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

Median Air Quality Index (US EPA) in Garfield County

Median Air Quality Index (US EPA) in Garfield County was 12 in 2025, according to the U.S. Environmental Protection Agency. That is up 3 from 2024. That is the 17th highest of 17 counties in 2025.

2025, index12
Change on 2024+3
Rank17th of 17Counties in Utah ranked
Series high452021
Series low92024

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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Median Air Quality Index (US EPA) in Garfield County, 1988 to 2025

0102030405019881994200020062012201820251988: 19 index1989: 18 index1990: 16 index1991: 17 index1992: 16 index1993: 17 index1994: 19 index1995: 14 index1996: 16 index1997: 14 index1998: 13 index1999: 15 index2000: 12 index2001: 14 index2002: 11 index2003: 12 index2004: 12 index2005: 11 index2006: 13 index2007: 15 index2008: 13 index2009: 12 index2010: 11 index2011: 12 index2012: 42 index2013: 40 index2014: 42 index2015: 42 index2016: 11 index2017: 44 index2018: 44 index2019: 41 index2020: 42 index2021: 45 index2022: 44 index2023: 10 index2024: 9 index2025: 12 index0102030405019882001201420251988: 19 index1989: 18 index1990: 16 index1991: 17 index1992: 16 index1993: 17 index1994: 19 index1995: 14 index1996: 16 index1997: 14 index1998: 13 index1999: 15 index2000: 12 index2001: 14 index2002: 11 index2003: 12 index2004: 12 index2005: 11 index2006: 13 index2007: 15 index2008: 13 index2009: 12 index2010: 11 index2011: 12 index2012: 42 index2013: 40 index2014: 42 index2015: 42 index2016: 11 index2017: 44 index2018: 44 index2019: 41 index2020: 42 index2021: 45 index2022: 44 index2023: 10 index2024: 9 index2025: 12 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 38 values
Periodindex
202512
20249
202310
202244
202145
202042
201941
201844
201744
201611
201542
201442
201340
201242
201112
201011
200912
200813
200715
200613
200511
200412
200312
200211
200114
200012
199915
199813
199714
199616
199514
199419
199317
199216
199117
199016
198918
198819

Garfield County compared with nearby places

Box Elder County: 45 indexCache County: 44 indexCarbon County: 44 indexDavis County: 46 indexDuchesne County: 46 indexGarfield County: 12 indexGrand County: 47 indexIron County: 44 indexSalt Lake County: 57 indexSan Juan County: 44 indexTooele County: 44 indexUintah County: 48 indexUtah County: 48 indexWasatch County: 45 indexWashington County: 44 indexWayne County: 14 indexWeber County: 45 index
  • Under 44
  • 44 to 45
  • 45 to 47
  • 47 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Garfield 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), Garfield County, 1988 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: median daily AQI, Median Air Quality Index (US EPA), Garfield County, 1988 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/median-air-quality-index/garfield-county-utah. 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), Garfield County, 1988 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/median-air-quality-index/garfield-county-utah.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Garfield County, 1988 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/garfield-county-utah (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Garfield County, 1988 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/median-air-quality-index/garfield-county-utah. 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), Garfield County, 1988 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/median-air-quality-index/garfield-county-utah
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/garfield-county-utah.
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 Garfield County?

Median Air Quality Index (US EPA) in Garfield County was 12 in 2025, according to the U.S. Environmental Protection Agency. That is up 3 from 2024. That is the 17th highest of 17 counties in 2025.

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.

What was the highest median Air Quality Index (US EPA) in Garfield County?

45 in 2021, the highest value since 1988 in this series.

Related statistics for Garfield County

All statistics for Garfield County | Garfield County in figures