Data / Share of days with good air quality (US EPA AQI) / Marion County

Share of days with good air quality (US EPA AQI) in Marion County

Share of days with good air quality (US EPA AQI) in Marion County was 67.3% in 2025, according to EPA. That is up 14.8 pts from 2024. That is the 29th highest of 38 counties in 2025.

202567.3%
Change on 2024+14.8 pts
Rank29th of 38Counties in Florida ranked
Series high84.91998
Series low52.52024

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Share of days with good air quality (US EPA AQI) in Marion County, 1998 to 2025

5060708090199820022006201020142018202220251998: 84.9 %1999: 67.9 %2000: 62 %2001: 71 %2002: 74.5 %2003: 76.7 %2004: 70.5 %2005: 70.5 %2006: 71 %2007: 73.7 %2008: 56.6 %2009: 61.1 %2010: 53.4 %2011: 54 %2012: 57.1 %2013: 65.2 %2014: 61.4 %2015: 75.3 %2016: 69.4 %2017: 71.2 %2018: 74.8 %2019: 66.8 %2020: 62.6 %2021: 70.4 %2022: 71.3 %2023: 66 %2024: 52.5 %2025: 67.3 %50607080901998200820251998: 84.9 %1999: 67.9 %2000: 62 %2001: 71 %2002: 74.5 %2003: 76.7 %2004: 70.5 %2005: 70.5 %2006: 71 %2007: 73.7 %2008: 56.6 %2009: 61.1 %2010: 53.4 %2011: 54 %2012: 57.1 %2013: 65.2 %2014: 61.4 %2015: 75.3 %2016: 69.4 %2017: 71.2 %2018: 74.8 %2019: 66.8 %2020: 62.6 %2021: 70.4 %2022: 71.3 %2023: 66 %2024: 52.5 %2025: 67.3 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 28 values
Period%
202567.3
202452.5
202366
202271.3
202170.4
202062.6
201966.8
201874.8
201771.2
201669.4
201575.3
201461.4
201365.2
201257.1
201154
201053.4
200961.1
200856.6
200773.7
200671
200570.5
200470.5
200376.7
200274.5
200171
200062
199967.9
199884.9

Marion County compared with nearby places

Alachua County: 88.7 %Baker County: 69.5 %Bay County: 66.4 %Brevard County: 91.2 %Broward County: 73.4 %Citrus County: 71.1 %Collier County: 72.1 %Columbia County: 57.3 %Duval County: 47.9 %Escambia County: 73.7 %Flagler County: 98.1 %Hamilton County: 60.2 %Highlands County: 94.9 %Hillsborough County: 53.2 %Holmes County: 60 %Indian River County: 94.1 %Lake County: 95 %Lee County: 76.4 %Leon County: 56.4 %Liberty County: 98.5 %Manatee County: 91 %Marion County: 67.3 %Martin County: 79.5 %Miami-Dade County: 56.4 %Okaloosa County: 93.9 %Orange County: 72.9 %Osceola County: 83.6 %Palm Beach County: 76.4 %Pasco County: 92.6 %Pinellas County: 69.6 %Polk County: 95.5 %Putnam County: 95.6 %St. Lucie County: 96.4 %Santa Rosa County: 70.7 %Sarasota County: 64.7 %Seminole County: 84.6 %Volusia County: 81.4 %Wakulla County: 75.6 %
  • Under 61
  • 61 to 71
  • 71 to 76
  • 76 to 87
  • 87 to 95
  • 95 and over
  • No data
Share of days with good air quality (US EPA AQI), 2025, %. Marion County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

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.

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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 (Share of days with good air quality (US EPA AQI), Marion County, 1998 to 2025) [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, Share of days with good air quality (US EPA AQI), Marion County, 1998 to 2025. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/good-air-quality-days-share/marion-county-florida. 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. Share of days with good air quality (US EPA AQI), Marion County, 1998 to 2025. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/good-air-quality-days-share/marion-county-florida.

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, Share of days with good air quality (US EPA AQI), Marion County, 1998 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/marion-county-florida (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2025,
  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: Share of days with good air quality (US EPA AQI), Marion County, 1998 to 2025}},
  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/en/good-air-quality-days-share/marion-county-florida. 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: Share of days with good air quality (US EPA AQI), Marion County, 1998 to 2025
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/en/good-air-quality-days-share/marion-county-florida
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/marion-county-florida.
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

What is the share of days with good air quality (US EPA AQI) in Marion County?

Share of days with good air quality (US EPA AQI) in Marion County was 67.3% in 2025, according to EPA. That is up 14.8 pts from 2024. That is the 29th highest of 38 counties in 2025.

Where does this figure come from?

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 by Invokely on 2026-10-12.

What was the highest share of days with good air quality (US EPA AQI) in Marion County?

84.9% in 1998, the highest value since 1998 in this series.

Related statistics for Marion County

All statistics for Marion County | Marion County in figures