# Counties in Vermont by share of days with good air quality (US EPA AQI), 2006

All 5 values come from U.S. Environmental Protection Agency for 2006, so the places are comparable. 2 counties have no value for that period and are not ranked.

- Indicator id: `aqi_good_days_share`
- Unit: %
- Definition: Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual)
- Retrieved: 2026-10-12
- Citation: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/good-air-quality-days-share/vermont-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Windham County | 100 |
| 2 | Rutland County | 85.5 |
| 3 | Bennington County | 85.4 |
| 4 | Chittenden County | 84.1 |
| 5 | Addison County | 68.7 |