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 2019, at 98.6%. Duval County had the lowest, at 45.4%. The median was 78.3%. Source: EPA.

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Highest98.6Putnam County
Lowest45.4Duval County
Median78.339 counties

Map of counties, 2019

Alachua County: 79.4 %Baker County: 94.5 %Bay County: 67.2 %Brevard County: 87.7 %Broward County: 58.7 %Citrus County: 72 %Collier County: 80.4 %Columbia County: 63.1 %Duval County: 45.4 %Escambia County: 67.9 %Flagler County: 98.1 %Hamilton County: 67.7 %Highlands County: 96.1 %Hillsborough County: 55.3 %Holmes County: 57.2 %Indian River County: 96.7 %Lake County: 91.2 %Lee County: 79.2 %Leon County: 59.7 %Liberty County: 96.6 %Manatee County: 91.2 %Marion County: 66.8 %Martin County: 81.8 %Miami-Dade County: 67.5 %Nassau County: 75.2 %Okaloosa County: 92.3 %Orange County: 81.4 %Osceola County: 92.9 %Palm Beach County: 76.5 %Pasco County: 92.1 %Pinellas County: 61.1 %Polk County: 73.4 %Putnam County: 98.6 %St. Lucie County: 97.2 %Santa Rosa County: 62.9 %Sarasota County: 73.4 %Seminole County: 81.1 %Volusia County: 78.3 %Wakulla County: 76.2 %
  • Under 63
  • 63 to 71
  • 71 to 78
  • 78 to 84
  • 84 to 94
  • 94 and over
  • No data
%, 2019. 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, 2019

Putnam County: 98.6 %Putnam County98.6Flagler County: 98.1 %Flagler County98.1St. Lucie County: 97.2 %St. Lucie County97.2Indian River County: 96.7 %Indian River County96.7Liberty County: 96.6 %Liberty County96.6Highlands County: 96.1 %Highlands County96.1Baker County: 94.5 %Baker County94.5Osceola County: 92.9 %Osceola County92.9Okaloosa County: 92.3 %Okaloosa County92.3Pasco County: 92.1 %Pasco County92.1Lake County: 91.2 %Lake County91.2Manatee County: 91.2 %Manatee County91.2Brevard County: 87.7 %Brevard County87.7Martin County: 81.8 %Martin County81.8Orange County: 81.4 %Orange County81.4Seminole County: 81.1 %Seminole County81.1Collier County: 80.4 %Collier County80.4Alachua County: 79.4 %Alachua County79.4Lee County: 79.2 %Lee County79.2Volusia County: 78.3 %Volusia County78.3Palm Beach County: 76.5 %Palm Beach County76.5Wakulla County: 76.2 %Wakulla County76.2Nassau County: 75.2 %Nassau County75.2Polk County: 73.4 %Polk County73.4Sarasota County: 73.4 %Sarasota County73.4Citrus County: 72 %Citrus County72Escambia County: 67.9 %Escambia County67.9Hamilton County: 67.7 %Hamilton County67.7Miami-Dade County: 67.5 %Miami-Dade County67.5Bay County: 67.2 %Bay County67.2Marion County: 66.8 %Marion County66.8Columbia County: 63.1 %Columbia County63.1Santa Rosa County: 62.9 %Santa Rosa County62.9Pinellas County: 61.1 %Pinellas County61.1Leon County: 59.7 %Leon County59.7Broward County: 58.7 %Broward County58.7Holmes County: 57.2 %Holmes County57.2Hillsborough County: 55.3 %Hillsborough County55.3Duval County: 45.4 %Duval County45.4Putnam County: 98.6 %Putnam County98.6Flagler County: 98.1 %Flagler County98.1St. Lucie County: 97.2 %St. Lucie County97.2Indian River County: 96.7 %Indian River County96.7Liberty County: 96.6 %Liberty County96.6Highlands County: 96.1 %Highlands County96.1Baker County: 94.5 %Baker County94.5Osceola County: 92.9 %Osceola County92.9Okaloosa County: 92.3 %Okaloosa County92.3Pasco County: 92.1 %Pasco County92.1Lake County: 91.2 %Lake County91.2Manatee County: 91.2 %Manatee County91.2Brevard County: 87.7 %Brevard County87.7Martin County: 81.8 %Martin County81.8Orange County: 81.4 %Orange County81.4Seminole County: 81.1 %Seminole County81.1Collier County: 80.4 %Collier County80.4Alachua County: 79.4 %Alachua County79.4Lee County: 79.2 %Lee County79.2Volusia County: 78.3 %Volusia County78.3Palm Beach County: 76.5 %Palm Beach County76.5Wakulla County: 76.2 %Wakulla County76.2Nassau County: 75.2 %Nassau County75.2Polk County: 73.4 %Polk County73.4Sarasota County: 73.4 %Sarasota County73.4Citrus County: 72 %Citrus County72Escambia County: 67.9 %Escambia County67.9Hamilton County: 67.7 %Hamilton County67.7Miami-Dade County: 67.5 %Miami-Dade County67.5Bay County: 67.2 %Bay County67.2Marion County: 66.8 %Marion County66.8Columbia County: 63.1 %Columbia County63.1Santa Rosa County: 62.9 %Santa Rosa County62.9Pinellas County: 61.1 %Pinellas County61.1Leon County: 59.7 %Leon County59.7Broward County: 58.7 %Broward County58.7Holmes County: 57.2 %Holmes County57.2Hillsborough County: 55.3 %Hillsborough County55.3Duval County: 45.4 %Duval County45.4
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1Putnam County98.6-1.1 pts
2Flagler County98.1+2.4 pts
3St. Lucie County97.2+2.2 pts
4Indian River County96.7+5.4 pts
5Liberty County96.6+0.5 pts
6Highlands County96.1+0.1 pts
7Baker County94.5-0.2 pts
8Osceola County92.9+2.5 pts
9Okaloosa County92.3+0.2 pts
10Pasco County92.1+3.3 pts
11Lake County91.20 pts
11Manatee County91.2+0.8 pts
13Brevard County87.7+8.8 pts
14Martin County81.8+3.7 pts
15Orange County81.4+3 pts
16Seminole County81.1-3.6 pts
17Collier County80.4+8.6 pts
18Alachua County79.4-7.7 pts
19Lee County79.2-1.3 pts
20Volusia County78.3-1.4 pts
21Palm Beach County76.5+5.3 pts
22Wakulla County76.2+0.8 pts
23Nassau County75.2+4.4 pts
24Polk County73.4-6.1 pts
24Sarasota County73.4+7.9 pts
26Citrus County72+1.4 pts
27Escambia County67.9-15.9 pts
28Hamilton County67.7+0.9 pts
29Miami-Dade County67.5+14.3 pts
30Bay County67.2+2.5 pts
31Marion County66.8-8 pts
32Columbia County63.1-11.3 pts
33Santa Rosa County62.9-3.2 pts
34Pinellas County61.1-6 pts
35Leon County59.7-1.4 pts
36Broward County58.7+6.4 pts
37Holmes County57.2-11 pts
38Hillsborough County55.3+9.3 pts
39Duval County45.4-3.1 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 2019 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), 2019) [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), 2019. 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=2019. 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), 2019. 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=2019.

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), 2019 [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=2019 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_florida_by_2019,
  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), 2019}},
  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=2019. 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), 2019
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=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2019.
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 98.6% in 2019, according to EPA.

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

Duval County, with 45.4% in 2019.

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 2019 and are not ranked.

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

Counties in Florida: more rankings