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 2018, at 99.7%. Hillsborough County had the lowest, at 46%. The median was 78.4%. Source: EPA.

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Highest99.7Putnam County
Lowest46Hillsborough County
Median78.439 counties

Map of counties, 2018

Alachua County: 87.1 %Baker County: 94.7 %Bay County: 64.7 %Brevard County: 78.9 %Broward County: 52.3 %Citrus County: 70.6 %Collier County: 71.8 %Columbia County: 74.4 %Duval County: 48.5 %Escambia County: 83.8 %Flagler County: 95.7 %Hamilton County: 66.8 %Highlands County: 96 %Hillsborough County: 46 %Holmes County: 68.2 %Indian River County: 91.3 %Lake County: 91.2 %Lee County: 80.5 %Leon County: 61.1 %Liberty County: 96.1 %Manatee County: 90.4 %Marion County: 74.8 %Martin County: 78.1 %Miami-Dade County: 53.2 %Nassau County: 70.8 %Okaloosa County: 92.1 %Orange County: 78.4 %Osceola County: 90.4 %Palm Beach County: 71.2 %Pasco County: 88.8 %Pinellas County: 67.1 %Polk County: 79.5 %Putnam County: 99.7 %St. Lucie County: 95 %Santa Rosa County: 66.1 %Sarasota County: 65.5 %Seminole County: 84.7 %Volusia County: 79.7 %Wakulla County: 75.4 %
  • Under 66
  • 66 to 71
  • 71 to 78
  • 78 to 86
  • 86 to 92
  • 92 and over
  • No data
%, 2018. 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, 2018

Putnam County: 99.7 %Putnam County99.7Liberty County: 96.1 %Liberty County96.1Highlands County: 96 %Highlands County96Flagler County: 95.7 %Flagler County95.7St. Lucie County: 95 %St. Lucie County95Baker County: 94.7 %Baker County94.7Okaloosa County: 92.1 %Okaloosa County92.1Indian River County: 91.3 %Indian River County91.3Lake County: 91.2 %Lake County91.2Manatee County: 90.4 %Manatee County90.4Osceola County: 90.4 %Osceola County90.4Pasco County: 88.8 %Pasco County88.8Alachua County: 87.1 %Alachua County87.1Seminole County: 84.7 %Seminole County84.7Escambia County: 83.8 %Escambia County83.8Lee County: 80.5 %Lee County80.5Volusia County: 79.7 %Volusia County79.7Polk County: 79.5 %Polk County79.5Brevard County: 78.9 %Brevard County78.9Orange County: 78.4 %Orange County78.4Martin County: 78.1 %Martin County78.1Wakulla County: 75.4 %Wakulla County75.4Marion County: 74.8 %Marion County74.8Columbia County: 74.4 %Columbia County74.4Collier County: 71.8 %Collier County71.8Palm Beach County: 71.2 %Palm Beach County71.2Nassau County: 70.8 %Nassau County70.8Citrus County: 70.6 %Citrus County70.6Holmes County: 68.2 %Holmes County68.2Pinellas County: 67.1 %Pinellas County67.1Hamilton County: 66.8 %Hamilton County66.8Santa Rosa County: 66.1 %Santa Rosa County66.1Sarasota County: 65.5 %Sarasota County65.5Bay County: 64.7 %Bay County64.7Leon County: 61.1 %Leon County61.1Miami-Dade County: 53.2 %Miami-Dade County53.2Broward County: 52.3 %Broward County52.3Duval County: 48.5 %Duval County48.5Hillsborough County: 46 %Hillsborough County46Putnam County: 99.7 %Putnam County99.7Liberty County: 96.1 %Liberty County96.1Highlands County: 96 %Highlands County96Flagler County: 95.7 %Flagler County95.7St. Lucie County: 95 %St. Lucie County95Baker County: 94.7 %Baker County94.7Okaloosa County: 92.1 %Okaloosa County92.1Indian River County: 91.3 %Indian River County91.3Lake County: 91.2 %Lake County91.2Manatee County: 90.4 %Manatee County90.4Osceola County: 90.4 %Osceola County90.4Pasco County: 88.8 %Pasco County88.8Alachua County: 87.1 %Alachua County87.1Seminole County: 84.7 %Seminole County84.7Escambia County: 83.8 %Escambia County83.8Lee County: 80.5 %Lee County80.5Volusia County: 79.7 %Volusia County79.7Polk County: 79.5 %Polk County79.5Brevard County: 78.9 %Brevard County78.9Orange County: 78.4 %Orange County78.4Martin County: 78.1 %Martin County78.1Wakulla County: 75.4 %Wakulla County75.4Marion County: 74.8 %Marion County74.8Columbia County: 74.4 %Columbia County74.4Collier County: 71.8 %Collier County71.8Palm Beach County: 71.2 %Palm Beach County71.2Nassau County: 70.8 %Nassau County70.8Citrus County: 70.6 %Citrus County70.6Holmes County: 68.2 %Holmes County68.2Pinellas County: 67.1 %Pinellas County67.1Hamilton County: 66.8 %Hamilton County66.8Santa Rosa County: 66.1 %Santa Rosa County66.1Sarasota County: 65.5 %Sarasota County65.5Bay County: 64.7 %Bay County64.7Leon County: 61.1 %Leon County61.1Miami-Dade County: 53.2 %Miami-Dade County53.2Broward County: 52.3 %Broward County52.3Duval County: 48.5 %Duval County48.5Hillsborough County: 46 %Hillsborough County46
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Putnam County99.7+0.3 pts
2Liberty County96.1-2.5 pts
3Highlands County96+0.5 pts
4Flagler County95.7-0.4 pts
5St. Lucie County95+0.9 pts
6Baker County94.7-0.8 pts
7Okaloosa County92.1-2.4 pts
8Indian River County91.3+0.6 pts
9Lake County91.2-0.6 pts
10Manatee County90.4-2.8 pts
10Osceola County90.4-4.6 pts
12Pasco County88.8-0.9 pts
13Alachua County87.1+11.9 pts
14Seminole County84.7-2.9 pts
15Escambia County83.8+5.4 pts
16Lee County80.5+3.9 pts
17Volusia County79.7+0.6 pts
18Polk County79.5+20 pts
19Brevard County78.9+6.7 pts
20Orange County78.4+25 pts
21Martin County78.1+4.8 pts
22Wakulla County75.4+5.6 pts
23Marion County74.8+3.6 pts
24Columbia County74.4+9.1 pts
25Collier County71.8-3.8 pts
26Palm Beach County71.2+18.8 pts
27Nassau County70.8+13.2 pts
28Citrus County70.6+10.3 pts
29Holmes County68.2+4.6 pts
30Pinellas County67.1+12.3 pts
31Hamilton County66.8+5.6 pts
32Santa Rosa County66.1+9 pts
33Sarasota County65.5+10.5 pts
34Bay County64.7+2.5 pts
35Leon County61.1+9 pts
36Miami-Dade County53.2+3.2 pts
37Broward County52.3+10.6 pts
38Duval County48.5-12.9 pts
39Hillsborough County46-0.4 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 2018 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), 2018) [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), 2018. 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=2018. 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), 2018. 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=2018.

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), 2018 [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=2018 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_florida_by_2018,
  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), 2018}},
  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=2018. 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), 2018
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=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2018.
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 2018, according to EPA.

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

Hillsborough County, with 46% in 2018.

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 2018 and are not ranked.

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

Counties in Florida: more rankings