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

Median Air Quality Index (US EPA) in Pennington County

Median Air Quality Index (US EPA) in Pennington County was 32 in 2025, according to the U.S. Environmental Protection Agency. That is down 4 from 2024. That is the 8th highest of 10 counties in 2025.

2025, index32
Change on 2024-4
Rank8th of 10Counties in South Dakota ranked
Series high512015
Series low211989

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

Get an email when a new figure is out or this one is revised.
Keep it in a collection in your library.

Median Air Quality Index (US EPA) in Pennington County, 1985 to 2025

203040506019851991199720032009201520251985: 33 index1986: 24 index1987: 27 index1988: 24 index1989: 21 index1990: 25 index1991: 21 index1992: 27 index1993: 22 index1994: 36 index1995: 34 index1996: 34 index1997: 35 index1998: 26 index1999: 42 index2000: 42 index2001: 37 index2002: 45 index2003: 45 index2004: 45 index2005: 44 index2006: 44 index2007: 35 index2008: 32 index2009: 37 index2010: 33 index2011: 33 index2012: 38 index2013: 44 index2014: 38 index2015: 51 index2016: 33 index2017: 37 index2018: 36 index2019: 33 index2020: 35 index2021: 39 index2022: 40 index2023: 45 index2024: 36 index2025: 32 index203040506019851999201320251985: 33 index1986: 24 index1987: 27 index1988: 24 index1989: 21 index1990: 25 index1991: 21 index1992: 27 index1993: 22 index1994: 36 index1995: 34 index1996: 34 index1997: 35 index1998: 26 index1999: 42 index2000: 42 index2001: 37 index2002: 45 index2003: 45 index2004: 45 index2005: 44 index2006: 44 index2007: 35 index2008: 32 index2009: 37 index2010: 33 index2011: 33 index2012: 38 index2013: 44 index2014: 38 index2015: 51 index2016: 33 index2017: 37 index2018: 36 index2019: 33 index2020: 35 index2021: 39 index2022: 40 index2023: 45 index2024: 36 index2025: 32 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 41 values
Periodindex
202532
202436
202345
202240
202139
202035
201933
201836
201737
201633
201551
201438
201344
201238
201133
201033
200937
200832
200735
200644
200544
200445
200345
200245
200137
200042
199942
199826
199735
199634
199534
199436
199322
199227
199121
199025
198921
198824
198727
198624
198533

Pennington 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. Pennington 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.

Report a problem with this figure

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), Pennington County, 1985 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), Pennington County, 1985 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/pennington-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), Pennington County, 1985 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/pennington-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), Pennington County, 1985 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/pennington-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), Pennington County, 1985 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/pennington-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), Pennington County, 1985 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/pennington-county-south-dakota
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/pennington-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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest median Air Quality Index (US EPA) in Pennington County? Cite the source.
get_value {"indicator":"aqi_median","place":"us-county-46103"}
GET https://invokely.ai/api/v1/value?indicator=aqi_median&place=us-county-46103

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

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

Median Air Quality Index (US EPA) in Pennington County was 32 in 2025, according to the U.S. Environmental Protection Agency. That is down 4 from 2024. That is the 8th 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 Pennington County?

51 in 2015, the highest value since 1985 in this series.

Related statistics for Pennington County

All statistics for Pennington County | Pennington County in figures