Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in Florida

Counties in Florida by share of days with good air quality (US EPA AQI)

Putnam County had the highest share of days with good air quality (US EPA AQI) of 39 counties in 2020, at 99.7%. Duval County had the lowest, at 44.3%. The median was 73.4%. Source: EPA.

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Highest99.7Putnam County
Lowest44.3Duval County
Median73.439 counties

Map of counties, 2020

Alachua County: 74.9 %Baker County: 78 %Bay County: 57.9 %Brevard County: 72.4 %Broward County: 52.5 %Citrus County: 67.1 %Collier County: 73.4 %Columbia County: 63.3 %Duval County: 44.3 %Escambia County: 48.9 %Flagler County: 99.2 %Hamilton County: 63.8 %Highlands County: 96.4 %Hillsborough County: 48.1 %Holmes County: 60.9 %Indian River County: 95.6 %Lake County: 96.7 %Lee County: 77.6 %Leon County: 50.5 %Liberty County: 99.4 %Manatee County: 97 %Marion County: 62.6 %Martin County: 75.3 %Miami-Dade County: 61.7 %Nassau County: 81.4 %Okaloosa County: 97.5 %Orange County: 96.7 %Osceola County: 96.7 %Palm Beach County: 74 %Pasco County: 97 %Pinellas County: 61.7 %Polk County: 69 %Putnam County: 99.7 %St. Lucie County: 97.5 %Santa Rosa County: 61.1 %Sarasota County: 66.7 %Seminole County: 78.6 %Volusia County: 69.6 %Wakulla County: 73 %
  • Under 61
  • 61 to 66
  • 66 to 73
  • 73 to 80
  • 80 to 97
  • 97 and over
  • No data
%, 2020. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2020

Putnam County: 99.7 %Putnam County99.7Liberty County: 99.4 %Liberty County99.4Flagler County: 99.2 %Flagler County99.2Okaloosa County: 97.5 %Okaloosa County97.5St. Lucie County: 97.5 %St. Lucie County97.5Manatee County: 97 %Manatee County97Pasco County: 97 %Pasco County97Lake County: 96.7 %Lake County96.7Orange County: 96.7 %Orange County96.7Osceola County: 96.7 %Osceola County96.7Highlands County: 96.4 %Highlands County96.4Indian River County: 95.6 %Indian River County95.6Nassau County: 81.4 %Nassau County81.4Seminole County: 78.6 %Seminole County78.6Baker County: 78 %Baker County78Lee County: 77.6 %Lee County77.6Martin County: 75.3 %Martin County75.3Alachua County: 74.9 %Alachua County74.9Palm Beach County: 74 %Palm Beach County74Collier County: 73.4 %Collier County73.4Wakulla County: 73 %Wakulla County73Brevard County: 72.4 %Brevard County72.4Volusia County: 69.6 %Volusia County69.6Polk County: 69 %Polk County69Citrus County: 67.1 %Citrus County67.1Sarasota County: 66.7 %Sarasota County66.7Hamilton County: 63.8 %Hamilton County63.8Columbia County: 63.3 %Columbia County63.3Marion County: 62.6 %Marion County62.6Miami-Dade County: 61.7 %Miami-Dade County61.7Pinellas County: 61.7 %Pinellas County61.7Santa Rosa County: 61.1 %Santa Rosa County61.1Holmes County: 60.9 %Holmes County60.9Bay County: 57.9 %Bay County57.9Broward County: 52.5 %Broward County52.5Leon County: 50.5 %Leon County50.5Escambia County: 48.9 %Escambia County48.9Hillsborough County: 48.1 %Hillsborough County48.1Duval County: 44.3 %Duval County44.3Putnam County: 99.7 %Putnam County99.7Liberty County: 99.4 %Liberty County99.4Flagler County: 99.2 %Flagler County99.2Okaloosa County: 97.5 %Okaloosa County97.5St. Lucie County: 97.5 %St. Lucie County97.5Manatee County: 97 %Manatee County97Pasco County: 97 %Pasco County97Lake County: 96.7 %Lake County96.7Orange County: 96.7 %Orange County96.7Osceola County: 96.7 %Osceola County96.7Highlands County: 96.4 %Highlands County96.4Indian River County: 95.6 %Indian River County95.6Nassau County: 81.4 %Nassau County81.4Seminole County: 78.6 %Seminole County78.6Baker County: 78 %Baker County78Lee County: 77.6 %Lee County77.6Martin County: 75.3 %Martin County75.3Alachua County: 74.9 %Alachua County74.9Palm Beach County: 74 %Palm Beach County74Collier County: 73.4 %Collier County73.4Wakulla County: 73 %Wakulla County73Brevard County: 72.4 %Brevard County72.4Volusia County: 69.6 %Volusia County69.6Polk County: 69 %Polk County69Citrus County: 67.1 %Citrus County67.1Sarasota County: 66.7 %Sarasota County66.7Hamilton County: 63.8 %Hamilton County63.8Columbia County: 63.3 %Columbia County63.3Marion County: 62.6 %Marion County62.6Miami-Dade County: 61.7 %Miami-Dade County61.7Pinellas County: 61.7 %Pinellas County61.7Santa Rosa County: 61.1 %Santa Rosa County61.1Holmes County: 60.9 %Holmes County60.9Bay County: 57.9 %Bay County57.9Broward County: 52.5 %Broward County52.5Leon County: 50.5 %Leon County50.5Escambia County: 48.9 %Escambia County48.9Hillsborough County: 48.1 %Hillsborough County48.1Duval County: 44.3 %Duval County44.3
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Putnam County99.7+1.1 pts
2Liberty County99.4+2.8 pts
3Flagler County99.2+1.1 pts
4Okaloosa County97.5+5.2 pts
4St. Lucie County97.5+0.3 pts
6Manatee County97+5.8 pts
6Pasco County97+4.9 pts
8Lake County96.7+5.5 pts
8Orange County96.7+15.3 pts
8Osceola County96.7+3.8 pts
11Highlands County96.4+0.3 pts
12Indian River County95.6-1.1 pts
13Nassau County81.4+6.2 pts
14Seminole County78.6-2.5 pts
15Baker County78-16.5 pts
16Lee County77.6-1.6 pts
17Martin County75.3-6.5 pts
18Alachua County74.9-4.5 pts
19Palm Beach County74-2.5 pts
20Collier County73.4-7 pts
21Wakulla County73-3.2 pts
22Brevard County72.4-15.3 pts
23Volusia County69.6-8.7 pts
24Polk County69-4.4 pts
25Citrus County67.1-4.9 pts
26Sarasota County66.7-6.7 pts
27Hamilton County63.8-3.9 pts
28Columbia County63.3+0.2 pts
29Marion County62.6-4.2 pts
30Miami-Dade County61.7-5.8 pts
30Pinellas County61.7+0.6 pts
32Santa Rosa County61.1-1.8 pts
33Holmes County60.9+3.7 pts
34Bay County57.9-9.3 pts
35Broward County52.5-6.2 pts
36Leon County50.5-9.2 pts
37Escambia County48.9-19 pts
38Hillsborough County48.1-7.2 pts
39Duval County44.3-1.1 pts

Other periods

About this ranking

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.

United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 3 counties with data in other periods have no value for 2020 and are left out rather than filled from another source. Equal values share a rank.

How to cite

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.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (Counties in Florida by share of days with good air quality (US EPA AQI), 2020) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in Florida by share of days with good air quality (US EPA AQI), 2020. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2020. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Counties in Florida by share of days with good air quality (US EPA AQI), 2020. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2020.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in Florida by share of days with good air quality (US EPA AQI), 2020 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2020 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_florida_by_2020,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in Florida by share of days with good air quality (US EPA AQI), 2020}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2020. Publisher attribution: 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.},
}
RIS
TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in Florida by share of days with good air quality (US EPA AQI), 2020
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2020.
N1  - Publisher attribution: 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.
ER  -
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Questions

Which county has the highest share of days with good air quality (US EPA AQI)?

Putnam County, with 99.7% in 2020, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

Duval County, with 44.3% in 2020.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: 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. Retrieved 2026-10-12. 3 counties have no value for 2020 and are not ranked.

Share of days with good air quality (US EPA AQI): other rankings

Counties in Florida: more rankings