Data / Median Air Quality Index (US EPA) / Gillespie County

Median Air Quality Index (US EPA) in Gillespie County

Median Air Quality Index (US EPA) in Gillespie County was 44 in 2011, according to the U.S. Environmental Protection Agency.

2011, index44

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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Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

All 1 values
Periodindex
201144

Gillespie County compared with nearby places

Bell County: 42 indexBexar County: 53 indexBowie County: 53 indexBrazoria County: 36 indexBrewster County: 47 indexCameron County: 52 indexCollin County: 41 indexCulberson County: 28 indexDallas County: 57 indexDenton County: 52 indexEctor County: 51 indexEllis County: 52 indexEl Paso County: 64 indexFayette County: 39 indexGalveston County: 50 indexGillespie County: 44 indexGregg County: 39 indexHarris County: 60 indexHarrison County: 54 indexHays County: 44 indexHidalgo County: 52 indexHood County: 39 indexHunt County: 39 indexJefferson County: 53 indexJohnson County: 38 indexKaufman County: 52 indexKleberg County: 52 indexLubbock County: 42 indexMcLennan County: 49 indexMaverick County: 46 indexMontgomery County: 51 indexNavarro County: 52 indexNueces County: 47 indexOrange County: 47 indexParker County: 43 indexPolk County: 39 indexPotter County: 34 indexRandall County: 45 indexRockwall County: 40 indexSmith County: 42 indexTarrant County: 57 indexTravis County: 52 indexVictoria County: 32 indexWebb County: 52 indexWichita County: 38 index
  • Under 39
  • 39 to 42
  • 42 to 47
  • 47 to 52
  • 52 to 53
  • 53 and over
  • No data
Median Air Quality Index (US EPA), 2011, index. Gillespie 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

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.

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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 (Median Air Quality Index (US EPA), Gillespie County, 2011) [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, Median Air Quality Index (US EPA), Gillespie County, 2011. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/median-air-quality-index/gillespie-county-texas. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), Gillespie County, 2011. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/median-air-quality-index/gillespie-county-texas.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Gillespie County, 2011 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/gillespie-county-texas (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2011,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Gillespie County, 2011}},
  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/median-air-quality-index/gillespie-county-texas. 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: Median Air Quality Index (US EPA), Gillespie County, 2011
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/median-air-quality-index/gillespie-county-texas
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/gillespie-county-texas.
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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Questions

What is the median Air Quality Index (US EPA) in Gillespie County?

Median Air Quality Index (US EPA) in Gillespie County was 44 in 2011, according to the U.S. Environmental Protection Agency.

Where does this figure come from?

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

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