Data / Rankings / Median Air Quality Index (US EPA) / Counties in Florida

Counties in Florida by median Air Quality Index (US EPA)

Broward County had the highest median Air Quality Index (US EPA) of 38 counties in 2023, at 52. Putnam County had the lowest, at 17. The median was 43. Source: the U.S. Environmental Protection Agency.

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Highest52Broward County
Lowest17Putnam County
Median4338 counties

Map of counties, 2023

Alachua County: 40 indexBaker County: 43 indexBay County: 51 indexBrevard County: 43 indexBroward County: 52 indexCitrus County: 45 indexCollier County: 43 indexColumbia County: 47 indexDuval County: 52 indexEscambia County: 51 indexFlagler County: 35 indexHamilton County: 46 indexHighlands County: 35 indexHillsborough County: 51 indexHolmes County: 49 indexIndian River County: 34 indexLake County: 37 indexLee County: 35 indexLeon County: 47 indexLiberty County: 33 indexManatee County: 35 indexMarion County: 45 indexMartin County: 41 indexMiami-Dade County: 48 indexOkaloosa County: 37 indexOrange County: 43 indexOsceola County: 36 indexPalm Beach County: 43 indexPasco County: 39 indexPinellas County: 47 indexPolk County: 42 indexPutnam County: 17 indexSt. Lucie County: 35 indexSanta Rosa County: 47 indexSarasota County: 47 indexSeminole County: 40 indexVolusia County: 44 indexWakulla County: 39 index
  • Under 35
  • 35 to 39
  • 39 to 43
  • 43 to 46
  • 46 to 48
  • 48 and over
  • No data
index, 2023. Hatched areas have no value for this period. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2023

Broward County: 52 indexBroward County52Duval County: 52 indexDuval County52Bay County: 51 indexBay County51Escambia County: 51 indexEscambia County51Hillsborough County: 51 indexHillsborough County51Holmes County: 49 indexHolmes County49Miami-Dade County: 48 indexMiami-Dade County48Columbia County: 47 indexColumbia County47Leon County: 47 indexLeon County47Pinellas County: 47 indexPinellas County47Santa Rosa County: 47 indexSanta Rosa County47Sarasota County: 47 indexSarasota County47Hamilton County: 46 indexHamilton County46Citrus County: 45 indexCitrus County45Marion County: 45 indexMarion County45Volusia County: 44 indexVolusia County44Baker County: 43 indexBaker County43Brevard County: 43 indexBrevard County43Collier County: 43 indexCollier County43Orange County: 43 indexOrange County43Palm Beach County: 43 indexPalm Beach County43Polk County: 42 indexPolk County42Martin County: 41 indexMartin County41Alachua County: 40 indexAlachua County40Seminole County: 40 indexSeminole County40Pasco County: 39 indexPasco County39Wakulla County: 39 indexWakulla County39Lake County: 37 indexLake County37Okaloosa County: 37 indexOkaloosa County37Osceola County: 36 indexOsceola County36Flagler County: 35 indexFlagler County35Highlands County: 35 indexHighlands County35Lee County: 35 indexLee County35Manatee County: 35 indexManatee County35St. Lucie County: 35 indexSt. Lucie County35Indian River County: 34 indexIndian River County34Liberty County: 33 indexLiberty County33Putnam County: 17 indexPutnam County17Broward County: 52 indexBroward County52Duval County: 52 indexDuval County52Bay County: 51 indexBay County51Escambia County: 51 indexEscambia County51Hillsborough County: 51 indexHillsborough County51Holmes County: 49 indexHolmes County49Miami-Dade County: 48 indexMiami-Dade County48Columbia County: 47 indexColumbia County47Leon County: 47 indexLeon County47Pinellas County: 47 indexPinellas County47Santa Rosa County: 47 indexSanta Rosa County47Sarasota County: 47 indexSarasota County47Hamilton County: 46 indexHamilton County46Citrus County: 45 indexCitrus County45Marion County: 45 indexMarion County45Volusia County: 44 indexVolusia County44Baker County: 43 indexBaker County43Brevard County: 43 indexBrevard County43Collier County: 43 indexCollier County43Orange County: 43 indexOrange County43Palm Beach County: 43 indexPalm Beach County43Polk County: 42 indexPolk County42Martin County: 41 indexMartin County41Alachua County: 40 indexAlachua County40Seminole County: 40 indexSeminole County40Pasco County: 39 indexPasco County39Wakulla County: 39 indexWakulla County39Lake County: 37 indexLake County37Okaloosa County: 37 indexOkaloosa County37Osceola County: 36 indexOsceola County36Flagler County: 35 indexFlagler County35Highlands County: 35 indexHighlands County35Lee County: 35 indexLee County35Manatee County: 35 indexManatee County35St. Lucie County: 35 indexSt. Lucie County35Indian River County: 34 indexIndian River County34Liberty County: 33 indexLiberty County33Putnam County: 17 indexPutnam County17
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties2023
index		Change on 2022
1Broward County52+3
1Duval County52-1
3Bay County51+5
3Escambia County51+2
3Hillsborough County510
6Holmes County49+2
7Miami-Dade County48+4
8Columbia County47+2
8Leon County470
8Pinellas County47+1
8Santa Rosa County47+3
8Sarasota County47+2
13Hamilton County46-1
14Citrus County450
14Marion County45+1
16Volusia County44-1
17Baker County430
17Brevard County430
17Collier County43+3
17Orange County43+4
17Palm Beach County43+2
22Polk County42-2
23Martin County41-1
24Alachua County40-1
24Seminole County40-2
26Pasco County39+2
26Wakulla County39-2
28Lake County37+2
28Okaloosa County37-2
30Osceola County36+2
31Flagler County35+1
31Highlands County35+2
31Lee County35-7
31Manatee County35+2
31St. Lucie County35+2
36Indian River County34+1
37Liberty County33+1
38Putnam County17+1

Other periods

About this ranking

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

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: median daily AQI. 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: median daily AQI (Counties in Florida by median Air Quality Index (US EPA), 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: median daily AQI, Counties in Florida by median Air Quality Index (US EPA), 2023. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/median-air-quality-index/florida-counties?period=2023. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Counties in Florida by median Air Quality Index (US EPA), 2023. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/median-air-quality-index/florida-counties?period=2023.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Counties in Florida by median Air Quality Index (US EPA), 2023 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/median-air-quality-index/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: median daily AQI: Counties in Florida by median Air Quality Index (US EPA), 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/median-air-quality-index/florida-counties?period=2023. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. 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: median daily AQI: Counties in Florida by median Air Quality Index (US EPA), 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/median-air-quality-index/florida-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/florida-counties?period=2023.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Rank Counties in Florida by median Air Quality Index (US EPA) using official data, and cite the source.
rank_places {"indicator":"aqi_median","level":"province","within":"Florida","limit":10}
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Questions

Which county has the highest median Air Quality Index (US EPA)?

Broward County, with 52 in 2023, according to the U.S. Environmental Protection Agency.

Which county has the lowest median Air Quality Index (US EPA)?

Putnam County, with 17 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: median daily AQI. Retrieved 2026-10-12. 4 counties have no value for 2023 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Florida: more rankings