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

Median Air Quality Index (US EPA) in Davis County

Median Air Quality Index (US EPA) in Davis County was 46 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024. That is the 5th highest of 17 counties in 2025.

2025, index46
Change on 20240
Rank5th of 17Counties in Utah ranked
Series high512017
Series low381983

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 Davis County, 1980 to 2025

354045505519801987199420012008201520251980: 47 index1981: 47 index1982: 47 index1983: 38 index1984: 44 index1985: 42 index1986: 43 index1987: 44 index1988: 42 index1989: 46 index1990: 45 index1991: 43 index1992: 44 index1993: 44 index1994: 45 index1995: 43 index1996: 45 index1997: 45 index1998: 44 index1999: 46 index2000: 44 index2001: 46 index2002: 46 index2003: 44 index2004: 46 index2005: 44 index2006: 45 index2007: 47 index2008: 46 index2009: 44 index2010: 40 index2011: 40 index2012: 41 index2013: 42 index2014: 44 index2015: 39 index2016: 47 index2017: 51 index2018: 49 index2019: 45 index2020: 46 index2021: 47 index2022: 47 index2023: 47 index2024: 46 index2025: 46 index354045505519801996201220251980: 47 index1981: 47 index1982: 47 index1983: 38 index1984: 44 index1985: 42 index1986: 43 index1987: 44 index1988: 42 index1989: 46 index1990: 45 index1991: 43 index1992: 44 index1993: 44 index1994: 45 index1995: 43 index1996: 45 index1997: 45 index1998: 44 index1999: 46 index2000: 44 index2001: 46 index2002: 46 index2003: 44 index2004: 46 index2005: 44 index2006: 45 index2007: 47 index2008: 46 index2009: 44 index2010: 40 index2011: 40 index2012: 41 index2013: 42 index2014: 44 index2015: 39 index2016: 47 index2017: 51 index2018: 49 index2019: 45 index2020: 46 index2021: 47 index2022: 47 index2023: 47 index2024: 46 index2025: 46 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Periodindex
202546
202446
202347
202247
202147
202046
201945
201849
201751
201647
201539
201444
201342
201241
201140
201040
200944
200846
200747
200645
200544
200446
200344
200246
200146
200044
199946
199844
199745
199645
199543
199445
199344
199244
199143
199045
198946
198842
198744
198643
198542
198444
198338
198247
198147
198047

Davis 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. Davis 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), Davis County, 1980 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), Davis County, 1980 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/davis-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), Davis County, 1980 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/davis-county-utah.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Davis County, 1980 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/davis-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), Davis County, 1980 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/davis-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), Davis County, 1980 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/davis-county-utah
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/davis-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 Davis County?

Median Air Quality Index (US EPA) in Davis County was 46 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024. That is the 5th 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 Davis County?

51 in 2017, the highest value since 1980 in this series.

Related statistics for Davis County

All statistics for Davis County | Davis County in figures