Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in Wyoming

Counties in Wyoming by share of days with good air quality (US EPA AQI)

Weston County had the highest share of days with good air quality (US EPA AQI) of 19 counties in 2012, at 100%. Campbell County had the lowest, at 35%. The median was 76.3%. Source: EPA.

Keep it in a collection in your library.
Highest100Weston County
Lowest35Campbell County
Median76.319 counties

Map of counties, 2012

Albany County: 48.2 %Big Horn County: 97.8 %Campbell County: 35 %Carbon County: 76.3 %Converse County: 82.2 %Crook County: 40.5 %Fremont County: 58.5 %Johnson County: 92.3 %Laramie County: 61.5 %Lincoln County: 86.1 %Natrona County: 84.1 %Park County: 86.2 %Platte County: 93.4 %Sheridan County: 85.8 %Sublette County: 51.9 %Sweetwater County: 57.4 %Teton County: 68.9 %Uinta County: 69.4 %Weston County: 100 %
  • Under 55
  • 55 to 69
  • 69 to 84
  • 84 to 89
  • 89 and over
  • No data
%, 2012. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2012

Weston County: 100 %Weston County100Big Horn County: 97.8 %Big Horn County97.8Platte County: 93.4 %Platte County93.4Johnson County: 92.3 %Johnson County92.3Park County: 86.2 %Park County86.2Lincoln County: 86.1 %Lincoln County86.1Sheridan County: 85.8 %Sheridan County85.8Natrona County: 84.1 %Natrona County84.1Converse County: 82.2 %Converse County82.2Carbon County: 76.3 %Carbon County76.3Uinta County: 69.4 %Uinta County69.4Teton County: 68.9 %Teton County68.9Laramie County: 61.5 %Laramie County61.5Fremont County: 58.5 %Fremont County58.5Sweetwater County: 57.4 %Sweetwater County57.4Sublette County: 51.9 %Sublette County51.9Albany County: 48.2 %Albany County48.2Crook County: 40.5 %Crook County40.5Campbell County: 35 %Campbell County35Weston County: 100 %Weston County100Big Horn County: 97.8 %Big Horn County97.8Platte County: 93.4 %Platte County93.4Johnson County: 92.3 %Johnson County92.3Park County: 86.2 %Park County86.2Lincoln County: 86.1 %Lincoln County86.1Sheridan County: 85.8 %Sheridan County85.8Natrona County: 84.1 %Natrona County84.1Converse County: 82.2 %Converse County82.2Carbon County: 76.3 %Carbon County76.3Uinta County: 69.4 %Uinta County69.4Teton County: 68.9 %Teton County68.9Laramie County: 61.5 %Laramie County61.5Fremont County: 58.5 %Fremont County58.5Sweetwater County: 57.4 %Sweetwater County57.4Sublette County: 51.9 %Sublette County51.9Albany County: 48.2 %Albany County48.2Crook County: 40.5 %Crook County40.5Campbell County: 35 %Campbell County35
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2012 (%)Change on 2011
1Weston County100n/a
2Big Horn County97.8-0.5 pts
3Platte County93.4-1.7 pts
4Johnson County92.3-5.8 pts
5Park County86.2-6.4 pts
6Lincoln County86.1-7.3 pts
7Sheridan County85.8-4.5 pts
8Natrona County84.1+1.1 pts
9Converse County82.2-10.9 pts
10Carbon County76.3-1.6 pts
11Uinta County69.4-18.8 pts
12Teton County68.9-4.8 pts
13Laramie County61.5-8.6 pts
14Fremont County58.5+3.4 pts
15Sweetwater County57.4-5.3 pts
16Sublette County51.9-1.3 pts
17Albany County48.2-14.8 pts
18Crook County40.5-53.6 pts
19Campbell County35-19 pts

Other periods

About this ranking

Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.

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 2012 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: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts (Counties in Wyoming by share of days with good air quality (US EPA AQI), 2012) [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: good days as a share of days with an AQI, calculated with stored counts, Counties in Wyoming by share of days with good air quality (US EPA AQI), 2012. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/good-air-quality-days-share/wyoming-counties?period=2012. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Counties in Wyoming by share of days with good air quality (US EPA AQI), 2012. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/good-air-quality-days-share/wyoming-counties?period=2012.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in Wyoming by share of days with good air quality (US EPA AQI), 2012 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/wyoming-counties?period=2012 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_wyoming_by_2012,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in Wyoming by share of days with good air quality (US EPA AQI), 2012}},
  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/good-air-quality-days-share/wyoming-counties?period=2012. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts: Counties in Wyoming by share of days with good air quality (US EPA AQI), 2012
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/good-air-quality-days-share/wyoming-counties?period=2012
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/wyoming-counties?period=2012.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Wyoming by share of days with good air quality (US EPA AQI) using official data, and cite the source.
rank_places {"indicator":"aqi_good_days_share","level":"province","within":"Wyoming","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=aqi_good_days_share&level=province&within=Wyoming&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest share of days with good air quality (US EPA AQI)?

Weston County, with 100% in 2012, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

Campbell County, with 35% in 2012.

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: good days as a share of days with an AQI, calculated with stored counts. Retrieved 2026-10-12. 2 counties have no value for 2012 and are not ranked.

Share of days with good air quality (US EPA AQI): other rankings

Counties in Wyoming: more rankings