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 38 counties in 2021, at 100%. Duval County had the lowest, at 38.4%. The median was 71.3%. Source: EPA.

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Highest100Putnam County
Lowest38.4Duval County
Median71.338 counties

Map of counties, 2021

Alachua County: 84.6 %Baker County: 75.3 %Bay County: 62.5 %Brevard County: 69.9 %Broward County: 52.3 %Citrus County: 65.6 %Collier County: 76.6 %Columbia County: 64.8 %Duval County: 38.4 %Escambia County: 54.8 %Flagler County: 97.5 %Hamilton County: 61.6 %Highlands County: 96.1 %Hillsborough County: 45.8 %Holmes County: 56.9 %Indian River County: 95.8 %Lake County: 94.9 %Lee County: 81.9 %Leon County: 53.2 %Liberty County: 98.4 %Manatee County: 97.3 %Marion County: 70.4 %Martin County: 68.8 %Miami-Dade County: 63 %Okaloosa County: 98.4 %Orange County: 97 %Osceola County: 95.5 %Palm Beach County: 72.1 %Pasco County: 94.8 %Pinellas County: 60.8 %Polk County: 63.6 %Putnam County: 100 %St. Lucie County: 97.2 %Santa Rosa County: 69.8 %Sarasota County: 66 %Seminole County: 74.8 %Volusia County: 61.4 %Wakulla County: 77.8 %
  • Under 61
  • 61 to 65
  • 65 to 71
  • 71 to 84
  • 84 to 97
  • 97 and over
  • No data
%, 2021. 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, 2021

Putnam County: 100 %Putnam County100Liberty County: 98.4 %Liberty County98.4Okaloosa County: 98.4 %Okaloosa County98.4Flagler County: 97.5 %Flagler County97.5Manatee County: 97.3 %Manatee County97.3St. Lucie County: 97.2 %St. Lucie County97.2Orange County: 97 %Orange County97Highlands County: 96.1 %Highlands County96.1Indian River County: 95.8 %Indian River County95.8Osceola County: 95.5 %Osceola County95.5Lake County: 94.9 %Lake County94.9Pasco County: 94.8 %Pasco County94.8Alachua County: 84.6 %Alachua County84.6Lee County: 81.9 %Lee County81.9Wakulla County: 77.8 %Wakulla County77.8Collier County: 76.6 %Collier County76.6Baker County: 75.3 %Baker County75.3Seminole County: 74.8 %Seminole County74.8Palm Beach County: 72.1 %Palm Beach County72.1Marion County: 70.4 %Marion County70.4Brevard County: 69.9 %Brevard County69.9Santa Rosa County: 69.8 %Santa Rosa County69.8Martin County: 68.8 %Martin County68.8Sarasota County: 66 %Sarasota County66Citrus County: 65.6 %Citrus County65.6Columbia County: 64.8 %Columbia County64.8Polk County: 63.6 %Polk County63.6Miami-Dade County: 63 %Miami-Dade County63Bay County: 62.5 %Bay County62.5Hamilton County: 61.6 %Hamilton County61.6Volusia County: 61.4 %Volusia County61.4Pinellas County: 60.8 %Pinellas County60.8Holmes County: 56.9 %Holmes County56.9Escambia County: 54.8 %Escambia County54.8Leon County: 53.2 %Leon County53.2Broward County: 52.3 %Broward County52.3Hillsborough County: 45.8 %Hillsborough County45.8Duval County: 38.4 %Duval County38.4Putnam County: 100 %Putnam County100Liberty County: 98.4 %Liberty County98.4Okaloosa County: 98.4 %Okaloosa County98.4Flagler County: 97.5 %Flagler County97.5Manatee County: 97.3 %Manatee County97.3St. Lucie County: 97.2 %St. Lucie County97.2Orange County: 97 %Orange County97Highlands County: 96.1 %Highlands County96.1Indian River County: 95.8 %Indian River County95.8Osceola County: 95.5 %Osceola County95.5Lake County: 94.9 %Lake County94.9Pasco County: 94.8 %Pasco County94.8Alachua County: 84.6 %Alachua County84.6Lee County: 81.9 %Lee County81.9Wakulla County: 77.8 %Wakulla County77.8Collier County: 76.6 %Collier County76.6Baker County: 75.3 %Baker County75.3Seminole County: 74.8 %Seminole County74.8Palm Beach County: 72.1 %Palm Beach County72.1Marion County: 70.4 %Marion County70.4Brevard County: 69.9 %Brevard County69.9Santa Rosa County: 69.8 %Santa Rosa County69.8Martin County: 68.8 %Martin County68.8Sarasota County: 66 %Sarasota County66Citrus County: 65.6 %Citrus County65.6Columbia County: 64.8 %Columbia County64.8Polk County: 63.6 %Polk County63.6Miami-Dade County: 63 %Miami-Dade County63Bay County: 62.5 %Bay County62.5Hamilton County: 61.6 %Hamilton County61.6Volusia County: 61.4 %Volusia County61.4Pinellas County: 60.8 %Pinellas County60.8Holmes County: 56.9 %Holmes County56.9Escambia County: 54.8 %Escambia County54.8Leon County: 53.2 %Leon County53.2Broward County: 52.3 %Broward County52.3Hillsborough County: 45.8 %Hillsborough County45.8Duval County: 38.4 %Duval County38.4
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Putnam County100+0.3 pts
2Liberty County98.4-1 pts
2Okaloosa County98.4+0.9 pts
4Flagler County97.5-1.7 pts
5Manatee County97.3+0.3 pts
6St. Lucie County97.2-0.3 pts
7Orange County97+0.3 pts
8Highlands County96.1-0.3 pts
9Indian River County95.8+0.2 pts
10Osceola County95.5-1.2 pts
11Lake County94.9-1.8 pts
12Pasco County94.8-2.2 pts
13Alachua County84.6+9.7 pts
14Lee County81.9+4.3 pts
15Wakulla County77.8+4.8 pts
16Collier County76.6+3.2 pts
17Baker County75.3-2.7 pts
18Seminole County74.8-3.8 pts
19Palm Beach County72.1-1.9 pts
20Marion County70.4+7.8 pts
21Brevard County69.9-2.5 pts
22Santa Rosa County69.8+8.7 pts
23Martin County68.8-6.5 pts
24Sarasota County66-0.7 pts
25Citrus County65.6-1.5 pts
26Columbia County64.8+1.5 pts
27Polk County63.6-5.4 pts
28Miami-Dade County63+1.3 pts
29Bay County62.5+4.6 pts
30Hamilton County61.6-2.2 pts
31Volusia County61.4-8.2 pts
32Pinellas County60.8-0.9 pts
33Holmes County56.9-4 pts
34Escambia County54.8+5.9 pts
35Leon County53.2+2.7 pts
36Broward County52.3-0.2 pts
37Hillsborough County45.8-2.3 pts
38Duval County38.4-5.9 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. 4 counties with data in other periods have no value for 2021 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), 2021) [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), 2021. 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=2021. 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), 2021. 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=2021.

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), 2021 [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=2021 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_florida_by_2021,
  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), 2021}},
  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=2021. 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), 2021
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=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2021.
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 100% in 2021, according to EPA.

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

Duval County, with 38.4% in 2021.

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. 4 counties have no value for 2021 and are not ranked.

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

Counties in Florida: more rankings