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)

Dewey County had the highest share of days with good air quality (US EPA AQI) of 25 counties in 2002, at 86.1%. Tulsa County had the lowest, at 30.1%. The median was 68.7%. Source: EPA.

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Highest86.1Dewey County
Lowest30.1Tulsa County
Median68.725 counties

Map of counties, 2002

Adair County: 72.6 %Caddo County: 64.3 %Canadian County: 73.6 %Carter County: 63.6 %Cherokee County: 75.1 %Cleveland County: 80.2 %Comanche County: 71.2 %Custer County: 65.7 %Dewey County: 86.1 %Ellis County: 72.7 %Garfield County: 57.5 %Jefferson County: 68.8 %Kay County: 65.8 %Lincoln County: 62.5 %McClain County: 79.7 %Marshall County: 68.7 %Mayes County: 41.7 %Muskogee County: 73.4 %Oklahoma County: 43 %Ottawa County: 74.1 %Pawnee County: 77.6 %Payne County: 56.7 %Pittsburg County: 60.4 %Seminole County: 60.3 %Tulsa County: 30.1 %
  • Under 60
  • 60 to 65
  • 65 to 72
  • 72 to 74
  • 74 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

Dewey County: 86.1 %Dewey County86.1Cleveland County: 80.2 %Cleveland County80.2McClain County: 79.7 %McClain County79.7Pawnee County: 77.6 %Pawnee County77.6Cherokee County: 75.1 %Cherokee County75.1Ottawa County: 74.1 %Ottawa County74.1Canadian County: 73.6 %Canadian County73.6Muskogee County: 73.4 %Muskogee County73.4Ellis County: 72.7 %Ellis County72.7Adair County: 72.6 %Adair County72.6Comanche County: 71.2 %Comanche County71.2Jefferson County: 68.8 %Jefferson County68.8Marshall County: 68.7 %Marshall County68.7Kay County: 65.8 %Kay County65.8Custer County: 65.7 %Custer County65.7Caddo County: 64.3 %Caddo County64.3Carter County: 63.6 %Carter County63.6Lincoln County: 62.5 %Lincoln County62.5Pittsburg County: 60.4 %Pittsburg County60.4Seminole County: 60.3 %Seminole County60.3Garfield County: 57.5 %Garfield County57.5Payne County: 56.7 %Payne County56.7Oklahoma County: 43 %Oklahoma County43Mayes County: 41.7 %Mayes County41.7Tulsa County: 30.1 %Tulsa County30.1Dewey County: 86.1 %Dewey County86.1Cleveland County: 80.2 %Cleveland County80.2McClain County: 79.7 %McClain County79.7Pawnee County: 77.6 %Pawnee County77.6Cherokee County: 75.1 %Cherokee County75.1Ottawa County: 74.1 %Ottawa County74.1Canadian County: 73.6 %Canadian County73.6Muskogee County: 73.4 %Muskogee County73.4Ellis County: 72.7 %Ellis County72.7Adair County: 72.6 %Adair County72.6Comanche County: 71.2 %Comanche County71.2Jefferson County: 68.8 %Jefferson County68.8Marshall County: 68.7 %Marshall County68.7Kay County: 65.8 %Kay County65.8Custer County: 65.7 %Custer County65.7Caddo County: 64.3 %Caddo County64.3Carter County: 63.6 %Carter County63.6Lincoln County: 62.5 %Lincoln County62.5Pittsburg County: 60.4 %Pittsburg County60.4Seminole County: 60.3 %Seminole County60.3Garfield County: 57.5 %Garfield County57.5Payne County: 56.7 %Payne County56.7Oklahoma County: 43 %Oklahoma County43Mayes County: 41.7 %Mayes County41.7Tulsa County: 30.1 %Tulsa County30.1
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2002 (%)Change on 2001
1Dewey County86.1n/a
2Cleveland County80.2+8.5 pts
3McClain County79.7+6.3 pts
4Pawnee County77.6+16.9 pts
5Cherokee County75.1+4.7 pts
6Ottawa County74.1+9.2 pts
7Canadian County73.6+21 pts
8Muskogee County73.4-5.2 pts
9Ellis County72.7n/a
10Adair County72.6n/a
11Comanche County71.2+6 pts
12Jefferson County68.8+12 pts
13Marshall County68.7+5.6 pts
14Kay County65.8+7.2 pts
15Custer County65.7-4.6 pts
16Caddo County64.3+2.9 pts
17Carter County63.6+11.6 pts
18Lincoln County62.5+11.6 pts
19Pittsburg County60.4+17.4 pts
20Seminole County60.3+6.1 pts
21Garfield County57.5-9.9 pts
22Payne County56.70 pts
23Oklahoma County43+9.8 pts
24Mayes County41.7-13.2 pts
25Tulsa County30.1+9.6 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 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 Oklahoma 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 Oklahoma 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/oklahoma-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 Oklahoma 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/oklahoma-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 Oklahoma 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/oklahoma-counties?period=2002 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_oklahoma_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 Oklahoma 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/oklahoma-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 Oklahoma 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/oklahoma-counties?period=2002
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/oklahoma-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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Questions

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

Dewey County, with 86.1% in 2002, according to EPA.

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

Tulsa County, with 30.1% 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. 20 counties have no value for 2002 and are not ranked.

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

Counties in Oklahoma: more rankings