# Berrien County, Michigan annual air quality

In the 2025 EPA annual record, Berrien County had a median AQI of 41 (Good) and 80.9% of 262 monitored days were rated Good.

## Key figures

- Monitored days: 262
- Good days: 212 (80.9%)
- Moderate days: 47
- Unhealthy for Sensitive Groups days: 3
- Unhealthy-or-worse days: 0
- Median AQI: 41 (Good)
- 90th-percentile AQI: 67
- Maximum AQI: 147 (USG)
- Main pollutant-day driver: ozone

The Good-day percentage uses monitored days as its denominator; unmonitored calendar days are not estimated. This record clears the 100-day comparison floor.

## Annual history

- 2020: median AQI 38; 84.1% Good (217 of 258 monitored days).
- 2021: median AQI 40; 83.6% Good (209 of 250 monitored days).
- 2022: median AQI 39; 84.9% Good (197 of 232 monitored days).
- 2023: median AQI 42; 74.2% Good (181 of 244 monitored days).
- 2024: median AQI 41; 83.0% Good (200 of 241 monitored days).
- 2025: median AQI 41; 80.9% Good (212 of 262 monitored days).

## Source and scope

- Source: U.S. EPA Air Quality System annual summary for 2025: https://aqs.epa.gov/aqsweb/airdata/download_files.html
- PlainAirData data refresh: 2026-08-23
- Scope: annual monitor records, not current conditions or an air-quality forecast.
- Methodology: https://plainairdata.com/methodology

## Related resources

- Full HTML page: https://plainairdata.com/county/michigan-berrien
- County CSV row: https://plainairdata.com/county/michigan-berrien.csv
- State overview: https://plainairdata.com/state/michigan