# Anderson County, Tennessee annual air quality

In the 2025 EPA annual record, Anderson County had a median AQI of 39 (Good) and 94.3% of 244 monitored days were rated Good.

## Key figures

- Monitored days: 244
- Good days: 230 (94.3%)
- Moderate days: 13
- Unhealthy for Sensitive Groups days: 1
- Unhealthy-or-worse days: 0
- Median AQI: 39 (Good)
- 90th-percentile AQI: 48
- Maximum AQI: 105 (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 35; 97.1% Good (238 of 245 monitored days).
- 2021: median AQI 38; 93.2% Good (219 of 235 monitored days).
- 2022: median AQI 39; 93.1% Good (228 of 245 monitored days).
- 2023: median AQI 41; 89.5% Good (212 of 237 monitored days).
- 2024: median AQI 41; 90.9% Good (221 of 243 monitored days).
- 2025: median AQI 39; 94.3% Good (230 of 244 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/tennessee-anderson
- County CSV row: https://plainairdata.com/county/tennessee-anderson.csv
- State overview: https://plainairdata.com/state/tennessee