# Counties in Michigan by share of days with good air quality (US EPA AQI), 2007

All 30 values come from U.S. Environmental Protection Agency for 2007, so the places are comparable. 23 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/michigan-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Presque Isle County | 98.3 |
| 2 | Keweenaw County | 90 |
| 3 | Wexford County | 86 |
| 4 | Tuscola County | 84 |
| 5 | Schoolcraft County | 79.8 |
| 6 | Clinton County | 75.7 |
| 7 | Huron County | 74.2 |
| 8 | Leelanau County | 73.3 |
| 9 | Benzie County | 72.7 |
| 10 | Mason County | 72.1 |
| 11 | Missaukee County | 70.7 |
| 12 | Manistee County | 67.4 |
| 13 | Washtenaw County | 66.8 |
| 14 | Macomb County | 65.6 |
| 15 | Lenawee County | 65.5 |
| 16 | Oakland County | 63.4 |
| 17 | Kent County | 61 |
| 18 | Cass County | 59.6 |
| 19 | St. Clair County | 59.3 |
| 20 | Genesee County | 56.7 |
| 21 | Allegan County | 55.6 |
| 22 | Ingham County | 53.8 |
| 23 | Kalamazoo County | 50.6 |
| 23 | Muskegon County | 50.6 |
| 25 | Berrien County | 50.2 |
| 26 | Bay County | 49.1 |
| 27 | Ottawa County | 42.5 |
| 28 | Chippewa County | 40.2 |
| 29 | Monroe County | 31.4 |
| 30 | Wayne County | 25.2 |