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 39 counties in 2017, at 52. Putnam County had the lowest, at 15. The median was 42. Source: the U.S. Environmental Protection Agency.

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Highest52Broward County
Lowest15Putnam County
Median4239 counties

Map of counties, 2017

Alachua County: 42 indexBaker County: 33 indexBay County: 46 indexBrevard County: 43 indexBroward County: 52 indexCitrus County: 46 indexCollier County: 39 indexColumbia County: 45 indexDuval County: 46 indexEscambia County: 41 indexFlagler County: 33 indexHamilton County: 45 indexHighlands County: 32 indexHillsborough County: 52 indexHolmes County: 45 indexIndian River County: 38 indexLake County: 35 indexLee County: 40 indexLeon County: 49 indexLiberty County: 31 indexManatee County: 35 indexMarion County: 43 indexMartin County: 42 indexMiami-Dade County: 51 indexNassau County: 47 indexOkaloosa County: 35 indexOrange County: 49 indexOsceola County: 34 indexPalm Beach County: 49 indexPasco County: 37 indexPinellas County: 48 indexPolk County: 47 indexPutnam County: 15 indexSt. Lucie County: 35 indexSanta Rosa County: 47 indexSarasota County: 48 indexSeminole County: 38 indexVolusia County: 41 indexWakulla County: 41 index
  • Under 35
  • 35 to 39
  • 39 to 42
  • 42 to 46
  • 46 to 48
  • 48 and over
  • No data
index, 2017. 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, 2017

Broward County: 52 indexBroward County52Hillsborough County: 52 indexHillsborough County52Miami-Dade County: 51 indexMiami-Dade County51Leon County: 49 indexLeon County49Orange County: 49 indexOrange County49Palm Beach County: 49 indexPalm Beach County49Pinellas County: 48 indexPinellas County48Sarasota County: 48 indexSarasota County48Nassau County: 47 indexNassau County47Polk County: 47 indexPolk County47Santa Rosa County: 47 indexSanta Rosa County47Bay County: 46 indexBay County46Citrus County: 46 indexCitrus County46Duval County: 46 indexDuval County46Columbia County: 45 indexColumbia County45Hamilton County: 45 indexHamilton County45Holmes County: 45 indexHolmes County45Brevard County: 43 indexBrevard County43Marion County: 43 indexMarion County43Alachua County: 42 indexAlachua County42Martin County: 42 indexMartin County42Escambia County: 41 indexEscambia County41Volusia County: 41 indexVolusia County41Wakulla County: 41 indexWakulla County41Lee County: 40 indexLee County40Collier County: 39 indexCollier County39Indian River County: 38 indexIndian River County38Seminole County: 38 indexSeminole County38Pasco County: 37 indexPasco County37Lake County: 35 indexLake County35Manatee County: 35 indexManatee County35Okaloosa County: 35 indexOkaloosa County35St. Lucie County: 35 indexSt. Lucie County35Osceola County: 34 indexOsceola County34Baker County: 33 indexBaker County33Flagler County: 33 indexFlagler County33Highlands County: 32 indexHighlands County32Liberty County: 31 indexLiberty County31Putnam County: 15 indexPutnam County15Broward County: 52 indexBroward County52Hillsborough County: 52 indexHillsborough County52Miami-Dade County: 51 indexMiami-Dade County51Leon County: 49 indexLeon County49Orange County: 49 indexOrange County49Palm Beach County: 49 indexPalm Beach County49Pinellas County: 48 indexPinellas County48Sarasota County: 48 indexSarasota County48Nassau County: 47 indexNassau County47Polk County: 47 indexPolk County47Santa Rosa County: 47 indexSanta Rosa County47Bay County: 46 indexBay County46Citrus County: 46 indexCitrus County46Duval County: 46 indexDuval County46Columbia County: 45 indexColumbia County45Hamilton County: 45 indexHamilton County45Holmes County: 45 indexHolmes County45Brevard County: 43 indexBrevard County43Marion County: 43 indexMarion County43Alachua County: 42 indexAlachua County42Martin County: 42 indexMartin County42Escambia County: 41 indexEscambia County41Volusia County: 41 indexVolusia County41Wakulla County: 41 indexWakulla County41Lee County: 40 indexLee County40Collier County: 39 indexCollier County39Indian River County: 38 indexIndian River County38Seminole County: 38 indexSeminole County38Pasco County: 37 indexPasco County37Lake County: 35 indexLake County35Manatee County: 35 indexManatee County35Okaloosa County: 35 indexOkaloosa County35St. Lucie County: 35 indexSt. Lucie County35Osceola County: 34 indexOsceola County34Baker County: 33 indexBaker County33Flagler County: 33 indexFlagler County33Highlands County: 32 indexHighlands County32Liberty County: 31 indexLiberty County31Putnam County: 15 indexPutnam County15
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties2017
index		Change on 2016
1Broward County52+5
1Hillsborough County52+1
3Miami-Dade County51-1
4Leon County49+1
4Orange County49+2
4Palm Beach County49+2
7Pinellas County48+3
7Sarasota County48+1
9Nassau County47+2
9Polk County47+3
9Santa Rosa County47+4
12Bay County46+3
12Citrus County46+1
12Duval County46-2
15Columbia County45+2
15Hamilton County45+1
15Holmes County45-1
18Brevard County43+1
18Marion County430
20Alachua County420
20Martin County42+1
22Escambia County41-3
22Volusia County41-1
22Wakulla County410
25Lee County40-2
26Collier County39-4
27Indian River County38-1
27Seminole County380
29Pasco County370
30Lake County35-2
30Manatee County35-1
30Okaloosa County35-1
30St. Lucie County35-2
34Osceola County34-1
35Baker County33-1
35Flagler County33-2
37Highlands County32-1
38Liberty County31-2
39Putnam County15+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. 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: 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), 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: median daily AQI, Counties in Florida by median Air Quality Index (US EPA), 2017. 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=2017. 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), 2017. 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=2017.

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), 2017 [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=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: median daily AQI: Counties in Florida by median Air Quality Index (US EPA), 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/median-air-quality-index/florida-counties?period=2017. 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), 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/median-air-quality-index/florida-counties?period=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/florida-counties?period=2017.
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 2017, according to the U.S. Environmental Protection Agency.

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

Putnam County, with 15 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: median daily AQI. Retrieved 2026-10-12. 3 counties have no value for 2017 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Florida: more rankings