# Counties in Florida by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2025

All 38 values come from U.S. Environmental Protection Agency for 2025, so the places are comparable. 4 counties have no value for that period and are not ranked.

- Indicator id: `aqi_unhealthy_sensitive_or_worse_days_share`
- Unit: %
- Definition: Days with a daily Air Quality Index above 100 (unhealthy for sensitive groups, unhealthy, very unhealthy or hazardous) 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; the counts are stored with each value.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: days with an AQI above 100 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: days with an AQI above 100 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/unhealthy-air-quality-days-share/florida-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Duval County | 1.1 |
| 2 | Baker County | 0.5 |
| 2 | Hillsborough County | 0.5 |
| 4 | Citrus County | 0.3 |
| 4 | Escambia County | 0.3 |
| 4 | Lake County | 0.3 |
| 4 | Leon County | 0.3 |
| 4 | Marion County | 0.3 |
| 4 | Miami-Dade County | 0.3 |
| 4 | Orange County | 0.3 |
| 4 | Osceola County | 0.3 |
| 4 | Pasco County | 0.3 |
| 4 | Pinellas County | 0.3 |
| 14 | Alachua County | 0 |
| 14 | Bay County | 0 |
| 14 | Brevard County | 0 |
| 14 | Broward County | 0 |
| 14 | Collier County | 0 |
| 14 | Columbia County | 0 |
| 14 | Flagler County | 0 |
| 14 | Hamilton County | 0 |
| 14 | Highlands County | 0 |
| 14 | Holmes County | 0 |
| 14 | Indian River County | 0 |
| 14 | Lee County | 0 |
| 14 | Liberty County | 0 |
| 14 | Manatee County | 0 |
| 14 | Martin County | 0 |
| 14 | Okaloosa County | 0 |
| 14 | Palm Beach County | 0 |
| 14 | Polk County | 0 |
| 14 | Putnam County | 0 |
| 14 | Santa Rosa County | 0 |
| 14 | Sarasota County | 0 |
| 14 | Seminole County | 0 |
| 14 | St. Lucie County | 0 |
| 14 | Volusia County | 0 |
| 14 | Wakulla County | 0 |