# Counties in Louisiana by share of days with good air quality (US EPA AQI), 2005

All 28 values come from U.S. Environmental Protection Agency for 2005, 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/louisiana-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Beauregard Parish | 82.1 |
| 2 | Grant Parish | 80.3 |
| 3 | St. John the Baptist Parish | 76.8 |
| 4 | St. James Parish | 76.2 |
| 5 | St. Mary Parish | 75.4 |
| 6 | St. Charles Parish | 75.1 |
| 7 | Ascension Parish | 74.2 |
| 8 | Pointe Coupee Parish | 69.7 |
| 9 | Ouachita Parish | 56.9 |
| 10 | Lafayette Parish | 56.2 |
| 11 | Caddo Parish | 56 |
| 12 | St. Bernard Parish | 55.1 |
| 13 | Iberville Parish | 51 |
| 14 | Winn Parish | 47.5 |
| 15 | Terrebonne Parish | 47.1 |
| 16 | Plaquemines Parish | 43.6 |
| 17 | Rapides Parish | 39.3 |
| 18 | Livingston Parish | 38.5 |
| 19 | Bossier Parish | 38.2 |
| 20 | Lafourche Parish | 36.9 |
| 21 | Tangipahoa Parish | 33.6 |
| 22 | Orleans Parish | 31.8 |
| 23 | Calcasieu Parish | 31 |
| 24 | Concordia Parish | 28.8 |
| 25 | Jefferson Parish | 25.5 |
| 26 | West Baton Rouge Parish | 18.9 |
| 27 | St. Tammany Parish | 17.9 |
| 28 | East Baton Rouge Parish | 17.8 |