Data / Rankings / Median Air Quality Index (US EPA) / Counties in Wyoming

Counties in Wyoming by median Air Quality Index (US EPA)

Albany County had the highest median Air Quality Index (US EPA) of 19 counties in 2014, at 46. Johnson County had the lowest, at 8. The median was 42. Source: the U.S. Environmental Protection Agency.

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Highest46Albany County
Lowest8Johnson County
Median4219 counties

Map of counties, 2014

Albany County: 46 indexBig Horn County: 41 indexCampbell County: 44 indexCarbon County: 42 indexConverse County: 42 indexFremont County: 45 indexGoshen County: 27 indexJohnson County: 8 indexLaramie County: 44 indexLincoln County: 14 indexNatrona County: 41 indexPark County: 16 indexPlatte County: 17 indexSheridan County: 38 indexSublette County: 46 indexSweetwater County: 46 indexTeton County: 42 indexUinta County: 42 indexWeston County: 41 index
  • Under 23
  • 23 to 41
  • 41 to 42
  • 42 to 44
  • 44 and over
  • No data
index, 2014. Hatched areas have no value for this period. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2014

Albany County: 46 indexAlbany County46Sublette County: 46 indexSublette County46Sweetwater County: 46 indexSweetwater County46Fremont County: 45 indexFremont County45Campbell County: 44 indexCampbell County44Laramie County: 44 indexLaramie County44Carbon County: 42 indexCarbon County42Converse County: 42 indexConverse County42Teton County: 42 indexTeton County42Uinta County: 42 indexUinta County42Big Horn County: 41 indexBig Horn County41Natrona County: 41 indexNatrona County41Weston County: 41 indexWeston County41Sheridan County: 38 indexSheridan County38Goshen County: 27 indexGoshen County27Platte County: 17 indexPlatte County17Park County: 16 indexPark County16Lincoln County: 14 indexLincoln County14Johnson County: 8 indexJohnson County8Albany County: 46 indexAlbany County46Sublette County: 46 indexSublette County46Sweetwater County: 46 indexSweetwater County46Fremont County: 45 indexFremont County45Campbell County: 44 indexCampbell County44Laramie County: 44 indexLaramie County44Carbon County: 42 indexCarbon County42Converse County: 42 indexConverse County42Teton County: 42 indexTeton County42Uinta County: 42 indexUinta County42Big Horn County: 41 indexBig Horn County41Natrona County: 41 indexNatrona County41Weston County: 41 indexWeston County41Sheridan County: 38 indexSheridan County38Goshen County: 27 indexGoshen County27Platte County: 17 indexPlatte County17Park County: 16 indexPark County16Lincoln County: 14 indexLincoln County14Johnson County: 8 indexJohnson County8
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties2014
index		Change on 2013
1Albany County46-1
1Sublette County460
1Sweetwater County46+1
4Fremont County45-1
5Campbell County44-4
5Laramie County44+1
7Carbon County42+4
7Converse County420
7Teton County42-2
7Uinta County42-2
11Big Horn County41+1
11Natrona County41-1
11Weston County41-3
14Sheridan County38-2
15Goshen County27n/a
16Platte County17+3
17Park County16-4
18Lincoln County14-5
19Johnson County8-1

Other periods

About this ranking

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.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 2 counties with data in other periods have no value for 2014 and are left out rather than filled from another source. Equal values share a rank.

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 (Counties in Wyoming by median Air Quality Index (US EPA), 2014) [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, Counties in Wyoming by median Air Quality Index (US EPA), 2014. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/median-air-quality-index/wyoming-counties?period=2014. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Counties in Wyoming by median Air Quality Index (US EPA), 2014. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/median-air-quality-index/wyoming-counties?period=2014.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Counties in Wyoming by median Air Quality Index (US EPA), 2014 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/median-air-quality-index/wyoming-counties?period=2014 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_wyoming_by_2014,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Counties in Wyoming by median Air Quality Index (US EPA), 2014}},
  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/rankings/median-air-quality-index/wyoming-counties?period=2014. 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: Counties in Wyoming by median Air Quality Index (US EPA), 2014
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/rankings/median-air-quality-index/wyoming-counties?period=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/wyoming-counties?period=2014.
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

Which county has the highest median Air Quality Index (US EPA)?

Albany County, with 46 in 2014, according to the U.S. Environmental Protection Agency.

Which county has the lowest median Air Quality Index (US EPA)?

Johnson County, with 8 in 2014.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12. 2 counties have no value for 2014 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Wyoming: more rankings