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 2017, at 99.4%. Broward County had the lowest, at 41.7%. The median was 72.2%. Source: EPA.

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Highest99.4Putnam County
Lowest41.7Broward County
Median72.239 counties

Map of counties, 2017

Alachua County: 75.2 %Baker County: 95.5 %Bay County: 62.2 %Brevard County: 72.2 %Broward County: 41.7 %Citrus County: 60.3 %Collier County: 75.6 %Columbia County: 65.3 %Duval County: 61.4 %Escambia County: 78.4 %Flagler County: 96.1 %Hamilton County: 61.2 %Highlands County: 95.5 %Hillsborough County: 46.4 %Holmes County: 63.6 %Indian River County: 90.7 %Lake County: 91.8 %Lee County: 76.6 %Leon County: 52.1 %Liberty County: 98.6 %Manatee County: 93.2 %Marion County: 71.2 %Martin County: 73.3 %Miami-Dade County: 50 %Nassau County: 57.6 %Okaloosa County: 94.5 %Orange County: 53.4 %Osceola County: 95 %Palm Beach County: 52.4 %Pasco County: 89.7 %Pinellas County: 54.8 %Polk County: 59.5 %Putnam County: 99.4 %St. Lucie County: 94.1 %Santa Rosa County: 57.1 %Sarasota County: 55 %Seminole County: 87.6 %Volusia County: 79.1 %Wakulla County: 69.8 %
  • Under 55
  • 55 to 61
  • 61 to 72
  • 72 to 82
  • 82 to 94
  • 94 and over
  • No data
%, 2017. 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, 2017

Putnam County: 99.4 %Putnam County99.4Liberty County: 98.6 %Liberty County98.6Flagler County: 96.1 %Flagler County96.1Baker County: 95.5 %Baker County95.5Highlands County: 95.5 %Highlands County95.5Osceola County: 95 %Osceola County95Okaloosa County: 94.5 %Okaloosa County94.5St. Lucie County: 94.1 %St. Lucie County94.1Manatee County: 93.2 %Manatee County93.2Lake County: 91.8 %Lake County91.8Indian River County: 90.7 %Indian River County90.7Pasco County: 89.7 %Pasco County89.7Seminole County: 87.6 %Seminole County87.6Volusia County: 79.1 %Volusia County79.1Escambia County: 78.4 %Escambia County78.4Lee County: 76.6 %Lee County76.6Collier County: 75.6 %Collier County75.6Alachua County: 75.2 %Alachua County75.2Martin County: 73.3 %Martin County73.3Brevard County: 72.2 %Brevard County72.2Marion County: 71.2 %Marion County71.2Wakulla County: 69.8 %Wakulla County69.8Columbia County: 65.3 %Columbia County65.3Holmes County: 63.6 %Holmes County63.6Bay County: 62.2 %Bay County62.2Duval County: 61.4 %Duval County61.4Hamilton County: 61.2 %Hamilton County61.2Citrus County: 60.3 %Citrus County60.3Polk County: 59.5 %Polk County59.5Nassau County: 57.6 %Nassau County57.6Santa Rosa County: 57.1 %Santa Rosa County57.1Sarasota County: 55 %Sarasota County55Pinellas County: 54.8 %Pinellas County54.8Orange County: 53.4 %Orange County53.4Palm Beach County: 52.4 %Palm Beach County52.4Leon County: 52.1 %Leon County52.1Miami-Dade County: 50 %Miami-Dade County50Hillsborough County: 46.4 %Hillsborough County46.4Broward County: 41.7 %Broward County41.7Putnam County: 99.4 %Putnam County99.4Liberty County: 98.6 %Liberty County98.6Flagler County: 96.1 %Flagler County96.1Baker County: 95.5 %Baker County95.5Highlands County: 95.5 %Highlands County95.5Osceola County: 95 %Osceola County95Okaloosa County: 94.5 %Okaloosa County94.5St. Lucie County: 94.1 %St. Lucie County94.1Manatee County: 93.2 %Manatee County93.2Lake County: 91.8 %Lake County91.8Indian River County: 90.7 %Indian River County90.7Pasco County: 89.7 %Pasco County89.7Seminole County: 87.6 %Seminole County87.6Volusia County: 79.1 %Volusia County79.1Escambia County: 78.4 %Escambia County78.4Lee County: 76.6 %Lee County76.6Collier County: 75.6 %Collier County75.6Alachua County: 75.2 %Alachua County75.2Martin County: 73.3 %Martin County73.3Brevard County: 72.2 %Brevard County72.2Marion County: 71.2 %Marion County71.2Wakulla County: 69.8 %Wakulla County69.8Columbia County: 65.3 %Columbia County65.3Holmes County: 63.6 %Holmes County63.6Bay County: 62.2 %Bay County62.2Duval County: 61.4 %Duval County61.4Hamilton County: 61.2 %Hamilton County61.2Citrus County: 60.3 %Citrus County60.3Polk County: 59.5 %Polk County59.5Nassau County: 57.6 %Nassau County57.6Santa Rosa County: 57.1 %Santa Rosa County57.1Sarasota County: 55 %Sarasota County55Pinellas County: 54.8 %Pinellas County54.8Orange County: 53.4 %Orange County53.4Palm Beach County: 52.4 %Palm Beach County52.4Leon County: 52.1 %Leon County52.1Miami-Dade County: 50 %Miami-Dade County50Hillsborough County: 46.4 %Hillsborough County46.4Broward County: 41.7 %Broward County41.7
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Putnam County99.4-0.6 pts
2Liberty County98.6+1.2 pts
3Flagler County96.1+0.5 pts
4Baker County95.5+2.2 pts
4Highlands County95.5-0.1 pts
6Osceola County95+1.6 pts
7Okaloosa County94.50 pts
8St. Lucie County94.1+0.2 pts
9Manatee County93.2-0.5 pts
10Lake County91.8+2.3 pts
11Indian River County90.7-2.2 pts
12Pasco County89.7+0.1 pts
13Seminole County87.6-1.4 pts
14Volusia County79.1+2.2 pts
15Escambia County78.4+7.4 pts
16Lee County76.6-0.4 pts
17Collier County75.6-2.5 pts
18Alachua County75.2-2 pts
19Martin County73.3-3.8 pts
20Brevard County72.2-9.2 pts
21Marion County71.2+1.8 pts
22Wakulla County69.8-3.8 pts
23Columbia County65.3-2.8 pts
24Holmes County63.6+3.8 pts
25Bay County62.2-14 pts
26Duval County61.4+4 pts
27Hamilton County61.2-6 pts
28Citrus County60.3-1.8 pts
29Polk County59.5-9.1 pts
30Nassau County57.6-6.2 pts
31Santa Rosa County57.1-15.9 pts
32Sarasota County55-5.9 pts
33Pinellas County54.8-12.7 pts
34Orange County53.4-5.1 pts
35Palm Beach County52.4-4.4 pts
36Leon County52.1-4.4 pts
37Miami-Dade County50+7.5 pts
38Hillsborough County46.4-2.2 pts
39Broward County41.7-17.1 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 2017 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), 2017) [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), 2017. 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=2017. 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), 2017. 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=2017.

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), 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_florida_by_2017,
  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), 2017}},
  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=2017. 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), 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2017.
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 99.4% in 2017, according to EPA.

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

Broward County, with 41.7% in 2017.

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 2017 and are not ranked.

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

Counties in Florida: more rankings