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 27 counties in 2017, at 100%. Tulsa County had the lowest, at 37.8%. The median was 84.1%. Source: EPA.

Keep it in a collection in your library.
Highest100Grady County
Lowest37.8Tulsa County
Median84.127 counties

Map of counties, 2017

Adair County: 65.7 %Bryan County: 89.1 %Caddo County: 96.4 %Canadian County: 84.8 %Carter County: 63.5 %Cherokee County: 93.2 %Choctaw County: 94.8 %Cleveland County: 59.4 %Comanche County: 68.2 %Creek County: 88.7 %Custer County: 99 %Dewey County: 73.2 %Grady County: 100 %Jefferson County: 84.1 %Kay County: 41.4 %Lincoln County: 94.1 %Love County: 75.2 %McClain County: 84.9 %Mayes County: 91.6 %Muskogee County: 98.1 %Oklahoma County: 48.8 %Osage County: 88.3 %Ottawa County: 47.9 %Pittsburg County: 65.3 %Sequoyah County: 83.2 %Tulsa County: 37.8 %Washington County: 57.8 %
  • Under 60
  • 60 to 74
  • 74 to 87
  • 87 to 94
  • 94 and over
  • No data
%, 2017. 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, 2017

Grady County: 100 %Grady County100Custer County: 99 %Custer County99Muskogee County: 98.1 %Muskogee County98.1Caddo County: 96.4 %Caddo County96.4Choctaw County: 94.8 %Choctaw County94.8Lincoln County: 94.1 %Lincoln County94.1Cherokee County: 93.2 %Cherokee County93.2Mayes County: 91.6 %Mayes County91.6Bryan County: 89.1 %Bryan County89.1Creek County: 88.7 %Creek County88.7Osage County: 88.3 %Osage County88.3McClain County: 84.9 %McClain County84.9Canadian County: 84.8 %Canadian County84.8Jefferson County: 84.1 %Jefferson County84.1Sequoyah County: 83.2 %Sequoyah County83.2Love County: 75.2 %Love County75.2Dewey County: 73.2 %Dewey County73.2Comanche County: 68.2 %Comanche County68.2Adair County: 65.7 %Adair County65.7Pittsburg County: 65.3 %Pittsburg County65.3Carter County: 63.5 %Carter County63.5Cleveland County: 59.4 %Cleveland County59.4Washington County: 57.8 %Washington County57.8Oklahoma County: 48.8 %Oklahoma County48.8Ottawa County: 47.9 %Ottawa County47.9Kay County: 41.4 %Kay County41.4Tulsa County: 37.8 %Tulsa County37.8Grady County: 100 %Grady County100Custer County: 99 %Custer County99Muskogee County: 98.1 %Muskogee County98.1Caddo County: 96.4 %Caddo County96.4Choctaw County: 94.8 %Choctaw County94.8Lincoln County: 94.1 %Lincoln County94.1Cherokee County: 93.2 %Cherokee County93.2Mayes County: 91.6 %Mayes County91.6Bryan County: 89.1 %Bryan County89.1Creek County: 88.7 %Creek County88.7Osage County: 88.3 %Osage County88.3McClain County: 84.9 %McClain County84.9Canadian County: 84.8 %Canadian County84.8Jefferson County: 84.1 %Jefferson County84.1Sequoyah County: 83.2 %Sequoyah County83.2Love County: 75.2 %Love County75.2Dewey County: 73.2 %Dewey County73.2Comanche County: 68.2 %Comanche County68.2Adair County: 65.7 %Adair County65.7Pittsburg County: 65.3 %Pittsburg County65.3Carter County: 63.5 %Carter County63.5Cleveland County: 59.4 %Cleveland County59.4Washington County: 57.8 %Washington County57.8Oklahoma County: 48.8 %Oklahoma County48.8Ottawa County: 47.9 %Ottawa County47.9Kay County: 41.4 %Kay County41.4Tulsa County: 37.8 %Tulsa County37.8
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Grady County1000 pts
2Custer County99-0.2 pts
3Muskogee County98.1-0.5 pts
4Caddo County96.4-1.4 pts
5Choctaw County94.8n/a
6Lincoln County94.1+11.6 pts
7Cherokee County93.2+0.3 pts
8Mayes County91.6+1.8 pts
9Bryan County89.1n/a
10Creek County88.7-1.4 pts
11Osage County88.3+0.9 pts
12McClain County84.9-7.6 pts
13Canadian County84.8-8.2 pts
14Jefferson County84.1n/a
15Sequoyah County83.2-0.7 pts
16Love County75.2n/a
17Dewey County73.2-4.4 pts
18Comanche County68.2-7.5 pts
19Adair County65.7-8.3 pts
20Pittsburg County65.3-5.2 pts
21Carter County63.5-17.4 pts
22Cleveland County59.4-9.4 pts
23Washington County57.8-7.5 pts
24Oklahoma County48.8-11.6 pts
25Ottawa County47.9-8.4 pts
26Kay County41.4-4.3 pts
27Tulsa County37.8-5.4 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. 18 counties with data in other periods have no value for 2017 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), 2017) [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), 2017. 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=2017. 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), 2017. 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=2017.

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), 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_oklahoma_by_2017,
  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), 2017}},
  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=2017. 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), 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/oklahoma-counties?period=2017.
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 2017, according to EPA.

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

Tulsa County, with 37.8% in 2017.

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. 18 counties have no value for 2017 and are not ranked.

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

Counties in Oklahoma: more rankings