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

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

Montgomery County had the highest share of days with good air quality (US EPA AQI) of 15 counties in 2002, at 99.7%. Johnson County had the lowest, at 38.5%. The median was 65.9%. Source: EPA.

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Highest99.7Montgomery County
Lowest38.5Johnson County
Median65.915 counties

Map of counties, 2002

Brown County: 50.8 %Chase County: 77.8 %Ford County: 98.3 %Jefferson County: 52.1 %Johnson County: 38.5 %Linn County: 67.4 %Montgomery County: 99.7 %Neosho County: 98.3 %Riley County: 65.2 %Sedgwick County: 58.6 %Shawnee County: 41.8 %Sherman County: 85.5 %Sumner County: 65.9 %Trego County: 97.3 %Wyandotte County: 56.2 %
  • Under 52
  • 52 to 63
  • 63 to 72
  • 72 to 98
  • 98 and over
  • No data
%, 2002. 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, 2002

Montgomery County: 99.7 %Montgomery County99.7Ford County: 98.3 %Ford County98.3Neosho County: 98.3 %Neosho County98.3Trego County: 97.3 %Trego County97.3Sherman County: 85.5 %Sherman County85.5Chase County: 77.8 %Chase County77.8Linn County: 67.4 %Linn County67.4Sumner County: 65.9 %Sumner County65.9Riley County: 65.2 %Riley County65.2Sedgwick County: 58.6 %Sedgwick County58.6Wyandotte County: 56.2 %Wyandotte County56.2Jefferson County: 52.1 %Jefferson County52.1Brown County: 50.8 %Brown County50.8Shawnee County: 41.8 %Shawnee County41.8Johnson County: 38.5 %Johnson County38.5Montgomery County: 99.7 %Montgomery County99.7Ford County: 98.3 %Ford County98.3Neosho County: 98.3 %Neosho County98.3Trego County: 97.3 %Trego County97.3Sherman County: 85.5 %Sherman County85.5Chase County: 77.8 %Chase County77.8Linn County: 67.4 %Linn County67.4Sumner County: 65.9 %Sumner County65.9Riley County: 65.2 %Riley County65.2Sedgwick County: 58.6 %Sedgwick County58.6Wyandotte County: 56.2 %Wyandotte County56.2Jefferson County: 52.1 %Jefferson County52.1Brown County: 50.8 %Brown County50.8Shawnee County: 41.8 %Shawnee County41.8Johnson County: 38.5 %Johnson County38.5
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2002 (%)Change on 2001
1Montgomery County99.7-0.3 pts
2Ford County98.30 pts
2Neosho County98.3+0.1 pts
4Trego County97.3+20.6 pts
5Sherman County85.5-14.5 pts
6Chase County77.8n/a
7Linn County67.4+7.5 pts
8Sumner County65.9+7.3 pts
9Riley County65.2n/a
10Sedgwick County58.6+3.5 pts
11Wyandotte County56.2-6 pts
12Jefferson County52.1n/a
13Brown County50.8n/a
14Shawnee County41.8-1.2 pts
15Johnson County38.5+5.7 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. 8 counties with data in other periods have no value for 2002 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 Kansas by share of days with good air quality (US EPA AQI), 2002) [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 Kansas by share of days with good air quality (US EPA AQI), 2002. 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/kansas-counties?period=2002. 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 Kansas by share of days with good air quality (US EPA AQI), 2002. 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/kansas-counties?period=2002.

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 Kansas by share of days with good air quality (US EPA AQI), 2002 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/kansas-counties?period=2002 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_kansas_by_2002,
  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 Kansas by share of days with good air quality (US EPA AQI), 2002}},
  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/kansas-counties?period=2002. 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 Kansas by share of days with good air quality (US EPA AQI), 2002
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/kansas-counties?period=2002
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/kansas-counties?period=2002.
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  -
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Rank Counties in Kansas by share of days with good air quality (US EPA AQI) using official data, and cite the source.
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Questions

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

Montgomery County, with 99.7% in 2002, according to EPA.

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

Johnson County, with 38.5% in 2002.

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. 8 counties have no value for 2002 and are not ranked.

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

Counties in Kansas: more rankings