Knox, Maine Air Quality
Knox County, Maine (ME)
→ 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 | 33 | 44 | 87 | 296 | 5 | 0 | Ozone |
| 2022 | 35 | 45 | 80 | 206 | 6 | 0 | Ozone |
| 2021 | 35 | 50 | 119 | 192 | 17 | 2 | Ozone |
| 2020 | 31 | 45 | 71 | 142 | 6 | 0 | Ozone |
| 2019 | 36 | 47 | 84 | 204 | 9 | 0 | Ozone |
| 2018 | 36 | 45 | 112 | 209 | 9 | 1 | Ozone |
| 2017 | 35 | 45 | 143 | 205 | 7 | 3 | Ozone |
| 2016 | 33 | 48 | 122 | 171 | 9 | 1 | Ozone |
| 2015 | 36 | 50 | 119 | 164 | 13 | 1 | Ozone |
| 2014 | 34 | 47 | 87 | 194 | 11 | 0 | Ozone |
What This Means for Knox County Residents
Knox, Maine has received an Air Quality Grade of B (69/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 33 falls in the "Good" range.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 0 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.
Related Cities in Maine
Frequently Asked Questions
Knox, Maine has a current median AQI of 33, which falls in the "Good" range. The area has received an Air Quality Grade of B (69/100) based on 10 years of EPA monitoring data.
Air quality in Knox, Maine is stable over the past decade. The median AQI has changed by -1 points from 2014 to 2023.
Knox, Maine averages 0 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 Knox, Maine is Ground-Level Ozone. This is the dominant contributor to elevated AQI readings in the Knox County area.
Knox, Maine averages 0 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 33 (Good), outdoor exercise in Knox, Maine is generally safe year-round. Knox, Maine averages 0 days per year when athletes should move workouts indoors.