, Vermont Air Quality
Chittenden County, Vermont (VT)
→ Stableover 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).
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 | 42 | 59 | 160 | 259 | 100 | 6 | Ozone |
| 2022 | 41 | 53 | 90 | 298 | 67 | 0 | Ozone |
| 2021 | 40 | 57 | 129 | 288 | 76 | 1 | PM2.5 |
| 2020 | 39 | 53 | 98 | 302 | 64 | 0 | Ozone |
| 2019 | 39 | 54 | 82 | 306 | 59 | 0 | Ozone |
| 2018 | 40 | 56 | 90 | 295 | 70 | 0 | Ozone |
| 2017 | 37 | 52 | 74 | 312 | 53 | 0 | Ozone |
| 2016 | 36 | 52 | 80 | 319 | 47 | 0 | Ozone |
| 2015 | 39 | 59 | 100 | 278 | 87 | 0 | Ozone |
| 2014 | 41 | 58 | 85 | 288 | 77 | 0 | Ozone |
What This Means for Chittenden County Residents
Chittenden, Vermont has received an Air Quality Grade of C (63/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 42 falls in the "Good" range.
The primary pollutant affecting this area is Ground-Level Ozone. 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. 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
Chittenden, Vermont has a current median AQI of 42, which falls in the "Good" range. The area has received an Air Quality Grade of C (63/100) based on 10 years of EPA monitoring data.
Air quality in Chittenden, Vermont is stable over the past decade. The median AQI has changed by +1 points from 2014 to 2023.
Chittenden, Vermont averages 1 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 Chittenden, Vermont is Ground-Level Ozone. This is the dominant contributor to elevated AQI readings in the Chittenden County area.
Chittenden, Vermont averages 1 unhealthy air days per year. This is relatively low, making it a reasonable choice for asthma sufferers. The primary pollutant is Ground-Level Ozone, which is a known asthma trigger.
With a median AQI of 42 (Good), outdoor exercise in Chittenden, Vermont is generally safe year-round. Chittenden, Vermont averages 1 days per year when athletes should move workouts indoors.