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

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

Duval County had the highest median Air Quality Index (US EPA) of 39 counties in 2019, at 51. Putnam County had the lowest, at 17. The median was 40. Source: the U.S. Environmental Protection Agency.

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Highest51Duval County
Lowest17Putnam County
Median4039 counties

Map of counties, 2019

Alachua County: 39 indexBaker County: 33 indexBay County: 44 indexBrevard County: 39 indexBroward County: 47 indexCitrus County: 40 indexCollier County: 40 indexColumbia County: 46 indexDuval County: 51 indexEscambia County: 44 indexFlagler County: 34 indexHamilton County: 44 indexHighlands County: 36 indexHillsborough County: 49 indexHolmes County: 47 indexIndian River County: 36 indexLake County: 35 indexLee County: 40 indexLeon County: 46 indexLiberty County: 33 indexManatee County: 36 indexMarion County: 44 indexMartin County: 41 indexMiami-Dade County: 44 indexNassau County: 41 indexOkaloosa County: 36 indexOrange County: 39 indexOsceola County: 34 indexPalm Beach County: 40 indexPasco County: 36 indexPinellas County: 47 indexPolk County: 42 indexPutnam County: 17 indexSt. Lucie County: 34 indexSanta Rosa County: 44 indexSarasota County: 43 indexSeminole County: 39 indexVolusia County: 41 indexWakulla County: 39 index
  • Under 35
  • 35 to 39
  • 39 to 40
  • 40 to 43
  • 43 to 45
  • 45 and over
  • No data
index, 2019. 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, 2019

Duval County: 51 indexDuval County51Hillsborough County: 49 indexHillsborough County49Broward County: 47 indexBroward County47Holmes County: 47 indexHolmes County47Pinellas County: 47 indexPinellas County47Columbia County: 46 indexColumbia County46Leon County: 46 indexLeon County46Bay County: 44 indexBay County44Escambia County: 44 indexEscambia County44Hamilton County: 44 indexHamilton County44Marion County: 44 indexMarion County44Miami-Dade County: 44 indexMiami-Dade County44Santa Rosa County: 44 indexSanta Rosa County44Sarasota County: 43 indexSarasota County43Polk County: 42 indexPolk County42Martin County: 41 indexMartin County41Nassau County: 41 indexNassau County41Volusia County: 41 indexVolusia County41Citrus County: 40 indexCitrus County40Collier County: 40 indexCollier County40Lee County: 40 indexLee County40Palm Beach County: 40 indexPalm Beach County40Alachua County: 39 indexAlachua County39Brevard County: 39 indexBrevard County39Orange County: 39 indexOrange County39Seminole County: 39 indexSeminole County39Wakulla County: 39 indexWakulla County39Highlands County: 36 indexHighlands County36Indian River County: 36 indexIndian River County36Manatee County: 36 indexManatee County36Okaloosa County: 36 indexOkaloosa County36Pasco County: 36 indexPasco County36Lake County: 35 indexLake County35Flagler County: 34 indexFlagler County34Osceola County: 34 indexOsceola County34St. Lucie County: 34 indexSt. Lucie County34Baker County: 33 indexBaker County33Liberty County: 33 indexLiberty County33Putnam County: 17 indexPutnam County17Duval County: 51 indexDuval County51Hillsborough County: 49 indexHillsborough County49Broward County: 47 indexBroward County47Holmes County: 47 indexHolmes County47Pinellas County: 47 indexPinellas County47Columbia County: 46 indexColumbia County46Leon County: 46 indexLeon County46Bay County: 44 indexBay County44Escambia County: 44 indexEscambia County44Hamilton County: 44 indexHamilton County44Marion County: 44 indexMarion County44Miami-Dade County: 44 indexMiami-Dade County44Santa Rosa County: 44 indexSanta Rosa County44Sarasota County: 43 indexSarasota County43Polk County: 42 indexPolk County42Martin County: 41 indexMartin County41Nassau County: 41 indexNassau County41Volusia County: 41 indexVolusia County41Citrus County: 40 indexCitrus County40Collier County: 40 indexCollier County40Lee County: 40 indexLee County40Palm Beach County: 40 indexPalm Beach County40Alachua County: 39 indexAlachua County39Brevard County: 39 indexBrevard County39Orange County: 39 indexOrange County39Seminole County: 39 indexSeminole County39Wakulla County: 39 indexWakulla County39Highlands County: 36 indexHighlands County36Indian River County: 36 indexIndian River County36Manatee County: 36 indexManatee County36Okaloosa County: 36 indexOkaloosa County36Pasco County: 36 indexPasco County36Lake County: 35 indexLake County35Flagler County: 34 indexFlagler County34Osceola County: 34 indexOsceola County34St. Lucie County: 34 indexSt. Lucie County34Baker County: 33 indexBaker County33Liberty 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

RankCounties2019
index		Change on 2018
1Duval County510
2Hillsborough County49-2
3Broward County47-2
3Holmes County47+4
3Pinellas County47+1
6Columbia County46+5
6Leon County460
8Bay County440
8Escambia County44+6
8Hamilton County44+1
8Marion County44+2
8Miami-Dade County44-5
8Santa Rosa County44+1
14Sarasota County43-2
15Polk County42+3
16Martin County41-1
16Nassau County41-2
16Volusia County410
19Citrus County40-3
19Collier County40-2
19Lee County40+2
19Palm Beach County40-2
23Alachua County39+2
23Brevard County39-2
23Orange County39-1
23Seminole County390
23Wakulla County39-2
28Highlands County36+5
28Indian River County360
28Manatee County36+2
28Okaloosa County36+3
28Pasco County36+1
33Lake County35+2
34Flagler County34+2
34Osceola County34+1
34St. Lucie County34+1
37Baker County33+2
37Liberty County33+2
39Putnam County17+3

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. 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: 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), 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: median daily AQI, Counties in Florida by median Air Quality Index (US EPA), 2019. 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=2019. 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), 2019. 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=2019.

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), 2019 [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=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: median daily AQI: Counties in Florida by median Air Quality Index (US EPA), 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/median-air-quality-index/florida-counties?period=2019. 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), 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/median-air-quality-index/florida-counties?period=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/florida-counties?period=2019.
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.
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Questions

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

Duval County, with 51 in 2019, according to the U.S. Environmental Protection Agency.

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

Putnam County, with 17 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: median daily AQI. Retrieved 2026-10-12. 3 counties have no value for 2019 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Florida: more rankings