Data / Median Air Quality Index (US EPA) / Bryan County

Median Air Quality Index (US EPA) in Bryan County

Median Air Quality Index (US EPA) in Bryan County was 38 in 2018, according to the U.S. Environmental Protection Agency. That is down 1 from 2017. That is the 16th highest of 25 counties in 2018.

2018, index38
Change on 2017-1
Rank16th of 25Counties in Oklahoma ranked
Series high392014
Series low352013

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Median Air Quality Index (US EPA) in Bryan County, 2013 to 2018

353637383920132014201720182013: 35 index2014: 39 index2017: 39 index2018: 38 index3536373839201320182013: 35 index2014: 39 index2017: 39 index2018: 38 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 4 values
Periodindex
201838
201739
201439
201335

Bryan County compared with nearby places

Adair County: 42 indexBryan County: 38 indexCanadian County: 36 indexCarter County: 41 indexChoctaw County: 37 indexCleveland County: 52 indexComanche County: 44 indexCreek County: 36 indexCuster County: 16 indexDewey County: 47 indexJefferson County: 43 indexKay County: 51 indexLe Flore County: 34 indexLove County: 43 indexMcClain County: 38 indexMayes County: 37 indexMuskogee County: 19 indexNowata County: 48 indexOklahoma County: 52 indexOsage County: 36 indexOttawa County: 52 indexPittsburg County: 46 indexSequoyah County: 41 indexTulsa County: 56 indexWashington County: 53 index
  • Under 36
  • 36 to 40
  • 40 to 43
  • 43 to 51
  • 51 and over
  • No data
Median Air Quality Index (US EPA), 2018, index. Bryan County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

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.

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How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. 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: median daily AQI (Median Air Quality Index (US EPA), Bryan County, 2013 to 2018) [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: median daily AQI, Median Air Quality Index (US EPA), Bryan County, 2013 to 2018. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/median-air-quality-index/bryan-county-oklahoma. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), Bryan County, 2013 to 2018. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/median-air-quality-index/bryan-county-oklahoma.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Bryan County, 2013 to 2018 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/bryan-county-oklahoma (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2018,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Bryan County, 2013 to 2018}},
  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/en/median-air-quality-index/bryan-county-oklahoma. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. 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: median daily AQI: Median Air Quality Index (US EPA), Bryan County, 2013 to 2018
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/en/median-air-quality-index/bryan-county-oklahoma
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/bryan-county-oklahoma.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the median Air Quality Index (US EPA) in Bryan County?

Median Air Quality Index (US EPA) in Bryan County was 38 in 2018, according to the U.S. Environmental Protection Agency. That is down 1 from 2017. That is the 16th highest of 25 counties in 2018.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: median daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest median Air Quality Index (US EPA) in Bryan County?

39 in 2014, the highest value since 2013 in this series.

Related statistics for Bryan County

All statistics for Bryan County | Bryan County in figures