Data / Highest daily Air Quality Index (US EPA) / Gulf County

Highest daily Air Quality Index (US EPA) in Gulf County

Highest daily Air Quality Index (US EPA) in Gulf County was 55 in 1999, according to the U.S. Environmental Protection Agency. That is down 4 from 1998.

1999, index55
Change on 1998-4
Series high641995
Series low341994

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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Highest daily Air Quality Index (US EPA) in Gulf County, 1992 to 1999

304050607019921994199619991992: 57 index1993: 51 index1994: 34 index1995: 64 index1996: 52 index1997: 55 index1998: 59 index1999: 55 index30405060701992199519991992: 57 index1993: 51 index1994: 34 index1995: 64 index1996: 52 index1997: 55 index1998: 59 index1999: 55 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 8 values
Periodindex
199955
199859
199755
199652
199564
199434
199351
199257

Gulf County compared with nearby places

Alachua County: 147 indexBaker County: 126 indexBay County: 63 indexBrevard County: 156 indexBroward County: 188 indexCitrus County: 83 indexCollier County: 33 indexDuval County: 154 indexEscambia County: 182 indexGulf County: 55 indexHamilton County: 103 indexHillsborough County: 187 indexHolmes County: 129 indexLake County: 54 indexLee County: 156 indexLeon County: 159 indexLiberty County: 140 indexManatee County: 201 indexMarion County: 172 indexMiami-Dade County: 172 indexMonroe County: 49 indexNassau County: 54 indexOrange County: 177 indexOsceola County: 136 indexPalm Beach County: 151 indexPasco County: 177 indexPinellas County: 197 indexPolk County: 150 indexPutnam County: 41 indexSt. Lucie County: 133 indexSarasota County: 177 indexSeminole County: 159 indexVolusia County: 142 index
  • Under 58
  • 58 to 130
  • 130 to 150
  • 150 to 160
  • 160 to 180
  • 180 and over
  • No data
Highest daily Air Quality Index (US EPA), 1999, index. Gulf 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest 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: highest daily AQI (Highest daily Air Quality Index (US EPA), Gulf County, 1992 to 1999) [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: highest daily AQI, Highest daily Air Quality Index (US EPA), Gulf County, 1992 to 1999. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/gulf-county-florida. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), Gulf County, 1992 to 1999. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/gulf-county-florida.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Gulf County, 1992 to 1999 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/gulf-county-florida (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_1999,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Gulf County, 1992 to 1999}},
  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/highest-daily-air-quality-index/gulf-county-florida. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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: highest daily AQI: Highest daily Air Quality Index (US EPA), Gulf County, 1992 to 1999
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/highest-daily-air-quality-index/gulf-county-florida
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/gulf-county-florida.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the highest daily Air Quality Index (US EPA) in Gulf County?

Highest daily Air Quality Index (US EPA) in Gulf County was 55 in 1999, according to the U.S. Environmental Protection Agency. That is down 4 from 1998.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: highest daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest highest daily Air Quality Index (US EPA) in Gulf County?

64 in 1995, the highest value since 1992 in this series.

Related statistics for Gulf County

All statistics for Gulf County | Gulf County in figures