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 2015, at 100%. Hillsborough County had the lowest, at 44.1%. The median was 77%. Source: EPA.

Highest100Putnam County

Lowest44.1Hillsborough County

Median7739 counties

Map of counties, 2015

Under 65
65 to 69
69 to 77
77 to 87
87 to 97
97 and over
No data

%, 2015. 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, 2015

%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2015 (%)	Change on 2014
1	Putnam County	100	0 pts
2	Flagler County	98.6	+5.5 pts
3	Liberty County	98	+0.3 pts
4	Baker County	97.8	+1.9 pts
5	St. Lucie County	97.4	+2.1 pts
6	Okaloosa County	97	+4.7 pts
7	Highlands County	96.9	+3.5 pts
8	Osceola County	96.6	+5.8 pts
9	Indian River County	96.1	+5.8 pts
10	Lake County	95.3	+3.9 pts
11	Pasco County	94	+3.3 pts
12	Seminole County	92.5	+2.9 pts
13	Manatee County	92.1	+0.9 pts
14	Citrus County	85.2	+4.4 pts
15	Brevard County	84.7	+14.3 pts
16	Volusia County	80.8	+14 pts
17	Alachua County	79.7	+1.6 pts
18	Broward County	78.4	+10.2 pts
19	Columbia County	77.6	-7.3 pts
20	Martin County	77	+1 pts
21	Collier County	76.9	+4.3 pts
22	Lee County	75.6	+3 pts
23	Marion County	75.3	+13.9 pts
24	Bay County	69.6	+9.6 pts
24	Pinellas County	69.6	+11.5 pts
26	Nassau County	69.2	+15.8 pts
26	Wakulla County	69.2	-17.3 pts
28	Polk County	67.9	+11.3 pts
29	Palm Beach County	67.7	-1.6 pts
30	Hamilton County	67.5	+18.8 pts
31	Duval County	66	+15.9 pts
32	Orange County	65.5	+0.3 pts
33	Santa Rosa County	65.2	+6.8 pts
34	Holmes County	65.1	+8.9 pts
35	Sarasota County	62.2	+6.9 pts
36	Escambia County	58.1	+4.9 pts
37	Miami-Dade County	55.1	+11 pts
38	Leon County	47.7	+4.4 pts
39	Hillsborough County	44.1	+1.1 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 2015 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), 2015) [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), 2015. 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=2015. 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), 2015. 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=2015.

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), 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX

@misc{environmental_counties_in_florida_by_2015,
  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), 2015}},
  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=2015. 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), 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/florida-counties?period=2015.
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 100% in 2015, according to EPA.

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

Hillsborough County, with 44.1% in 2015.

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 2015 and are not ranked.