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 2023, at 99.7%. Hillsborough County had the lowest, at 42.7%. The median was 72.6%. Source: EPA.

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Highest99.7Putnam County
Lowest42.7Hillsborough County
Median72.638 counties

Map of counties, 2023

Alachua County: 74 %Baker County: 68.1 %Bay County: 48.2 %Brevard County: 76.4 %Broward County: 43.3 %Citrus County: 65.2 %Collier County: 71.9 %Columbia County: 58.4 %Duval County: 42.7 %Escambia County: 48.8 %Flagler County: 97.3 %Hamilton County: 60.1 %Highlands County: 95.8 %Hillsborough County: 42.7 %Holmes County: 51.8 %Indian River County: 97.8 %Lake County: 92.6 %Lee County: 94.5 %Leon County: 56.5 %Liberty County: 98 %Manatee County: 93.4 %Marion County: 66 %Martin County: 77.5 %Miami-Dade County: 56.7 %Okaloosa County: 90.5 %Orange County: 73.2 %Osceola County: 92.7 %Palm Beach County: 71.2 %Pasco County: 88.5 %Pinellas County: 59.5 %Polk County: 75.3 %Putnam County: 99.7 %St. Lucie County: 97.5 %Santa Rosa County: 56.7 %Sarasota County: 63.6 %Seminole County: 82.1 %Volusia County: 71.8 %Wakulla County: 74.5 %
  • Under 57
  • 57 to 64
  • 64 to 73
  • 73 to 81
  • 81 to 94
  • 94 and over
  • No data
%, 2023. 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, 2023

Putnam County: 99.7 %Putnam County99.7Liberty County: 98 %Liberty County98Indian River County: 97.8 %Indian River County97.8St. Lucie County: 97.5 %St. Lucie County97.5Flagler County: 97.3 %Flagler County97.3Highlands County: 95.8 %Highlands County95.8Lee County: 94.5 %Lee County94.5Manatee County: 93.4 %Manatee County93.4Osceola County: 92.7 %Osceola County92.7Lake County: 92.6 %Lake County92.6Okaloosa County: 90.5 %Okaloosa County90.5Pasco County: 88.5 %Pasco County88.5Seminole County: 82.1 %Seminole County82.1Martin County: 77.5 %Martin County77.5Brevard County: 76.4 %Brevard County76.4Polk County: 75.3 %Polk County75.3Wakulla County: 74.5 %Wakulla County74.5Alachua County: 74 %Alachua County74Orange County: 73.2 %Orange County73.2Collier County: 71.9 %Collier County71.9Volusia County: 71.8 %Volusia County71.8Palm Beach County: 71.2 %Palm Beach County71.2Baker County: 68.1 %Baker County68.1Marion County: 66 %Marion County66Citrus County: 65.2 %Citrus County65.2Sarasota County: 63.6 %Sarasota County63.6Hamilton County: 60.1 %Hamilton County60.1Pinellas County: 59.5 %Pinellas County59.5Columbia County: 58.4 %Columbia County58.4Miami-Dade County: 56.7 %Miami-Dade County56.7Santa Rosa County: 56.7 %Santa Rosa County56.7Leon County: 56.5 %Leon County56.5Holmes County: 51.8 %Holmes County51.8Escambia County: 48.8 %Escambia County48.8Bay County: 48.2 %Bay County48.2Broward County: 43.3 %Broward County43.3Duval County: 42.7 %Duval County42.7Hillsborough County: 42.7 %Hillsborough County42.7Putnam County: 99.7 %Putnam County99.7Liberty County: 98 %Liberty County98Indian River County: 97.8 %Indian River County97.8St. Lucie County: 97.5 %St. Lucie County97.5Flagler County: 97.3 %Flagler County97.3Highlands County: 95.8 %Highlands County95.8Lee County: 94.5 %Lee County94.5Manatee County: 93.4 %Manatee County93.4Osceola County: 92.7 %Osceola County92.7Lake County: 92.6 %Lake County92.6Okaloosa County: 90.5 %Okaloosa County90.5Pasco County: 88.5 %Pasco County88.5Seminole County: 82.1 %Seminole County82.1Martin County: 77.5 %Martin County77.5Brevard County: 76.4 %Brevard County76.4Polk County: 75.3 %Polk County75.3Wakulla County: 74.5 %Wakulla County74.5Alachua County: 74 %Alachua County74Orange County: 73.2 %Orange County73.2Collier County: 71.9 %Collier County71.9Volusia County: 71.8 %Volusia County71.8Palm Beach County: 71.2 %Palm Beach County71.2Baker County: 68.1 %Baker County68.1Marion County: 66 %Marion County66Citrus County: 65.2 %Citrus County65.2Sarasota County: 63.6 %Sarasota County63.6Hamilton County: 60.1 %Hamilton County60.1Pinellas County: 59.5 %Pinellas County59.5Columbia County: 58.4 %Columbia County58.4Miami-Dade County: 56.7 %Miami-Dade County56.7Santa Rosa County: 56.7 %Santa Rosa County56.7Leon County: 56.5 %Leon County56.5Holmes County: 51.8 %Holmes County51.8Escambia County: 48.8 %Escambia County48.8Bay County: 48.2 %Bay County48.2Broward County: 43.3 %Broward County43.3Duval County: 42.7 %Duval County42.7Hillsborough County: 42.7 %Hillsborough County42.7
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Putnam County99.7+0.3 pts
2Liberty County98+0.5 pts
3Indian River County97.80 pts
4St. Lucie County97.5-0.8 pts
5Flagler County97.3-0.2 pts
6Highlands County95.8-0.8 pts
7Lee County94.5+15.7 pts
8Manatee County93.4-2.9 pts
9Osceola County92.7-2.9 pts
10Lake County92.6-3.3 pts
11Okaloosa County90.5-0.7 pts
12Pasco County88.5-3.5 pts
13Seminole County82.1+2.8 pts
14Martin County77.5-1.2 pts
15Brevard County76.4-2.5 pts
16Polk County75.3+2.6 pts
17Wakulla County74.5-1.9 pts
18Alachua County74-6.7 pts
19Orange County73.2-13.6 pts
20Collier County71.9-7.9 pts
21Volusia County71.8+5.5 pts
22Palm Beach County71.2-4.1 pts
23Baker County68.1-4.8 pts
24Marion County66-5.3 pts
25Citrus County65.2-1.8 pts
26Sarasota County63.6-1.8 pts
27Hamilton County60.1+4 pts
28Pinellas County59.5-2.4 pts
29Columbia County58.4-6.1 pts
30Miami-Dade County56.7-14.3 pts
30Santa Rosa County56.7-8.8 pts
32Leon County56.5-1.5 pts
33Holmes County51.8-4.1 pts
34Escambia County48.8-3.5 pts
35Bay County48.2-11.5 pts
36Broward County43.3-10.7 pts
37Duval County42.7+3.2 pts
37Hillsborough County42.7-5.2 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 2023 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), 2023) [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), 2023. 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=2023. 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), 2023. 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=2023.

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), 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_florida_by_2023,
  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), 2023}},
  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=2023. 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), 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2023.
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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Rank Counties in Florida by share of days with good air quality (US EPA AQI) using official data, and cite the source.
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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 2023, according to EPA.

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

Hillsborough County, with 42.7% in 2023.

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 2023 and are not ranked.

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

Counties in Florida: more rankings