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

Median Air Quality Index (US EPA) in Codington County

Median Air Quality Index (US EPA) in Codington County was 35 in 2025, according to the U.S. Environmental Protection Agency. That is down 2 from 2024. That is the 6th highest of 10 counties in 2025.

2025, index35
Change on 2024-2
Rank6th of 10Counties in South Dakota ranked
Series high522012
Series low202011

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Median Air Quality Index (US EPA) in Codington County, 2003 to 2025

20304050602003200720112015201920252003: 46 index2004: 50 index2005: 48 index2006: 24 index2007: 26 index2008: 24 index2009: 22 index2010: 23 index2011: 20 index2012: 52 index2013: 48 index2014: 23 index2015: 34 index2016: 28 index2017: 39 index2018: 39 index2019: 32 index2020: 38 index2021: 43 index2022: 41 index2023: 45 index2024: 37 index2025: 35 index203040506020032011201920252003: 46 index2004: 50 index2005: 48 index2006: 24 index2007: 26 index2008: 24 index2009: 22 index2010: 23 index2011: 20 index2012: 52 index2013: 48 index2014: 23 index2015: 34 index2016: 28 index2017: 39 index2018: 39 index2019: 32 index2020: 38 index2021: 43 index2022: 41 index2023: 45 index2024: 37 index2025: 35 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 23 values
Periodindex
202535
202437
202345
202241
202143
202038
201932
201839
201739
201628
201534
201423
201348
201252
201120
201023
200922
200824
200726
200624
200548
200450
200346

Codington County compared with nearby places

Brookings County: 46 indexBrown County: 27 indexClay County: 34 indexCodington County: 35 indexCuster County: 45 indexHughes County: 18 indexJackson County: 43 indexMeade County: 36 indexMinnehaha County: 36 indexPennington County: 32 index
  • Under 31
  • 31 to 35
  • 35 to 36
  • 36 to 43
  • 43 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Codington 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), Codington County, 2003 to 2025) [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), Codington County, 2003 to 2025. 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/codington-county-south-dakota. 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), Codington County, 2003 to 2025. 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/codington-county-south-dakota.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Codington County, 2003 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/codington-county-south-dakota (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Codington County, 2003 to 2025}},
  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/codington-county-south-dakota. 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), Codington County, 2003 to 2025
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/codington-county-south-dakota
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/codington-county-south-dakota.
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 Codington County?

Median Air Quality Index (US EPA) in Codington County was 35 in 2025, according to the U.S. Environmental Protection Agency. That is down 2 from 2024. That is the 6th highest of 10 counties in 2025.

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 Codington County?

52 in 2012, the highest value since 2003 in this series.

Related statistics for Codington County

All statistics for Codington County | Codington County in figures