Macoupin, Illinois Air Quality
Macoupin County, Illinois (IL)
↓ 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 | 37 | 61 | 129 | 310 | 45 | 10 | Ozone |
| 2022 | 33 | 45 | 108 | 352 | 9 | 2 | Ozone |
| 2021 | 31 | 48 | 93 | 339 | 19 | 0 | Ozone |
| 2020 | 31 | 45 | 93 | 346 | 18 | 0 | Ozone |
| 2019 | 33 | 47 | 87 | 340 | 17 | 0 | Ozone |
| 2018 | 36 | 50 | 115 | 300 | 30 | 3 | Ozone |
| 2017 | 40 | 51 | 93 | 218 | 26 | 0 | Ozone |
| 2016 | 39 | 51 | 97 | 182 | 21 | 0 | Ozone |
| 2015 | 38 | 49 | 90 | 195 | 18 | 0 | Ozone |
| 2014 | 38 | 51 | 93 | 192 | 22 | 0 | Ozone |
What This Means for Macoupin County Residents
Macoupin, Illinois has received an Air Quality Grade of B (73/100) based on a decade of EPA monitoring data. The current median AQI of 37 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 1 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 2 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.