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

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

Grady County had the highest share of days with good air quality (US EPA AQI) of 25 counties in 2016, at 100%. Tulsa County had the lowest, at 43.2%. The median was 83.9%. Source: EPA.

Keep it in a collection in your library.
Highest100Grady County
Lowest43.2Tulsa County
Median83.925 counties

Map of counties, 2016

Adair County: 74 %Caddo County: 97.8 %Canadian County: 93 %Carter County: 80.9 %Cherokee County: 92.9 %Cleveland County: 68.8 %Comanche County: 75.7 %Cotton County: 89.8 %Creek County: 90.1 %Custer County: 99.2 %Dewey County: 77.6 %Grady County: 100 %Johnston County: 91.3 %Kay County: 45.7 %Lincoln County: 82.5 %McClain County: 92.5 %Mayes County: 89.8 %Muskogee County: 98.6 %Oklahoma County: 60.4 %Osage County: 87.4 %Ottawa County: 56.3 %Pittsburg County: 70.5 %Sequoyah County: 83.9 %Tulsa County: 43.2 %Washington County: 65.3 %
  • Under 68
  • 68 to 80
  • 80 to 90
  • 90 to 93
  • 93 and over
  • No data
%, 2016. 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, 2016

Grady County: 100 %Grady County100Custer County: 99.2 %Custer County99.2Muskogee County: 98.6 %Muskogee County98.6Caddo County: 97.8 %Caddo County97.8Canadian County: 93 %Canadian County93Cherokee County: 92.9 %Cherokee County92.9McClain County: 92.5 %McClain County92.5Johnston County: 91.3 %Johnston County91.3Creek County: 90.1 %Creek County90.1Cotton County: 89.8 %Cotton County89.8Mayes County: 89.8 %Mayes County89.8Osage County: 87.4 %Osage County87.4Sequoyah County: 83.9 %Sequoyah County83.9Lincoln County: 82.5 %Lincoln County82.5Carter County: 80.9 %Carter County80.9Dewey County: 77.6 %Dewey County77.6Comanche County: 75.7 %Comanche County75.7Adair County: 74 %Adair County74Pittsburg County: 70.5 %Pittsburg County70.5Cleveland County: 68.8 %Cleveland County68.8Washington County: 65.3 %Washington County65.3Oklahoma County: 60.4 %Oklahoma County60.4Ottawa County: 56.3 %Ottawa County56.3Kay County: 45.7 %Kay County45.7Tulsa County: 43.2 %Tulsa County43.2Grady County: 100 %Grady County100Custer County: 99.2 %Custer County99.2Muskogee County: 98.6 %Muskogee County98.6Caddo County: 97.8 %Caddo County97.8Canadian County: 93 %Canadian County93Cherokee County: 92.9 %Cherokee County92.9McClain County: 92.5 %McClain County92.5Johnston County: 91.3 %Johnston County91.3Creek County: 90.1 %Creek County90.1Cotton County: 89.8 %Cotton County89.8Mayes County: 89.8 %Mayes County89.8Osage County: 87.4 %Osage County87.4Sequoyah County: 83.9 %Sequoyah County83.9Lincoln County: 82.5 %Lincoln County82.5Carter County: 80.9 %Carter County80.9Dewey County: 77.6 %Dewey County77.6Comanche County: 75.7 %Comanche County75.7Adair County: 74 %Adair County74Pittsburg County: 70.5 %Pittsburg County70.5Cleveland County: 68.8 %Cleveland County68.8Washington County: 65.3 %Washington County65.3Oklahoma County: 60.4 %Oklahoma County60.4Ottawa County: 56.3 %Ottawa County56.3Kay County: 45.7 %Kay County45.7Tulsa County: 43.2 %Tulsa County43.2
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2016 (%)Change on 2015
1Grady County100n/a
2Custer County99.2-0.8 pts
3Muskogee County98.6+1.9 pts
4Caddo County97.8+1.2 pts
5Canadian County93+7.8 pts
6Cherokee County92.9+0.8 pts
7McClain County92.5+2.8 pts
8Johnston County91.3+2 pts
9Creek County90.1-2.2 pts
10Cotton County89.8+3.7 pts
10Mayes County89.8-2.5 pts
12Osage County87.4n/a
13Sequoyah County83.9+0.6 pts
14Lincoln County82.5+10.8 pts
15Carter County80.9n/a
16Dewey County77.6+4 pts
17Comanche County75.7+7.8 pts
18Adair County74+8.2 pts
19Pittsburg County70.5-0.7 pts
20Cleveland County68.8+8.4 pts
21Washington County65.3n/a
22Oklahoma County60.4+0.7 pts
23Ottawa County56.3+5.2 pts
24Kay County45.7+7.3 pts
25Tulsa County43.2-1.5 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. 20 counties with data in other periods have no value for 2016 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 Oklahoma by share of days with good air quality (US EPA AQI), 2016) [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 Oklahoma by share of days with good air quality (US EPA AQI), 2016. 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/oklahoma-counties?period=2016. 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 Oklahoma by share of days with good air quality (US EPA AQI), 2016. 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/oklahoma-counties?period=2016.

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 Oklahoma by share of days with good air quality (US EPA AQI), 2016 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/oklahoma-counties?period=2016 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_oklahoma_by_2016,
  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 Oklahoma by share of days with good air quality (US EPA AQI), 2016}},
  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/oklahoma-counties?period=2016. 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 Oklahoma by share of days with good air quality (US EPA AQI), 2016
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/oklahoma-counties?period=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/oklahoma-counties?period=2016.
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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Questions

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

Grady County, with 100% in 2016, according to EPA.

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

Tulsa County, with 43.2% in 2016.

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. 20 counties have no value for 2016 and are not ranked.

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

Counties in Oklahoma: more rankings